Where: Antarctica (64.3° S, 56.7° W: paleocoordinates 63.4° S, 63.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Telm 1 Member (La Meseta Formation), Ypresian (56.0 - 47.8 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. Amenábar 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 Amenábar et al. (2019) is used here.

•See Kloess et al. 2020 for useful breakdown of stratigraphy of the La Peseta Formation

• group of beds-level stratigraphic resolution

Environment/lithology: prodelta; ferruginous, gray, sandy siltstone and sandstone

Size class: macrofossils

Collection methods: peel or thin section,

Primary reference: J. Stolarski. 1996. Paleogene corals from Seymour Island, Antarctic Peninsula. Palaeontologia Polonica 55:51-63 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 75456: authorized by Wolfgang Kiessling, entered by Uta Merkel on 10.10.2007, edited by Marko Manojlovic and Matthew Clapham

Creative Commons license: CC BY (attribution)