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)