Rotzo Formation
| Rotzo Formation | |
|---|---|
| Stratigraphic range: Pliensbachian ~192.30–185.99 Ma [1] | |
| Panorama of the Rotzo area with several of the Outcrops visible: Tonezza mountain at the left, Val d ́Assa cliff in the center-front and Campolongo mountain in the right | |
| Type | Geological formation |
| Unit of | Calcari Grigi Group |
| Sub-units | Tovel Member[2] |
| Underlies | Massone Oolitic Limestone |
| Overlies | |
| Area | Trento Platform |
| Thickness | 250 m |
| Lithology | |
| Primary | Lithified gray silty marl, gray grainstone, bioturbated/intraclastic/ooidal gray wackestone, mud banks and sand deposits.[3] |
| Other | Light-grey to yellowish-grey packstone with oolites, bioclasts, algal lumps, pellets, dasycladacean algae, foraminifera, lituolids, and miliolids |
| Location | |
| Location | Vicenza Province: Trentino-Alto Adige, Southern Alps |
| Coordinates | 45°42′N 11°06′E / 45.7°N 11.1°E / 45.7; 11.1 |
| Approximate paleocoordinates | 32°06′S 16°42′E / 32.1°S 16.7°E / -32.1; 16.7 |
| Region | Veneto |
| Country | Italy |
| Type section | |
| Named for | Rotzo |
Rotzo Formation is located in Italy Rotzo Formation Rotzo Formation (Italy) | |
The Rotzo Formation (also known in older literature as the Noriglio Grey Limestone Formation) is a geological formation in Italy, dating to roughly between 192 and 185 million years ago and covering the Pliensbachian stage of the Jurassic Period in the Mesozoic Era.[4] Know mostly for being the main formation with recorded Plicatostylidae reefs, yet dinosaur tracks have been reported from the formation.[5]
Paleoenvironment
[edit ]
Has been traditionally classified as a Sinemurian-Pliensbachian Formation, but a large and detailed dataset of isotopic 13C and 87Sr/86Sr data, estimated the Rotzo Formation to span only over the Early Pliensbachian, bracketed between the Jamesoni-Davoei biozones, marked in the Loppio Oolitic Limestone-Rotzo Fm contact by a carbon isotope excursion onset similar to the Sinemu-Pliens boundary event, while the other sequences fit with the a warm phase that lasts until the Davoei biozone.[1] A more recent work reinforced this datation, constraining the lowermost levels to 192.30 Ma and the uppermost to 185.99 Ma.[6] The Rotzo Formation represented the Carbonate Platform, being located over the Trento Platform and surrounded by the Massone Oolite (marginal calcarenitic bodies), the Fanes Piccola Encrinite (condensed deposits and emerged lands), the Lombadian Basin Medolo Group and Belluno Basin Soverzene Formation (open marine), and finally towards the south, deep water deposits of the Adriatic Basin.[7] The Pliensbachian Podpeč Limestone of Slovenia, the Aganane Formation & the Calcaires du Bou Dahar of Morocco represent regional equivalents, both in deposition and faunal content.
This formation was deposited within a tropical lagoon environment, similar to modern Bahamas which was protected by oolitic shoals and bars from the open deep sea located to the east (Belluno Basin) and towards the west (Lombardia Basin). It is characterized by a rich paleontological content. It is notable mostly thanks to its great amount of big aberrant bivalves, among which is the genus Lithiotis , described in the second half of the nineteenth century. The unusual shape of Lithiotis and Cochlearites shells, extremely elongated and narrow, characterized by a spoon-like body space placed in a high position, rarely preserved, seems to suggest their adaptation to soft and muddy bottoms with a high sedimentation rate.[8] The Bellori outcrop displays about 20 m of limestones with intercalated clays and marls rich in organic matter and sometimes fossil wood (coal) and amber. The limestones are well stratified, with beds 10 cm to more than one metre thick, whereas the clayey levels range between 3 and 40 cm in thickness.[9] [10]
The sedimentary cover of the Southern Alps has been recognized as a well-preserved section of the Mesozoic Tethys' southern continental margin, featuring a horst and graben structure linked to the rifting associated with the opening of the central North Atlantic that in the Late Triassic and Early Jurassic, created elevated blocks separated by troughs. While the western margin (Piedmont and Lombardy) quickly submerged in the Early Jurassic (As seen by the Moltrasio Formation), the eastern regions maintained shallow water sedimentation, including the Friuli and Trento Platforms, this last one latter evolving into a pelagic plateau, and separated from the Lombardian basin by the Garda escarpment fault system.[11]
