Where: Oregon (45.1° N, 116.8° W: paleocoordinates 19.3° N, 53.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Martin Bridge Limestone Formation, Lacian (221.5 - 215.6 Ma)

• Martin Bridge overlies the Seven Devils Group

•JA: originally entered as Norian but "earliest Norian" (= Lacian) according to the author based on the presence of Tropiceltites columbianus in this unit

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; peloidal, shelly/skeletal grainstone and peloidal, shelly/skeletal wackestone

Size class: macrofossils

Preservation: replaced with silica

Collection methods: chemical

• material is from U.S. Geological Survey Mesozoic collection M2672 made by Trace Vallier in 1964

Primary reference: C. R. Newton. 1983. Late Triassic Bivalves of the Martin Bridge Limestone, Hells Canyon, Oregon: Taphonomy, Paleoecology, Paleozoogeography. United States Geological Survey Professional Paper 1435.2:7-22 [M. Aberhan/S. Nurnberg/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 36755: authorized by Martin Aberhan, entered by Sabine Nürnberg on 12.02.2004, edited by Pete Wagner

Creative Commons license: CC BY (attribution)