Where: Wyoming (43.9° N, 109.7° W: paleocoordinates 48.7° N, 93.3° W)
• coordinate estimated from map
• local area-level geographic resolution
When: Laney Member (Green River Formation), Early/Lower Eocene (55.8 - 48.6 Ma)
• Walter et al. 2021: The presence of Gosiutichthys parvus fossil fish on specimen SMNK-PAL 2334 confirms the specimen came from the Laney member (49.25 Ma) of the Lake Gosiute deposits of the Green River Formation. The yellow matrix of both specimens and quality of preservation of the fossil fish suggest they were found in 18-mile Canyon area of Lake Gosiute deposits although it is possible they came from the Farson Fish Beds. The Layered Tuff below the Laney Member was dated at 50.1 ± 0.09 Ma and the Analcine Tuff near the top was dated at 49.25 ± 0.12 Ma (Smith et al. 2008, 2010). These dates place Laney Member deposition at the waning end of the Early Eocene Climatic Optimum (EECO) (Inglis et al. 2020; Figure 1 in Birgenheier et al., 2019).
• group of beds-level stratigraphic resolution
Environment/lithology: lacustrine; yellow lithology not reported
Size class: macrofossils
Collection methods: SMNK – Staatliches Museum für Naturkunde, Germany, Karlsruhe;
Primary reference: J. Walter, G. Darlim, T. Massonne, A. Aase, E. Frey and M. Rabi. 2021. On the origin of Caimaninae: insights from new fossils of Tsoabichi greenriverensis and a review of the evidence. Historical Biology [P. Mannion/G. Varnham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 224132: authorized by Philip Mannion, entered by Grace Varnham on 19.01.2022
Creative Commons license: CC BY (attribution)
Taxonomic list
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Tsoabichi greenriverensis Brochu 2010 crocodilian SMNK-PAL 2333a–SMNK-PAL 2333b, articulated skeleton of a single juvenile individual recovered in two slabs (Figure 2A-Figure 2B); SMNK-PAL 2334, articulated skeleton of a juvenile individual (Figure 2C)
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