The Early Jurassic Calcari Grigi Group represents the shallow-water sedimentation phase of the Trento Platform, revealing several sites over an area of about 1,500 km2. The continuity of dinosaur tracks from the Hettangian-Pliensbachian interval indicates a stable connection between the Southern Alps' carbonate tidal flats and nearby vegetated lands and freshwater sources, although the exact locations of these lands remain uncertain.[12] Detailed sedimentological studies of the Calcari Grigi Group, particularly the Rotzo Formation, describe it as a shallow subtidal platform with an inner lagoon bordered by oolitic shoals.[9]
The Coste dell'Anglone ichnosite for example, situated on the margin of this lagoon within a sandy barrier complex, was influenced by pioneer plants like Hirmeriellaceae in semi-arid conditions. Sedimentary structures indicate a shallow water tidal environment with heterolithic stratification pointing to steady flows at low current velocities. The presence of dinosaur tracks and supratidal markers suggests repeated subaerial exposure, contrasting with previous interpretations of the site as fully subtidal.[12] [13]
These findings align with the lagoon-barrier island complex scenario, featuring a subtidal ramp gently inclined to the west and an intertidal-supratidal barrier island complex trending approximately N-S, now corresponding to the Mt. Brento-Biaina and Mt. Baldo chains.[7] [12]
Biota
[edit ]Amoebae
[edit ]| Color key Taxon
Reclassified taxon
Taxon falsely reported as present
Dubious taxon or junior synonym
Ichnotaxon
Ootaxon
Morphotaxon
|
Notes Uncertain or tentative taxa are in small text; |
The presence of the families Centropyxidae and Difflugiidae testifies the presence of a mixed marine-terrestrial depositional system, lacking large bodies of water.[14]
| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
Tonezza del Cimone |
Isolated Tests/Shells |
A testate amoebae, member of the family Centropyxidae inside Arcellinida. |
| |
|
Tonezza del Cimone |
Isolated Tests/Shells |
A testate amoebae, member of the family Difflugiidae inside Arcellinida. |
||
|
Tonezza del Cimone |
Isolated Tests/Shells |
A testate amoebae, member of the family Difflugiidae inside Arcellinida. |
_-_400x,_length_70%C2%B5m_(14739823660).jpg){kind=link}
Foranimifera
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Agerina [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Cornuspiridae family | |
| Ammobaculites [15] |
|
|
Isolated Tests/Shells | A foraminifer of the family Ammomarginulininae. | |
| Amijiella [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Hauraniidae family | |
| Bosniella [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Biokovinidae family | |
| Cymbriaella [16] |
|
|
Isolated Tests/Shells | A foraminifer of the Hauraniidae family | |
| Duotaxis [15] [17] |
|
|
Isolated Tests/Shells | A foraminifer of the Duotaxidae family | |
|
|
Isolated Tests/Shells | A foraminifer of the Everticyclamminidae family. | ||
| Frondicularia [19] |
|
|
Isolated Tests/Shells | A foraminifer of the family Nodosariinae. | |
| Glomospira [15] |
|
|
Isolated Tests/Shells | A foraminifer of the family Ammodiscidae. | |
| Haurania [15] |
|
|
Isolated Tests/Shells | A foraminifer of the family Hauraniinae. | |
| Kristanita [20] |
|
|
Isolated Tests/Shells | A foraminifer of the Duotaxidae family | |
| Lituosepta [15] [21] [22] |
|
|
Isolated Tests/Shells | A foraminifer of the Mesoendothyridae family. | |
| Meandrovoluta [15] [23] |
|
|
Isolated Tests/Shells | A foraminifer of the Cornuspiridae family | |
| Mayncina [19] [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Mayncinidae family | |
| Orbitopsella [19] [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Mesoendothyridae family. | |
| Ophtalmidium [15] |
|
|
Isolated Tests/Shells | A foraminifer of the family Ophthalmidiidae. | |
| Paleomayncina [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Planiseptinae family. | |
| Pseudocyclammina [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Pfenderinidae family. | |
| Pseudopfenderina [15] |
|
|
Isolated Tests/Shells | A foraminifer of the Pseudopfenderininae family. |
Sponges
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Bauneia [24] |
|
|
