Jack Valley Member, Great Basin, Tony Grove Lake (Silurian to of the United States)

Where: Utah (39.3° N, 114.9° W: paleocoordinates 10.1° S, 69.2° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Jack Valley Member (Laketown Dolomite Formation), Telychian to Telychian (438.5 - 427.4 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; black, brown, gray dolomite

• brownish-black to medium brownish-gray, weathering brownish gray to light brownish gray, microcrystalline to very finely crystalline dolostone that is thin- to very thick-bedded and partly laminated.

Collection methods: bulk, hydrochloric,

Primary reference: P. M. Sheehan. 1982. Late Ordovician and Silurian of the eastern Great Basin Part 4. Late Llandovery and Wenlock brachiopods. Milwaukee Public Museum Contributions in Biology and Geology 50:1-73 [M. Patzkowsky/Z. Krug/Z. Krug]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 51559: authorized by Mark Patzkowsky, entered by Zack Krug on 08.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Rhynchonellata
 Spiriferida - Reticulariidae
 Rhynchonellida - Trigonirhynchiidae