DVP 2/84 (Eocene to of Antarctica)

Where: Seymour Island, Antarctica (64.2° S, 56.6° W: paleocoordinates 63.9° S, 60.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Telm 4 Member (La Meseta Formation), Lutetian to Lutetian (47.8 - 38.0 Ma)

• Telm 4 of Sadler 1988; Unit II of Elliot & Trautman 1982; Cucullaea I Allomember (Reguero et al 2012); he age of this horizon of ca. 52.5 Ma (Ypresian) is indicated by the strontium stratigraphy based on the 87Sr/86Sr ratios of carbonate shells of the overlying beds of the Cucullaea I Allomember and it is consistent with paleomagnetic and biostratigraphic data (Montes et al. 2010)(Fig. 2). (Reguero et al 2012). Age based on Buono et al 2016.

•In summary, considering that 87Sr/86Sr ratios provided for TELM 4 might be biased (because of potential reworking and oscillation of the marine Sr isotope curve during the Eocene), we interpret the age of the horizon that produced MLP 11-II-21-3 (i.e., TELM 4) as early middle Eocene (~46– 40 Ma; middle Lutetian to early Bartonian based on ICS International Chronostratigraphic Chart 2015; Cohen et al., 2013) and follow the most recent chronostratigraphic in- terpretation for the La Meseta Formation (Douglas et al.,2014: fig. S1). This age is also more consistent with the published stratigraphic record of basilosaurids elsewhere.

•Previous reports of basilosaurids in the Southern Hemisphere come from approximately coeval deposits from New Zealand (39.5–34 Ma, late Bartonian–Priabonian based on recent interpretation of the lower Greensand Member; Marx and Fordyce, 2015) and Peru (41–37 Ma, Bartonian; Uhen et al., 2011). With a middle Lutetian–early Bartonian age, MLP11-II-21-3 predates other basilosaurid records and provides the oldest Pelagiceti record known worldwide, documenting an early global dispersal of basilosaurids.

• member-level stratigraphic resolution

Environment/lithology: estuary or bay; pebbly, conglomeratic sandstone

Size classes: macrofossils, mesofossils

Preservation: original phosphate

Reposited in the MLP

Collection methods: surface (float), surface (in situ), sieve,

Primary reference: A. L. Cione and M. A. Reguero. 1994. New records of the sharks Isurus and Hexanchus from the Eocene of Seymour Island, Antarctica. Proceedings of the Geologists' Association 105:1-14 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 53666: authorized by Mark Uhen, entered by Mark Uhen on 13.09.2005, edited by Jelle Zijlstra and Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

