USGS #M3869 - Pittsburg Bluff Formation (Oligocene of the United States)

Where: Washington County, Oregon (45.7° N, 123.2° W: paleocoordinates 45.4° N, 114.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pittsburg Formation, Chattian (28.1 - 23.0 Ma)

• Near top of formation. The Pittsburg Bluff Formation conformably overlies the Keasey Formation (late Eocene and early Oligocene) and is conformably overlain by the Scappose Formation (late Oligocene and early Miocene). Parts of the formation are lithologically similar and therefore the stratigraphic position of exposures are sometimes uncertain. The estimated thickness for the entire formation is 200 ml the thickest continuous section of the formation is 100 m thick.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, concretionary, gray sandstone

• Massive olive-gray fine-grained sandstone, with concretions, trough shaped prisms, silstone rip-up clasts.

Size class: macrofossils

Reposited in the CAS, UCMP, UW

Collection methods: quarrying,

• Material housed in the USGS, Menlo Park. Also collections from UCMP, CAS, Stanford University (SU), University of Washington (UW), University of Oregon (UO), and the Academy of Natural Sciences of Philadelphia (ANSP)

Primary reference: E. J. Moore. 1976. Oligocene marine mollusks from the Pittsburg Bluff Formation in Oregon. United States Geological Survey Professional Paper 922:1-66 [A. Miller/A. Hendy/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 37695: authorized by Austin Hendy, entered by Austin Hendy on 21.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Very complete for mollusca
Bivalvia
 Cardiida - Mactridae
"Spisula (Mactromeris) pittsburgensis" = Mactromeris pittsburgensis
"Spisula (Mactromeris) pittsburgensis" = Mactromeris pittsburgensis Clark 1925 clam
 Cardiida - Veneridae
"Callista (Macrocallista) cf. pittsburgensis" = Macrocallista pittsburgensis
"Callista (Macrocallista) cf. pittsburgensis" = Macrocallista pittsburgensis Dall 1900 venus clam
 Protobranchia - Nuculanidae
Litorhadia cf. washingtonensis Weaver 1916 pointed nut clam