Where: Antarctica (64.2° S, 56.7° W: paleocoordinates 64.2° S, 59.1° W)
• coordinate estimated from map
When: Telm 5 Member (La Meseta Formation), Bartonian to Bartonian (41.3 - 33.9 Ma)
• The age model for the La Meseta Formation (and recently-defined Submeseta Formation) is controversial. Strontium isotopes (Ivany et al., 2008) suggest earlier ages, with the La Meseta (Telm1-Telm5) almost entirely Ypresian and the Submeseta (Telm6-Telm7) Middle-Late Eocene. Montes et al. (2013) also created an age model incorporating magnetostratigraphy to support the largely-Ypresian age for the La Meseta and Middle-Late Eocene for the Submeseta. Some mammals are similar to the radiometrically-constrained late early Eocene Paso del Sapo assemblage of Patagonia (Gelfo et al., 2009, Tejedor et al., 2009), but the mammals are not exactly similar (Bond et al., 2011). However, Douglas et al. (2014) re-evaluated the strontium data and used dinoflagellate biostratigraphy to argue for a Lutetian (Telm2-4) and younger (Bartonian to mid-Priabonian for Telm5-6) age range. AmenĂ¡bar et al. (2019) also found younger ages from dinoflagellates: Lutetian (Telm1-mid Telm 3), Bartonian (mid Telm 3-mid Telm 5), and Priabonian (upper Telm 5), SPDZ10-SPDZ13. This age range is more consistent with the presence of basilosaurid whales in Telm4 and Telm7, as basilosaurids are globally-distributed first in the middle Eocene (Buono et al., 2016). Although the ages are still debated, the dinoflagellate age model of AmenĂ¡bar et al. (2019) is used here.
• group of beds-level stratigraphic resolution
Environment/lithology: paralic; unlithified sandstone
Size class: macrofossils
Collected by Gazdzicki
• Repository: Institute of Paleobiology of the Polish Academy of Sciences
Primary reference: J. Dzik and A. Gazdzicki. 2001. The Eocene expansion of nautilids to high latitudes. Palaeogeography, Palaeoclimatology, Palaeoecology 172:297-312 [M. Clapham/K. Okamoto/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 173115: authorized by Matthew Clapham, entered by Kristina Okamoto on 09.09.2015, edited by Franco Villegas-Garin
Creative Commons license: CC BY (attribution)
Taxonomic list
Mammalia | |
Trigonostylops sp. Ameghino 1897 placental | |
"Victorlemoinea sp." = Victorlemoineia
"Victorlemoinea sp." = Victorlemoineia Ameghino 1901 placental | |
Marambiotherium glacialis Goin et al. 1999 marsupial | |
Derorhynchus minutus Goin et al. 1999 marsupial
"Xenostylus peninsularis" = Xenostylos peninsularis Goin et al. 1999 marsupial
Pauladelphys juanjoi Goin et al. 1999 marsupial | |
Perrodelphys coquinense Goin et al. 1999 metatherian | |
Polydolops dailyi metatherian
Polydolops seymouriensis metatherian | |
Cephalopoda | |
Euciphoceras argentinae Del Valle and Fourcade 1976 nautiloid |