 Decapoda - Homolodromiidae
Homolodromia chaneyi5 Feldmann and Wilson 1988 crab
 Coleoptera - Teredidae
 Arcida - Cucullaeidae
Cucullaea sp.5 Lamarck 1801 clam
"Pelecypoda indet." = Bivalvia5
"Pelecypoda indet." = Bivalvia5 Linnaeus 1758 clam
Gastropoda indet.5 Cuvier 1795 snail
 Sorbeoconcha - Struthiolariidae
Antarctodarwinella sp.5 Zinsmeister 1976 snail
 Chimaeriformes - Chimaeridae
 Chimaeriformes - Callorhynchidae
Ischyodus dolloi7 plownose chimaera
 Squatiniformes - Squatinidae
Squatina sp.7 Dumeril 1806 angel shark
 Squaliformes - Squalidae
Squalus woodburnei7 Long 1992 dogfish shark
Squalus weltoni7 Long 1992 dogfish shark
 Squaliformes - Centrophoridae
Centrophorus sp.7 Müller and Henle 1837 gulper shark
Deania sp.7 Jordan and Snyder 1902 gulper shark
 Hexanchiformes - Hexanchidae
"Heptranchias howelli" = Heptranchias howellii7, Hexanchus sp.7
"Heptranchias howelli" = Heptranchias howellii7 Reed 1946 sevengill shark
Hexanchus sp.7 Rafinesque 1810 sixgill shark
 Pristiophoriformes - Pristiophoridae
Pristiophorus lanceolatus7 Davis 1888 saw shark
 Rhinopristiformes - Pristidae
Pristis sp.7 Linck 1790 sawfish
 Orectolobiformes - Stegostomatidae
Stegostoma cf. fasciatum7 Herman 1783 carpet shark
 Orectolobiformes - Ginglymostomatidae
Pseudoginglymostoma cf. brevicaudatum7 Geunther 1866 nurse shark
 Carcharhiniformes - Carcharhinidae
Carcharhinus sp.7 de Blainville 1816 requiem shark
Scoliodon sp.7 Muller and Henle 1837 requiem shark
 Lamniformes - Odontaspididae
Odontaspis winkleri7 Leriche 1905 sand tiger shark
 Lamniformes - Mitsukurinidae
Striatolamia macrota7 Agassiz 1838 goblin shark
Anomotodon multidenticulata7 Long 1992 goblin shark
 Lamniformes - Lamnidae
"Carcharocles auriculatus" = Carcharodon auriculatus7, Lamna cf. nasus7, Isurus praecursor7
"Carcharocles auriculatus" = Carcharodon auriculatus7 Blainville 1818 white shark
Lamna cf. nasus7 mackerel shark
Isurus praecursor7 Thurmond and Jones 1981 mackerel shark
 Lamniformes - Cetorhinidae
Cetorhinus sp.7 de Blainville 1816 basking shark
 Synechodontiformes - Paraorthacodontidae
Paraorthacodus sp.7 Glikman 1957 elasmobranch
 Myliobatiformes - Myliobatidae
Myliobatis sp.7 Cuvier 1816 eagle ray
Mammalia indet.5 Linnaeus 1758 mammal
 Mammalia -
Mammalia indet.4 Linnaeus 1758 mammal
 Polydolopimorphia - Polydolopidae
Antarctodolops dailyi3 metatherian
MLP 89-III-2-1
 Astrapotheria -
Antarctodon sobrali n. gen. n. sp.1
Antarctodon sobrali n. gen. n. sp.1 Bond et al. 2011 placental
MLP 08-XI-30-1, an isolated right p4 or m1.
 Cetacea - Basilosauridae
Basilosauridae indet.8 Cope 1867 whale
MLP 11-II-21-3; Reguero et. al (2012) identify this specimen as Pelagiceti indet. in the figure caption, but as Basilosauridae indet. in the text.
 Panameriungulata - Sparnotheriodontidae
Notolophus arquinotiensis2 Bond et al. 2006 placental
 Testudines -
Testudines indet.7 Batsch 1788 turtle
 Testudines - Dermochelyidae
Dermochelyidae indet.8 Lydekker 1889 leatherback
"Psephophorus" sp.7 von Meyer 1847 leatherback
 Procellariiformes - Diomedeidae
Diomedeidae indet.7 Gray 1840 albatross
 Sphenisciformes -
Mesetaornis polaris7 Myrcha et al. 2002 penguin
 Sphenisciformes - Spheniscidae
Palaeeudyptes klekowskii7 Myrcha et al. 2002 penguin
Palaeeudyptes gunnari7 Wiman 1905 penguin
 Sphenisciformes -
Marambiornis exilis7 Myrcha et al. 2002 penguin
Anthropornis grandis6 Wiman 1905 penguin
Anthropornis nordenskjoeldi7 Wiman 1905 penguin
"Delphinornis wimani" = Archaeospheniscus wimani7 Marples 1953 penguin
 Odontopterygiformes - Pelagornithidae
Pelagornithidae indet.7 Fürbringer 1888 bird
 Teleostei -
Beryciformes indet.7 Patterson 1964
 Scombriformes - Trichiuridae
Trichiurus sp.7 Linnaeus 1758
 Labriformes - Labridae
Labridae indet.7 Cuvier 1816
 Acanthomorphata - Oplegnathidae
Oplegnathus sp.7 Richardson 1840
 Istiophoriformes - Xiphiidae
cf. Xiphiorhynchus sp.7 Van Beneden 1871 sword fish
 Teleostei -
Crinoidea indet.5 Miller 1821 Sea lily