Imprints | A Demosponge, member of Chaetetidae. | |
|
|
Colonial Imprints |
A Demosponge, member of Suberitidae. Monospecific assamblages with encrusting and symbiont forms are found abundantly on lagoonal facies, distributed in several stratigraphic horizons. |
Anthozoa
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Colonial Imprints |
A Scleractinian Coral, member of Montlivaltiidae. This Coral is often found in the Early Jurassic Tethys range, from the Iberian peninsula to Morocco. |
||
| Montlivaltia [27] [28] |
|
|
Colonial Imprints | A Scleractinian Coral, member of Montlivaltiidae. | |
| Oppelismilia [19] |
|
|
Imprints | A Scleractinian Coral, member of Oppelismiliidae. | |
| Pinacophyllum [26] |
|
|
Colonial Imprints | A Scleractinian Coral, member of Stylophyllidae | |
| Stylophyllopsis [26] |
|
|
Colonial Imprints | A Scleractinian Coral, member of Stylophyllidae | |
| Synastrea [26] |
|
|
Colonial Imprints | A Scleractinian Coral, member of Synastraeidae |
Bryozoa
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Imprints |
A Stenolaematan of the family Aisenvergiidae |
Brachiopod
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Shells |
A Rhynchonellidan, member of Gibbirhynchiinae. Unusual genus in the Mediterranean region, more common on NW Europe |
||
| Hesperithyris [27] |
|
|
Shells | A Rhynchonellidan, member of Zeilleriidae. | |
|
|
Shells |
A Terebratulidan, member of Nucleatidae. Typical Mediterranean region taxon in the Pliensbachian |
||
|
|
Shells |
A spiriferidan, member of Spiriferinidae. |
||
| Liothyrina [28] |
|
|
Shells | A Terebratulidan, member of Terebratellidae. | |
| Lobothyris [27] |
|
|
Shells | A Terebratulidan, member of Lobothyrididae. | |
|
|
Shells |
A Terebratulidan, member of Plectoconchidae. The main Branchiopod locally associated with Lithiotid facies, where they formed rare mass occurrences. |
||
| Merophricus [27] |
|
|
Shells | A Terebratulidan, member of Plectoconchidae. | |
| Plectothyris [27] |
|
|
Shells | A Terebratulidan, member of Loboidothyrididae. | |
|
|
Shells |
A spiriferidan, member of Spiriferinidae. |
||
| Spiriferina [32] |
|
|
Shells | A spiriferidan, member of Spiriferinidae. | |
| Waldheimia [27] |
|
|
Shells | A Terebratulidan, member of Terebratellidae. |
Mollusks
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Androgynoceras [33] |
|
|
Shells | An ammonite of the family Liparoceratidae. | |
| Anisocardia [34] |
|
|
Shells | A clam, member of Arcticidae. | |
| Anticonulus [35] |
|
|
Shells | A Top Snail of the family Trochidae. | |
| Aptyxiella [27] [28] |
|
|
Shells | A snail of the family Nerinellidae. Dominant gastropod, a large taxon (+15 cm) found in gregarious communities.[34] | |
| Astarte [27] |
|
|
Shells | A clam, member of Astartidae. | |
| Ataphrus [35] |
|
|
Shells | An snail of the family Ataphridae. | |
| Austriacopsis [35] |
|
|
Shells | A keyhole limpet of the family Fissurellidae. | |
| Avicula [29] |
|
|
Shells | A clam, member of Aviculidae. | |
| Cardinia [28] |
|
|
Shells | A clam, member of Cardiniidae. | |
| Ceromya [28] |
|
|
Shells | A piddock, member of Ceromyidae. | |
| Ceritella [28] |
|
|
Shells | An snail of the family Cerithiidae. | |
| Cerithium [28] |
|
|
Shells | An snail of the family Cerithiidae. | |
| Charmasseiceras [33] |
|
|
Shells | An ammonite of the family Schlotheimiidae. | |
|
|
Shells |
An oyster, member of Plicatostylidae. It is one of the Three main bivalves recovered on the Lithiotis Facies.[37] |
||
| Cylindrites [28] |
|
|
Shells | A barrel bubble snail of the family Acteonidae. | |
| Cucullaea [27] [28] |
|
|
Shells | A clam, member of Cucullaeidae. | |
| Cypricardinia [28] [29] |
|
|
Shells | A clam, member of Trapezidae. | |
| Cyprina [28] |
|
|
Shells | A clam, member of Arcticidae. | |
| Discohelix [35] |
|
|
Shells | An snail of the family Discohelicidae. | |
| Emarginula [35] |
|
|
Shells | A keyhole limpet of the family Fissurellidae. | |
|
|
Shells |
A clam, member of Neomiodontidae. The so-called Eomiodon horizon represents the lower Rotzo Formation, with this genus considered an opportunistic shallow infaunal suspension feeder, and the marker genus for brackish environments.[39] |
||
| Eucyclus [35] |
|
|
Shells | An snail of the family Eucyclidae. | |
| Fuciniceras [33] |
|
|
Shells | An Ammonite of the Family Hildoceratidae | |
| Gastrochaenolites [40] |
|
|
Clavate, smooth borings |
Borings over Opisoma shells |
|
|
|
