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.
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•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.
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•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
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Malacostraca | |
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Insecta | |
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Gastropoda | |
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Bivalvia | |
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"Pelecypoda indet." = Bivalvia5
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Chondrichthyes | |
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Actinopteri | |
Trichiurus sp.7 Linnaeus 1758 | |
Labridae indet.7 Cuvier 1816 | |
Oplegnathus sp.7 Richardson 1840 | |
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Beryciformes indet.7 Patterson 1964 | |
Reptilia | |
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Aves | |
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Marambiornis exilis7, Anthropornis nordenskjoeldi7, Anthropornis grandis6, "Delphinornis wimani" = Archaeospheniscus wimani7, Mesetaornis polaris7
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Mammalia | |
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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.
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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.
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Crinoidea | |
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