Also known as Martin Bridge Limestone

Where: Oregon (45.0° N, 116.0° W: paleocoordinates 19.1° N, 52.4° W)

• coordinate stated in text

• small collection-level geographic resolution

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

• On a regional scale, the Martin Bridge Limestone can be characterized as a discontinuously preserved Carnian-Norian carbonate unit that occurs in northeastern Oregan and western Idaho. The Martin Bridge overlies the Seven Devils Group in apparent unconformable contact and is in turn stratigraphically overlain by the Late Triassic-Early Jurassic shale and limestone of the Hurwal Fromation.

•JA: from the early Norian Mojsisovicsites kerri Zone

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified limestone

Size class: macrofossils

Preservation: replaced with silica

Primary reference: C. R. Newton, M. T. Whalen, J. B. Thompson, N. Prins, and D. Delallia. 1987. Systematics and paleoecology of Norian (Late Triassic) bivalves from a tropical island arc: Wallowa Terrane, Oregan. Memoir - Paleontological Society 22:1-83 [D. Bottjer/N. Bonuso/S. Kolbe]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 33294: authorized by David Bottjer, entered by Nicole Bonuso on 24.07.2003, edited by Bethany Allen

Creative Commons license: CC BY (attribution)