ammonites
North Muddy Mountains 12.75 m, Moenkopi Formation, Virgin Limestone Member (Triassic of the United States)

Where: Nevada (36.5° N, 114.6° W: paleocoordinates 7.9° N, 40.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Virgin Limestone Member (Moenkopi Formation), Spathian (251.3 - 247.2 Ma)

• lower Virgin Limestone Member

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified siltstone and lithified sandstone

• distal storm beds
• laminated muddy siltstones with thin fine- or very fine-grained sandstones

Size class: macrofossils

Primary reference: R. J. Twitchett, J. M. Feinberg, D. D. O'Connor, W. Alvarez, and L. B. McCollum. 2005. Early Triassic Ophiuroids: their paleoecology, taphonomy and distribution. Palaios 20:213-223 [W. Kiessling/U. Merkel] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 61820: authorized by Wolfgang Kiessling, entered by Uta Merkel on 03.07.2006