Snow Hill Island Formation

Last updated
Snow Hill Island Formation
Stratigraphic range: Early Maastrichtian
71.2–70.8  Ma
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Snow Hill Island Formation paleoenvironment recon.jpg
Artist's reconstruction of the paleoenvironment of the Snow Hill Island Formation.
Type Geological formation
Unit of Marambio Group
Sub-unitsGamma & Herbert Sound Members
Underlies Lopez de Bertodano Formation
Overlies Santa Marta Formation
Lithology
Primary Sandstone
Other Mudstone
Location
Coordinates 63°54′S57°54′W / 63.9°S 57.9°W / -63.9; -57.9
Approximate paleocoordinates 61°48′S68°30′W / 61.8°S 68.5°W / -61.8; -68.5
Region James Ross Island, James Ross Island group
Country Antarctica
Geologic map of Seymour Island, Antarctica.png
Geologic map of Seymour Island, Antarctica with Snow Hill Island Formation in dark green

The Snow Hill Island Formation is an Early Maastrichtian geologic formation found on James Ross Island, James Ross Island group, Antarctica. [1] Remains of a paravian theropod Imperobator antarcticus [2] have been recovered from it, as well as the elasmarian ornithopods Trinisaura santamartaensis, Biscoveosaurus and Morrosaurus antarcticus, the ankylosaurian Antarctopelta oliveroi, and the shark Notidanodon sp. Alongside these described genera are also the remains of indeterminate elasmosaurids, [3] lithostrotian titanosaurs and an indeterminate pterosaur. [4]

Contents

In the Herbert Sound Member of the Snow Hill Island Formation, bivalves, ammonites, and fish were found. [5]

Fossil content

Vertebrate

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Plesiosaurs

Plesiosaurs
GenusSpeciesPresenceMaterialNotesImages
Elasmosauridae Gen. et. sp. indet."MLP 11-II-20-4, one cervical vertebra preserving a partial rib; MLP 86-X-28-3, two cervical vertebrae; MLP 86-X-28-(2–6), 10 posterior cervical vertebrae articulated with three pectoral vertebrae, part of two dorsal vertebrae, ribs, and indeterminate fragments." [6]
Vegasaurus V. molyiCape Lamb member, Vega Island.Partial Skeleton (MLP 93-I-5-1).A plesiosaur.
Vegasaurus molyi.png

Mosasaurs

Mosasaurs
GenusSpeciesPresenceMaterialNotesImages
Taniwhasaurus [7] T. antarcticusJames Ross Island.IAA 2000-JR-FSM-1, containing a skull measuring 72 cm (28 in) long, teeth, some vertebrae, and rib fragments.A tylosaur.
Taniwhasaurus Taniwhasaurus.jpg
Taniwhasaurus

Dinosaurs

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Dinosaurs
GenusSpeciesPresenceMaterialNotesImages
Antarcticavis A. capelambensis [8] Cape Lambe Member, Vega Island.Partial Skeleton (SDSM 78147) consists of two thoracic vertebrae, the sternum keel, the right coracoid and shoulder blade, the sternal part of the left coracoid, the right upper arm, parts of the left upper arm, the proximal right ulna, the proximal left ulna and radius (articulated), the proximal right carpometacarpus, the proximal left carpometacarpus, the distal left carpometacarpus, the synsacrum, the right and left thighs, the proximal right tibiotarsus, the right and left distal tibiotarsus, and the proximal right tarsometatarsus.
Antarctopelta A. oliveroiSanta Marta Cove.A partial skeleton (MLP 86-X-28-1) consists of three isolated teeth, part of the lower jaw with another tooth in situ, some other skull fragments, vertebrae of the neck, back, hips and tail, some shoulder and hip bones (scapula, ilium) a thigh bone (femur), foot and hand bones (five metapodials and two phalanges), and numerous pieces of armor.A parankylosaur
Antarctopelta_Size_Comparison Antarctopelta Size Comparison.svg
Antarctopelta_Size_Comparison
"Biscoveosaurus"IndeterminateCape Lamb Member. [9] [10] Dentaries, teeth, a braincase, parts of the maxillae, forelimb elements, assorted vertebrae, and the pectoral girdle.An ornithopod.
Iguanodontidae IndeterminateCape Lamb Member.
Imperobator I. antarcticusCape Lamb Member, Naze Peninsula. [11] A single specimen that contains skull fragments possibly from the premaxilla, maxilla, and dentary as well as a caudal vertebra, teeth, and pedal elements, UCMP 276000.A large paravian.
Imperobator UDL.png
Morrosaurus M. antarcticusCape Lamb Member. [12] Fragmentary right hind limb. [12] An elasmarian ornithopod.
Morrosaurus.jpg
Titanosauria Indeterminate.Santa Marta Cove.Partial caudal vertebra.
Trinisaura T. santamartaensisSanta Marta Cove, in the lower levels of the formation. [13] MLP08-III-1-1, disarticulated and partial skeleton that includes one incomplete dorsal vertebra, three sacral centra, seven caudal vertebrae; two incomplete dorsal rib shafts, one proximal haemal arch, incomplete right scapulocoracoid, incomplete right humerus, two metacarpals, both ilia, right pubis, right ischium, right femur, right distal tibia, incomplete metatarsal III, first phalanx of pedal digit III, two phalanges of pedal digit IV, and indeterminate fragments.An elasmarian ornithopod.
Trinisaura2.jpg

Fish

Fish
GenusSpeciesPresenceMaterialNotesImages
Chimaera C. zangerliSanta Marta Cove, James Ross Island.A chimaera.
Chlamydoselachus C. thompsoniSanta Marta Cove, James Ross Island.Complete dentition.A frilled shark.
Edaphodon E. snowhillensisHerbert Sound Member. [14] Complete dentition. [14] A large species of chimaera.
Notidanodon N. dentatusCape Lamb Member, Vega Island.A cow shark.

