Stike's Quarry (Cretaceous of the United States)

Also known as Utahraptor Ridge, Stikes Quarry

Where: Grand County, Utah (38.8° N, 109.7° W: paleocoordinates 37.2° N, 59.1° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• upper part of member

•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.

• bed-level stratigraphic resolution

Environment/lithology: mire or swamp; sandstone and mudstone

• "a large collapsed dewatering feature formed on the margin of Lake Madsen and thus is the first dinosaur site ever to be attributed to trapping by “quicksand”"
• "a series of interconnected sandstone masses (“blobs”) that encased unfossiliferous floodplain-derived mudstone beds with carbonate nodules"

Size class: macrofossils

Collected by Stike; reposited in the TMP

Collection methods: quarrying, surface (in situ),

Primary reference: J. S. Tweet, V. L. Santucci, T. Connors and J. P. Kenworthy. 2012. Paleontological Resource Inventory and Monitoring: Northern Colorado Plateau Network. National Park Service Technical Report NPS/NCPN/NRTR—2012/585 xii-524 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 24894: authorized by Matthew Carrano, entered by Matthew Carrano on 22.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Ornithischia - Iguanodontidae
Iguanodontidae indet. Bonaparte 1850 iguanodontid
1 juvenile, 1 adult
 Theropoda -
Theropoda indet. Marsh 1881 theropod
 Theropoda - Dromaeosauridae
Utahraptor sp. Kirkland et al. 1993 maniraptoran
3 "yearlings, 5 juveniles, 1 adult