Also known as Orthambonites dinorthoides association

Where: Nye County, Nevada (38.0° N, 116.5° W: paleocoordinates 6.2° S, 81.2° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Antelope Valley Formation (Pogonip Group), Whiterockian (470.0 - 457.3 Ma)

• "lower to mid M. Ord."

Environment/lithology: transition zone or lower shoreface; calcareous siltstone

Size class: macrofossils

Primary reference: W. B. N. Berry, D. A. Lawson, and E. S. Yancey. 1979. Species diversity patterns in some middle Ordovician communities from California-Nevada. Palaeogeography, Palaeoclimatology, Palaeoecology 26:99-116 [M. Uhen/J. Ju/J. Ju]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 423: authorized by Jack Sepkoski, entered by Mike Sommers on 03.12.1998

Creative Commons license: CC BY (attribution)