ammonites
UCMP D-5546, Murry Summit (Permian of the United States)

Where: Nevada (39.2° N, 115.0° W: paleocoordinates 13.8° N, 36.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Loray Formation, Kungurian (279.5 - 272.5 Ma)

• 240' (73 m) above base of Loray Fm.

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified wackestone and lithified packstone

• The enclosing rock consists of wackestone and packstone that was a sediment of mud or muddy sand, containing a small to moderate amount of clay and noncalcareous silt. The beds are separated by thin, clayey shale partings and are interbedded with noncarbonate strata. The coarse component consists of shell material that is broken, abraded, and sometimes well-rounded.

Size class: macrofossils

Preservation: replaced with silica

Collected by T. Yancey, L. Plas, M. Kaasa

Primary reference: T. E. Yancey and C.H. Stevens. 1981. Early Permian fossil communities in northeastern Nevada and northwestern Utah. Communitites of the Past 243-269 [T. Olszewski/M. Gibson/T. Olszewski] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 10640: authorized by Tom Olszewski, entered by Melissa Gibson on 07.06.2001, edited by Matthew Clapham and Pete Wagner