Shells |
An Oyster, member of Bakevelliidae. Found on greater accumulations on lower shale-dominated levels |
||
|
|
Shells |
An oyster, member of Plicatostylidae. On the Rotzo formation this genus become abundant along rootlets, indicative of a very shallow and restricted lagoon or marsh environment.[37] |
||
| Globularia [41] |
|
|
Shells | An snail of the family Ampullinidae. | |
| Gresslya [29] [31] |
|
|
Shells | A clam, member of Ceratomyidae. | |
| Gryphaea [28] |
|
|
Shells | A clam, member of Gryphaeidae. | |
| Guidonia [35] |
|
|
Shells | An snail of the family Trochonematidae. | |
| Homomya [27] |
|
|
Shells | A clam, member of Pleuromyidae. | |
| Juraphyllites [33] |
|
|
Shells | Type member of the family Juraphyllitidae. | |
| Lima [27] |
|
|
Shells | A clam, member of Limidae. | |
| Liostrea [27] |
|
|
Shells | A oyster, member of the family Flemingostreidae. | |
| Liparoceras [33] |
|
|
Shells | An ammonite of the family Liparoceratidae. | |
| Lithophaga [27] |
|
|
Shells | A mussel, member of the family Mytilidae. | |
|
|
Shells |
An oyster, member of Plicatostylidae. A large bivalve, up to 70 cm length. This genus was found to be a bivalve with a byssate juvenile stage that developed different modes of life on the adulthood depending on the individual density and bottom firmness.[38] |
||
|
|
Shells |
An oyster, member of Plicatostylidae. It is the major Bivalve identified on the formation, and the genus that gives the name to the "Lithiotis fauna".[37] Its accumulation have had different denominations on literature, such as banks, bioherms, biostromes, bivalve reefs or bivalve mounds.[37] |
||
| Lucina [27] |
|
|
Shells | A clam, member of Lucinidae. | |
| Meretrix [32] |
|
|
Shells | A venus clam, member of Veneridae. | |
| Modiolus [27] [28] |
|
|
Shells | A mussel, member of the family Mytilidae. | |
|
|
Shells |
A mussel, member of the family Mytilidae |
||
| Natica [29] |
|
|
Shells | A moon snail of the family Naticidae. | |
| Neritopsis [28] [35] |
|
|
Shells | An snail of the family Neritopsidae. | |
|
|
Shells |
A clam, member of Astartidae. Is considered a genus that evolved from shallow burrowing ancestors, becoming a secondarily semi-infaunal edgewise recliner adapted to photosymbiosis.[42] |
||
|
|
Shells |
An oyster, member of Plicatostylidae. |
||
|
|
Shells |
A clam, member of Megalodontidae. |
||
| Paleonucula [34] |
|
|
Shells | A nut clam of the family Nuculanidae | |
| Partschiceras [33] |
|
|
Shells | An Ammonite of the family Phylloceratidae. | |
| Patella [29] |
|
|
Shells | A limpet of the family Patellidae. | |
| Pecten [27] [28] |
|
|
Shells | A scallop, member of the family Pectinidae. | |
| Pholadomya [28] [31] |
|
|
Shells | A clam, member of Pholadomyidae. | |
| Pinna [27] [28] |
|
|
Shells | An oyster, member of Pinnidae. | |
| Placunopsis [27] |
|
|
Shells | A scallop, member of the family Anomiidae. | |
| Plectotrochus [35] |
|
|
Shells | An snail of the family Trochidae. | |
| Pleurotomaria [28] |
|
|
Shells | An snail of the family Pleurotomariidae. | |
| Plicatula [28] |
|
|
Shells | An oyster, member of Plicatulidae. | |
| Pleuromya [29] |
|
|
Shells | A clam, member of Pleuromyidae. | |
| Proacirsa [35] |
|
|
Shells | An snail of the family Gordenellidae. | |
| Pronoella [34] |
|
|
Shells | A clam, member of Arcticidae. | |
| Protodiceras [31] |
|
|
Shells | A clam, member of Megalodontidae. | |
| Protogrammoceras [44] |
|
|
Shells | An Ammonite of the family Hildoceratidae. | |
| Pseudonerinea [41] |
|
|
Shells | An snail of the family Pseudonerineidae. | |
| Pseudorhytidopilus [35] |
|
|
Shells | A limpet of the family Acmaeidae. | |
|
|
Shells |
A clam, incertae sedis inside Pterioida. On the Rotzo formation this byssate bivalve indicates a shallow subtidal or intertidal environment.[38] |
||
| Pteria [31] |
|
|
Shells | An oyster, member of Pteriidae. | |
| Rissoina [28] |
|
|
Shells | An snail of the family Rissoinidae. | |
| Tellina [27] |
|
|
Shells | A clam, member of Tellinidae. | |
| Tretospira [28] [41] |
|
|
Shells | A periwinkle of the family Purpurinidae. | |
| Trochus [29] |
|
|
Shells | A top snail of the family Trochidae. | |
| Turritella [28] [41] |
|
|
Shells | An snail of the family Turritellidae. | |
| Unicardium [28] |
|
|
Shells | An oyster, member of Unicardiidae. |
_Figure_10.jpg){kind=link}
_002.jpeg){kind=link}
Echinodermata
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Asteriacites [45] |
