Where: Millard County, Utah (38.7° N, 114.0° W: paleocoordinates 5.3° N, 40.2° W)

• coordinate estimated from map

When: Desmoinesian to Desmoinesian (312.8 - 306.0 Ma)

• The writer has placed the lower contact at the top of a brown crinoidal limestone unit of the Illipah Formation. The contact with the overlying Permian Arcturus Formation appears to be gradational in localities. The massive Ely limestones grade into thin bedded, shaly limestones whcih contain species fo "Schwagerina" and "Pseudoschwagerina", lower Wolfcampian fusulinids. The upper contact is placed approximately 600ft. above the first appearance of Wolfcampian fusulinids, at the beginning of the first sandstone units of the Arcturus Formation.

Environment/lithology: limestone and ooidal, sandy limestone

Collection methods: The fossils in the lower units are partially silicified forms which weather free. The fossils in the middle units occur as encrinites and poorly preserved hash.

Primary reference: W. J. Gould. 1959. Geology of the Northern Needle Range Millard County, Utah. Brigham Young University Research Studies, Geology Series 6(5):1-47 [T. Olszewski/M. Gibson/L. Fall]more details

PaleoDB collection 13364: authorized by Tom Olszewski, entered by Melissa Gibson on 10.03.2002

Creative Commons license: CC BY (attribution)