Where: Elko County, Nevada (41.3° N, 114.3° W: paleocoordinates 11.9° N, 37.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Thaynes Formation, Spathian (251.3 - 247.2 Ma)

• At the sample site in Montello Canyon, no ammonoids or other marine organisms were found thus far. The Thaynes Group also directly overlies the Dinwoody Formation, implying that both units are probably incomplete. However, by comparison with the geographically close Immigrant Canyon, most of the basal part of the Thaynes Group was preserved in Montello Canyon indicating that these exposures are middle-upper Spathian (thicker limestone beds of the upper part are also found above in the section). The sampled slab was located on the slope of a hill where the lower part of the Thaynes Group outcrops, just above the contact between the Dinwoody Formation and the Thaynes Group. It is thus middle-late Spathian in age (late Olenekian, Early Triassic).

• bed-level stratigraphic resolution

Environment/lithology: lithified, calcareous shale

Size class: macrofossils

Collection methods: Repository: Université de Bourgogne, Géologie Dijon (UBGD)

Primary reference: T. Saucède, C. Smith, N. Olivier, C. Durlet, P. Gueriau, M. Thoury, E. Fara, G. Escarguel, and A. Brayard. 2023. A new Early Triassic crinoid from Nevada questions the origin and palaeobiogeographical history of dadocrinids. Acta Palaeontologica Polonica 68:155-166 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 229859: authorized by Matthew Clapham, entered by Matthew Clapham on 05.04.2023

Creative Commons license: CC BY (attribution)