|
|
Star-shaped impressions | Resting trace of brittle stars (Ophiuroidea).[45] Probably from specimens trapped on tidal changes.[45] | |
| Hypodiadema [29] |
|
|
Sclerites | A Pseudodiadematidae Euechinoidean | |
| Pentacrinites [27] |
|
|
Columnals | A Sea lily of the family Pentacrinitidae. | |
|
|
Two specimens (MCV.20/02 and MCV.20/03) |
|||
| Pseudodiadema [27] |
|
|
Multiple specimens | A Pseudodiadematidae Euechinoidean |
Arthropoda
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Cypris [29] [27] |
|
|
Valves | An Ostracodan of the family Cyprididae | |
|
|
Slightly deformed Exuvia |
An Erymid Decapodan Crustacean. With a total length between 9-10 cm is one of the largest specimens belonging to this species. |
||
|
|
Valves |
An Ostracodan of the family Cytherideidae. The earliest record of the genus.[48] |
||
|
|
Valves |
An Ostracodan of the family Limnocytherinae. High probability to be a new species.[48] |
||
|
|
Lined or peloidal burrows |
Record "tamping or carrying activities" typical of decapods, identical to modern Callianassa and Upogebia . |
||
|
|
Valves |
An Ostracodan of the family Cytherideidae. The assemblage is dominated (>95%) by this taxon.[48] |
||
| Thalassinoides [47] [34] |
|
|
Branched burrows | Local forms are likely derived from giant decapods (probably Erymids). Turning chambers are linked to the behaviour of animals such as Callianassa . The atypical "isp. B" resemble more tunnels done by either Stomatopods or Malacostraca.[34] |
_-_Oberer_Brauner_Jura_-_Bissingen_unter_Teck.jpg){kind=link}
Annelida
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Isolated scolecodonts |
A polychaete of the family Dorvilleidae. Unlike the modern counterparts that live in deeper environments, this species is found linked with shallow marine facies |
| |
| Serpula [29] |
|
|
Isolated or accumulated tubes | A sessile Annelid of the family Serpulidae. |
.jpeg){kind=link}
Ichnofossils
[edit ]| Genus | Species | Provenance | Material | Made By | Images |
|---|---|---|---|---|---|
|
|
Vertical burrows with preserved entrances |
|||
|
|
Minute branching burrows |
|
||
|
|
Infilled abandoned burrows by coarse-grained skeletal debris |
|||
|
|
Vertical burrows |
|
Chondrichthyes
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Asteracanthus [50] | A. sp. |
|
Isolated Teeth | A member of the family Hybodontidae. | |
|
Indeterminate |
|
Isolated Teeth & Scales | Incertade Sedis | ||
| Hybodontiformes [51] | Indeterminate |
|
Isolated Teeth & Scales | Incertade Sedis | |
| H. sp. |
|
|
A member of the family Hybodontidae. |
||
| Piscichnus?[34] | P.? isp. |
|
Episodic surficial bioturbation | Assigned to mollusc predatory Chondrichthyes (Hybodontidae and Heterodontidae). It also resemble traces left by present day Squatinidae and Guitarfish.[34] | |
| Strophodus [51] [53] [54] |
|
|
Isolated Teeth & Scales | A member of the family Acrodontidae. |
Actinopterygii
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Apomesodon?[50] [53] [54] |
|
|
Fragment of splenial dentition; A large elliptical tooth | A Bony fish of the family Pycnodontidae. Also referred to the genera "Mesodon " and Gyronchus. | |
|
Indeterminate |
|
Isolated Teeth & Scales |
Previously referred to Semionotiformes and/or the genus Lepidotes. |
||
| Gyrodus?[54] [55] |
|
|
Isolated & semi-articulated material | A Bony fish of the family Pycnodontidae. | |
| Lepisosteiformes [51] | Indeterminate |
|
Isolated Teeth & Scales | Previously referred to Semionotiformes and/or the genus Lepidotes. | |
| Lepidotes?[50] [53] | L.? spp. |
|
Few scales and many teeth, mostly hemispherical | A Bony fish of the family Lepidotidae. | |
|
Indeterminate |
|
Isolated Teeth & Scales |
The oldest record of the family. |
||
|
Indeterminate |
|
Isolated Teeth & Scales | Incertade Sedis | ||
| Pholidophorus?[56] | P.? beggiatianus |
|
Partial specimen | A Bony fish of the family Pholidophoridae. Has been suggested to be an indeterminate species.[53] | |
|
Indeterminate |
|
Isolated Teeth & Scales |
Previously referred to the genus Pycnodus, concretely "P." mantelli (=Turbomesodon).[53] |
||
| Semionotiformes?[57] [58] | Indeterminate |
|
Isolated Teeth & Scales | Incertade Sedis |
Crocodyliformes
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
Indeterminate |
|
Isolated Teeth |
It was cited the presence of fragmentary and poorly preserved remains of "Teleosauridae?".[57] |
