Where: Grand County, Utah (38.8° N, 109.6° W: paleocoordinates 37.2° N, 59.1° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Yellow Cat Member (Cedar Mountain Formation), Valanginian (139.8 - 132.9 Ma)

• The age of the base of the YCM is unknown and estimates range from Berrisian to early Aptian. Britt et al. 2007 suggested a maximum depositional age for the YCM of ~124Ma, but Sames et al. 2010 suggested on the basis of ostracod biostratigraphy the YCM may be as old as Late Berrisian. Hendrix et al. 2015 and Joeckel et al. 2019 supported this with U-Pb dates from detrital zircons, the latter study suggested that the upper YCM is Valanginian. At any rate, the age of the overlying Poison strip member was dated at its base to 119.4Ma, so the YCM is older than this.

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by G. Sperry

Collection methods: surface (in situ),

Primary reference: G. Sperry. 1957. Collecting gizzard stones in Utah. Desert Magazine 20(7):4-5 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 190355: authorized by Matthew Carrano, entered by Matthew Carrano on 05.12.2017

Creative Commons license: CC BY (attribution)