Also known as Dystrophaeus type, UT-4, Moab

Where: San Juan County, Utah (38.1° N, 109.3° W: paleocoordinates 33.2° N, 54.6° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Tidwell Member (Morrison Formation), Late/Upper Oxfordian (161.2 - 155.7 Ma)

• within 1 m of lower boundary between Morrison and Wanakah Formations. Bottom of Tidwell Member, which here is within Morrison = Summerville Fm. Earlier papers often cite this as the McElmo Formation; Newberry (1876) called it the "Gypsum formation."

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; lithified sandstone

Size class: macrofossils

Collected by J. S. Newberry in 1859; 1989; 2007-; reposited in the UNSM

Collection methods: quarrying, mechanical,

• Site revisited in 1989 and more of original specimen found and excavated. Originally discovered by J. S. Newberry as part of the Macomb Expedition in 1859.

Primary reference: J. S. Newberry. 1876. Geological Report. In J. N. Macomb (ed.), Report of the Exploring Expedition from Santa Fé, New Mexico, to the Junction of the Grand and Green Rivers of the Great Colorado of the West, in 1859, Under the Command of Capt. J. N. Macomb, Corps of Topographical Engineers (Now Colonel of Engineers); with Geological Report 1-118 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28360: authorized by Matthew Carrano, entered by Matthew Carrano on 10.02.2003

Creative Commons license: CC BY (attribution)