|
Dinosaurs
[edit ]On the Inter-supratidal levels show that on the Rotzo Formation the tracksites were rarely hit by Storm Waves.[60] Bella Lastra Tracksite recovers this environment, where the shales present (Where Fish & Crocodrylomorph Remains where found) are filled with plant roots, pollen grains, spores, freshwater ostracodes and the bivalve Eomiodon .[60] This was deposited mostly on a Lagoonar environment with abundant shed vegetation.[60] The main local Track record recovers specially Theropoda and Sauropoda, where the Sauropods are the most abundant tracks present (70%), moving the Otozum-like Sauropodomorphs of lower levels, with the climate changing from arid to humid.[60] The Coste dell'Anglone ichnosite is considered as derived from semi-arid tidal flat deposits, due to the abundance of Cheirolepidiaceae Pollen.[13] As the Pliensbachian Trento Platform is considered to be formed by a channelized barrier formed by sand, with reiterate tide emersions. The dinosaurs living here probably trampled on the subtidal flats looking for fishes trapped on tidal-derived ponds.[13]
| Color key Taxon
Reclassified taxon
Taxon falsely reported as present
Dubious taxon or junior synonym
Ichnotaxon
Ootaxon
Morphotaxon
|
Notes Uncertain or tentative taxa are in small text; |
| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Footprints |
Theropod tracks, incertae sedis inside Neotheropoda. All tracks were probably produced by individuals with the same functional anatomy of the hind foot.[60] |
||
|
|
Footprints |
Theropod tracks, incertae sedis inside Neotheropoda. The Coste dell ́Anglone tracksite had a pes with the metatarsal III elongated, as found on Dilophosaurus .[13] |
||
|
|
Footprints |
The tracks adscribed share some morphological affinity with those referred to the Ankylosauridae, such as the ichnogenera Metatetrapodus and Tetrapodosaurus , and probably belonged to medium-sized Scelidosaurs or other kind of Thyreophorans.[63] |
||
|
|
Footprints |
It wears morphological and morphometrical appearance that suggests relationships with a "prosauropod" trackmaker.[63] |
||
|
|
Footprints |
Sauropod tracks. The larger tracks comprise elliptic pes, what are among the largest known dinosaur tracks of the lower jurassic.[60] |
Flora
[edit ]_(San_Salvador_Island,_Bahamas)_6_(15598753449).jpg){kind=link}
The Rotzo Formation was deposited on a Lagoon on the emerged Trento Platform, leading to a well preserved fossil flora record, collected and studied since the 19th century.[65] The great level of floral fossilization has even allow to discovery fossil amber on the Bellori section. This amber has allowed to determine that the environment was a shallow tropical lagoon, only a few metres deep, closed seawards by oolitic shoals and bars.[65] This levels are dominated by a high abundance of Classopollis sp. (Cheirolepidiaceae), associated with dry and wet climates in coastal areas. The abundance of this group of conifers is also proven by the high presence of cuticles of Pagiophyllum cf. rotzoanum.[66] Beyond this genera, spores are highly diversified, including from Sphenophyta, Selaginellales to Ferns, with abundance (more than 50%) of trilete spores (Deltoidospora ), what suggest a good freshwater availability corresponding to a wet climate, proven also by the presence of aquatic miospores of algae such as Botryococcus and Pseudoschizaea .[65] The climate was arid on some seasons with monsoon months. The abundance of marine fauna on this sediments, including fragments of corals, bryozoans, bivalves, echinoids, and foraminifera, suggest transport from brackish lagoons and marshes, probably occurred during storm events.[65] Overall data points to a marshy and/or submerged paleoenvironment, comparable to the present-day Taxodium swamp or cypress swamp and a Bahamian-type marine environment in a rather wet monsoonal climate as in the modern southeastern Asia.[65] [66] The abundant presence of glossy black charcoal little fragments point to wildfires being a consistent local landscape feature.[67]
Amber