Pterosaur

Pterosaurs
GenusSpeciesPresenceMaterialNotesImages
Pterodactyloidea gen. et sp. Indet.Camp Lamb, Vega Island.MN 7801-V, a wing metacarpal IV. [15] A pterosaur with an estimated wingspan of 4 to 5 meters. [15]

Invertebrate

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Invertebrates
GenusSpeciesPresenceMaterialNotesImages
Fungiacyathus F. deltoidophorusKarlsen Cliffs Member. [16]
Scleractinia indet.UnidentifiableKarlsen Cliffs Member. [16]

See also

Related Research Articles

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References

  1. di Pasquo, M.; Martin, J.E. (2013). "Palynoassemblages Associated with a Theropod Dinosaur from the Snow Hill Island Formation (lower Maastrichtian) at the Naze, James Ross Island, Antarctica". Cretaceous Research. 45: 135–154. Bibcode:2013CrRes..45..135D. doi:10.1016/j.cretres.2013.07.008. hdl: 11336/80121 .
  2. Ely & Case, 2019
  3. O'Gorman, 2012, p.2
  4. Reguero, Marcelo & Gasparini, Zulma & Olivero, Eduardo & Coria, Rodolfo & Fernandez, Marta & O'Gorman, José & Gouiric Cavalli, Soledad & Acosta Hospitaleche, Carolina & Bona, Paula & Iglesias, Ari & Gelfo, Javier N. & Raffi, María & Moly, Juan. (2022). Late Campanian-Early Maastrichtian Vertebrates From The James Ross Basin, West Antarctica: Updated Synthesis, Biostratigraphy, And Paleobiogeography. Anais da Academia Brasileira de Ciências. 20211142. 10.1590/0001-3765202220211142.
  5. O'Gorman, 2012, p.3
  6. O'Gorman, J.P. 2012. The oldest elasmosaurs (Sauropterygia, Plesiosauria) from Antarctica, Santa Marta Formation (upper Coniacian? Santonian-?upper Campanian) and Snow Hill Island Formation (upper Campanian-?lower Maastrichtian), James Ross Island. Polar Research 31. 1–10. Accessed 2019-04-13. doi:10.3402/polar.v31i0.11090
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  9. Lamanna, Matthew C.; Case, Judd A.; Roberts, Eric M.; Arbour, Victoria M.; Ely, Ricardo C.; Salisbury, Steven W.; Clarke, Julia A.; Malinzak, D. Edward; West, Abagael R.; O'connor, Patrick M. (2019). "Late Cretaceous non-avian dinosaurs from the James Ross Basin, Antarctica: description of new material, updated synthesis, biostratigraphy, and paleobiogeography". Advances in Polar Science. 30 (3): 228–250. doi:10.13679/j.advps.2019.0007.
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  12. 1 2 Rozadilla, Sebastián; Agnolin, Federico L.; Novas, Fernando E.; Aranciaga Rolando, Alexis M.; Motta, Matías J.; Lirio, Juan M.; Isasi, Marcelo P. (2016-01-01). "A new ornithopod (Dinosauria, Ornithischia) from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications". Cretaceous Research. 57: 311–324. Bibcode:2016CrRes..57..311R. doi:10.1016/j.cretres.2015.09.009. hdl: 11336/46572 . ISSN   0195-6671.
  13. Coria, Rodolfo A.; Moly, Juan J.; Reguero, Marcelo; Santillana, Sergio; Marenssi, Sergio (2013-04-01). "A new ornithopod (Dinosauria; Ornithischia) from Antarctica". Cretaceous Research. 41: 186–193. Bibcode:2013CrRes..41..186C. doi:10.1016/j.cretres.2012.12.004. hdl: 11336/76749 . ISSN   0195-6671.
  14. 1 2 Gouiric-Cavalli, Soledad; Cabrera, Daniel A.; Cione, Alberto L.; O'Gorman, José P.; Coria, Rodolfo A.; Fernández, Marta (2015-09-03). "The first record of the chimaeroid genus Edaphodon (Chondrichthyes, Holocephali) from Antarctica (Snow Hill Island Formation, Late Cretaceous, James Ross Island)". Journal of Vertebrate Paleontology. 35 (5): e981128. Bibcode:2015JVPal..35E1128G. doi:10.1080/02724634.2015.981128. hdl: 11336/53488 . ISSN   0272-4634. S2CID   129091192.
  15. 1 2 KELLNER, ALEXANDER W.A.; RODRIGUES, TAISSA; COSTA, FABIANA R.; WEINSCHÜTZ, LUIZ C.; FIGUEIREDO, RODRIGO G.; SOUZA, GEOVANE A. DE; BRUM, ARTHUR S.; ELEUTÉRIO, LÚCIA H.S.; MUELLER, CARSTEN W.; SAYÃO, JULIANA M. (2019). "Pterodactyloid pterosaur bones from Cretaceous deposits of the Antarctic Peninsula". Anais da Academia Brasileira de Ciências. 91 (suppl 2): e20191300. doi: 10.1590/0001-3765201920191300 . ISSN   1678-2690. PMID   31800676. S2CID   208642733.
  16. 1 2 Videira-Santos, Roberto; Tobin, Thomas S.; Scheffler, Sandro Marcelo (2022-08-14). "New occurrences of caryophylliid and fungiacyathid scleractinian corals from the Santa Marta and Snow Hill Island formations (Upper Cretaceous, Antarctica)". Cretaceous Research. 140: 105338. Bibcode:2022CrRes.14005338V. doi:10.1016/j.cretres.2022.105338. ISSN   0195-6671. S2CID   251576799.

Bibliography

Further reading