Unit 9, Lopez de Bertodano FM., Seymour Island: Maastrichtian, Antarctica

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Reptilia indet. Laurenti 1768
Reptilia - Mosasauridae
Mosasaurinae indet. Gervais 1853
O’Gorman et al. 2023 1 specimen
IAA-Pv 819, an almost complete right humerus.
Reptilia - Plesiosauria - Elasmosauridae
Elasmosauridae indet. Cope 1869
O’Gorman et al. 2020 1 individual
IAA Pv 443, an incomplete skeleton comprising the mandibular symphysis and part of right and left mandibular rami, cervical and dorsal centra, an incomplete humerus, radius, ulna, ulnare, intermedium, radiale and distal carpal 1, 2 þ 3 and 4, other fragmentary postcranial bones and associated gastroliths
cf. Aristonectes sp. Cabrera 1941
O'Gorman et al. 2019 1 specimen
MLP 89-III-3-1, postcranial skeleton
Sabellida - Serpulidae
Rotularia zinsmeisteri
Bivalvia - Nuculida - Nuculidae
Leionucula suboblonga (Wilckens 1907)
Bivalvia - Nuculanida - Malletiidae
Australoneilo gracilis (Wilckens 1907)
Bivalvia - Trigoniida - Trigoniidae
Oistotrigonia regina
Bivalvia - Lucinida - Lucinidae
Lucina scotti
Bivalvia - Hiatellida - Hiatellidae
Panopea clausa (Wilckens 1910)
Bivalvia - Cardiida - Veneridae
Cyclorisma chaneyi
Bivalvia - Cardiida - Lahillidae
Lahillia larseni (Sharman and Newton 1897)
Bivalvia - Pholadomyida - Pholadomyidae
Goniomya hyriiformis
Bivalvia - Arcida - Cucullaeidae
Cucullaea antarctica Wilckens 1907
Bivalvia - Ostreida - Pinnidae
Pinna freneizae
Bivalvia - Ostreida - Malleidae
Pulvinites antarctica
Bivalvia - Ostreida - Pteriidae
Phelopteria feldmanni
Bivalvia - Ostreida - Gryphaeidae
Pycnodonte seymouriensis
Pycnodonte vesiculosa (Sowerby 1822)
listed as "Pynodonte", bivalve - typo
Bivalvia - Pectinida - Entoliidae
Entolium sadleri
Entolium seymouriensis
Bivalvia - Pectinida - Limidae
Seymourtula antarctica (Wilckens 1910)
Acesta shackletoni
Cephalopoda - Ammonitida - Diplomoceratidae
Diplomoceras sp. Hyatt 1900
Cephalopoda - Ammonitida - Pachydiscidae
Pachydiscus riccardi (Macellari 1986)
Pachydiscus ultimus Macellari 1986
Cephalopoda - Ammonitida - Kossmaticeratidae
Maorites densicostatus (Kilian and Reboul 1909)
Cephalopoda - Ammonitida - Tetragonitidae
Pseudophyllites loryi (Kilian and Reboul 1909)
Scaphopoda - Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758
Gastropoda - Naticidae
Eunaticina arctowskiana
Gastropoda - Cassidae
Cassidaria mirablis
unclassified
Surobula nucleus
Eslaevitrigonia pygscelium
Anaguandryceras seymouriensis
Cimonia sp.
Kitchenites laurae
Grossuvrites gemmatus
Linuparis macellari
Gastropoda - Aporrhaidae
Perissoptera sp. Tate 1865
Gastropoda - Neogastropoda - Tudiclidae
Heterotrema sp. (Gabb 1869)
Gastropoda - Neogastropoda - Fasciolariidae
Taioma charcotianus
Fusinus sp. Rafinesque 1815
Fusinus phillippiana
Gastropoda - Eucyclidae
Amberleya spinigera
Gastropoda - Patellida - Lottiidae
Acmaea sp. Eschscholtz 1830
Malacostraca - Decapoda - Nephropidae
Hoploparia stokesi (Weller 1903)
Metanephrops jenkinsi Feldmann 1989
see common names

Geography
Country:Antarctica State/province:Seymour Island
Coordinates: 64.3° South, 56.8° West (view map)
Paleocoordinates:62.5° South, 67.5° West
Geographic resolution:small collection
Time
Period: Cretaceous Epoch: Late Cretaceous
Stage: Maastrichtian 10 m.y. bin: Cretaceous 8
Key time interval: Maastrichtian
Age range of interval: 72.1 - 66 m.y. ago
Stratigraphy
Formation:Lopez de Bertodano
Local section:Section C of Macellari 1984 Local bed:Unit 9
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: This is restricted to Unit 9, of the 10 units into which the Lopez de Bertodano FM was divided, and it falls below the K-T boundary, though it is ill-defined. This collection is only for Unit 9 taxa collected BELOW the "K/T transition interval", and so is clearly Maastrichtian in age.
Lithology and environment
Primary lithology:bioturbation,glauconitic poorly lithified silty sandstone
Secondary lithology: siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: siltstones, silty concretionary sandstones, glauconitic sandstones, some volcanoclastic component
Environment:offshore
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:all microfossils
Collection methods:bulk,field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: All macrofossils were collected
Metadata
Database number:63513
Authorizer:L. Ivany, P. Mannion Enterer:L. Ivany, P. Mannion
Modifier:F. Aspromonte Research group:marine invertebrate
Created:2006-08-15 14:59:34 Last modified:2023-11-09 12:26:45
Access level:the public Released:2006-08-15 14:59:34
Creative Commons license:CC BY
Reference information

Primary reference:
531. W. J. Zinsmeister, R. M. Feldmann, M. O. Woodburne and D. H. Elliot. 1989. Latest Cretaceous/Earliest Tertiary Transition on Seymour Island, Antarctica. Journal of Paleontology 63(6):731-738 [L. Ivany/E. Kowalski/J. Alroy]

Secondary references:

86379 J. P. O'Gorman, R. Otero, M. Reguero and Z. Gasparini. 2019. Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography. Advances in Polar Science 30(3):210-227 [E. Vlachos/F. Aspromonte]
71989 J. P. O'Gorman, S. Santillana, R. Otero and M. Reguero. 2019. A giant elasmosaurid (Sauropterygia; Plesiosauria) from Antarctica: New information on elasmosaurid body size diversity and aristonectine evolutionary scenarios. Cretaceous Research 102:37-58 [P. Mannion/P. Mannion/F. Aspromonte]
74517 J. P. O’Gorman, P. Bona, M. Reyes, M. E. Raffi, and M. Reguero. 2020. A non-aristonectine plesiosaur from Antarctica reveals new data on the mandibular symphysis of elasmosaurids. Alcheringa [P. Mannion/P. Mannion]
85521 J. P. O’Gorman, P. Bona, J. I. Canale, D. E. Tineo, M. S. Fernández, M. Cárdenas, and M. Reguero. 2023. A new mosasaurine specimen (Squamata, Mosasauridae) from the Upper Cretaceous of Antarctica with comments on the Weddellian diversity of Mosasaurinae. Alcheringa 47(2):211-220 [P. Mannion/P. Mannion/F. Aspromonte]