[edit ]The Rotzo Formation records one of the few Early Jurassic assamblages with Amber in the world, the nicknamed "Bellori amber" found near the village of the same name.[68] Made mostly of small droplets of less than 1 mm with exceptionally preserved morphology its likely the amber producing plants were likely not stressed or affected by disease.[68] Due to the small size animal inclusion have not been found. However various plant materials, identified "mummified wood" and wood tissue are known.[68] Additionally large amounts of Circumpolles Cheirolepidiaceous pollen, and occasional freshwater algae Pseudoschizaea remains are included.[68] Several cuticle fragments are attributed to the araucariaceous or Hirmeriellaceae genus Pagiophyllum .[68] Those lived on a coastal and wet palaeoenvironment similar to the present-day Taxodium swamps with monsoonal seasons as in the modern southern Asia.[68] More recently, an additional outcrop with amber, located in Vajo dell'Anguilla, was recovered, with again samples in thousands of thin filaments.[67]
Algae
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Imprints |
A green alga of the family Dasycladaceae. A reefal algae usually found in carbonate settings along all the Mediterranean |
||
|
|
Miospores |
Likely an alga, maybe Euglenid |
||
| Sestrosphaera [69] [71] |
|
|
Imprints | A green alga of the family Triploporellaceae. | |
| Solenopora [69] |
|
|
Imprints | A red alga of the family Solenoporaceae | |
|
|
Cysts |
Affinities with the extant genus Spirogyra (Zygnemataceae) |
||
| Thaumatoporella [69] |
|
|
Imprints | A green alga of the Thaumatoporellales group. The dominant alga locally |
_2020-10-07_Flaesheim-7705.jpg){kind=link}
Equisetales
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Spores |
Affinities with the Calamitaceae. |
||
|
|
Stems |
Affinities with Equisetaceae. |
||
|
|
Leaf Whorl |
Affinities with Phyllothecaceae. |
|
Lycophytes
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Selaginellaceae |
||
|
|
Spores |
Affinities with Selaginellaceae |
||
|
|
Spores. |
Affinities with Selaginellaceae |
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|
|
Spores |
Affinities with Selaginellaceae |
||
|
|
Spores |
Affinities with Selaginellaceae |
||
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Lycopodiaceae. |
||
|
|
Spores |
Affinities with Selaginellaceae |
Pteridophytes
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
||
|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
||
|
|
Spores |
Affinities with the family Osmundaceae. |
||
|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
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|
|
Fronds |
Affinities with Polypodiales. |
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|
|
Fronds |
Affinities with Marattiales. |
||
|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
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|
|
Fronds |
Affinities with Dipteridaceae. |
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|
|
Fronds |
Affinities with Gleicheniaceae. |
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|
|
Fronds |
Affinities with either Dicksoniaceae or Polypodiidae. Similar to the genus Coniopteris. |
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|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
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|
|
Fronds |
Affinities with Matoniaceae. |
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|
|
Spores |
Affinities with the Ophioglossaceae. |
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|
|
Fronds |
Affinities with Matoniaceae. |
| |
|
|
Fronds |
Affinities with Matoniaceae. |
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|
|
Fronds |
Affinities with Matoniaceae. |
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|
|
Fronds |
Affinities with Dipteridaceae. A rather lower Fern, with great resemblance with the modern genus Dipteris . |
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|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
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|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
||
|
|
Spores |
Affinities with the family Osmundaceae. |
||
|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
||
|
|
Spores |
Incertae sedis; affinities with the Pteridophyta |
Corystospermales
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Spores |
Affinities with Corystospermales and Peltaspermales |
||
|
|
Fronds |
Affinities with Corystospermaceae. On the Roverè di Velo collection, C. brauniana is the most common Frond found. |
| |
|
|
Fronds |
Affinities with Corystospermaceae. |
||
|
|
Fronds |
Affinities with Corystospermaceae. Represents the largest "Seed Fern" Leaf in the fossil record, with leaves up to 70 cm, having an habit resembling the extant angiosperm Nypa fruticans .[77] |
|
Caytoniales
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Leaflets |
Affinities with Caytoniaceae. |
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|
|
Leaflets |
Affinities with Caytoniaceae. |
| |
|
|
Pollen |
Affinities with the family Caytoniaceae. |
Erdtmanithecales
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Pollen |
Type pollen of the Erdtmanithecales, related to the Gnetales. |
Cycadophyta
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Androstrobus [78] |
|
|
Reproductive structure | Incertade sedis inside Cycadophyta. | |
| Apoldia [73] |
|
|
Leaflets | Incertade sedis inside Cycadophyta. | |
|
|
Pollen |
Affinities with the family Zamiaceae. Was found to be similar to the pollen of the extant Encephalartos laevifolius .[79] |
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|
|
Pollen |
Affinities with the family Cycadaceae. |
||
| Cycadospadix [78] |
|
|
Reproductive structure | Incertade sedis inside Bennettitales or Cycadophyta | |
| Taeniopteris [34] |
|
|
Leaves | Affinities with either Cycadales, Bennettitales or Pentoxylales. Suggested habit similar to that of brambles |
Bennettitales
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
| Blastolepis [78] [80] |
|
|
Reproductive structure | Incertade sedis inside Bennettitales. | |
| Cycadeospermum [78] |
|
|
Reproductive structure | Incertade sedis inside Bennettitales or Cycadophyta | |
| Deltolepis [73] [76] |
|
|
Reproductive structure | Incertade sedis inside Bennettitales or Cycadophyta | |
|
|
Fronds |
Incertade sedis inside Bennettitales. |
| |
|
|
Pinnate leaf fragments |
Affinities with Williamsoniaceae. Otozamites is among the most abundant flora genus recovered on some of the levels. |
| |
|
|
Leaflets |
Affinities with Williamsoniaceae. |
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|
|
Leaves |
Affinities with Williamsoniaceae. Was previously ascribed to Pachypteris visianica and Cycadopteris brauniana. |
| |
|
|
Leaflets |
Affinities with Williamsoniaceae. |
||
|
|
Bennettite "Flower" |
Affinities with Williamsoniaceae. |
||
| Wielandiella [80] [81] |
|
|
'strobilus' | Affinities with Williamsoniaceae. | |
|
|
Bennettite "Flower" |
Affinities with Williamsoniaceae. |
| |
|
|
Leaflets |
Incertade sedis inside Bennettitales. |
Ginkgoopsida
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
Pollen |
Affinities with the family Karkeniaceae and Ginkgoaceae. |
||
|
|
Leaves |
Affinities with the genus Trichopitys , as probably a member of Karkeniaceae, with strong resemblance with the genus Baiera, lumped in some papers as Baiera lindleyana. |
|
Conifers
[edit ]| Genus | Species | Provenance | Material | Notes | Images |
|---|---|---|---|---|---|
|
|
|
Affinities with Araucariaceae or Cheirolepidiaceae. Brachyphyllum tropidimorphyrn shows close resemblance between African and Venetian conifers and its distribution suggests a lowland araucarian forest.[83] |
| |
|
|
Pollen |
Affinities with the Hirmeriellaceae. |
||
|
|
Branched shoots |
Affinities with the Hirmeriellaceae. |
||
|
|
Isolated leaves |
A possible Conifer leaf. Was suggested to have affinities with Czekanowskiales, sometimes found inside Ginkgoopsida, yet recent finds of it associated with the cone genera Sphaerostrobus and Ourostrobus points to a coniferophyte affinity, maybe as a member of Palissyaceae.[84] |
||
|
|
Branched shoots |
Affinities with Cupressaceae. Arboreal plants similar to the modern genus Cunninghamia. |
| |
|
|
Pollen |
Affinities with the Hirmeriellaceae. |
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|
|
|
Affinities with Araucariaceae or Cheirolepidiaceae. One of the specimens was assigned to Otozamites massalongianus. |
| |
|
|
|
Incertae sedis inside Coniferales, initially identified as "Yuccites schimperianus", suggested as a member of its own family, the "Pelourdeaceae". A hygrophytic riparian conifer with herbaceous or shrubby habit. |
||
|
|
Pollen |
Affinities with the family Cupressaceae. |
||
|
|
Pollen |
Affinities with the family Pinaceae. |
||
|
|
Pollen |
Affinities with the Hirmeriellaceae. |
||
|
|
Branched shoots |
Affinities with Palyssiaceae. Extinct group conifer leaves with similarities with Sequoia or Amentotaxus. Maybe Includes the species "Taxites vicentina". |
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