Where: Columbia County, Oregon (45.9° N, 123.2° W: paleocoordinates 45.5° N, 114.2° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Pittsburg Bluff Formation, Chattian (28.1 - 23.0 Ma)
• Upper part of Pittsburg Fm. 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: offshore; poorly lithified, fine-grained, concretionary, gray sandstone
Size class: macrofossils
Reposited in the USGS
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 37683: authorized by Austin Hendy, entered by Austin Hendy on 20.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Pitar (Pitar) dalli Weaver 1916 venus clam | |
Felaniella (Felaniella) snavelyi Moore 1976 clam | |
"Spisula (? Mactromeris) veneriformis" = Mactromeris
"Spisula (? Mactromeris) veneriformis" = Mactromeris clam | |
Panopea snohomishensis Clark 1925 clam | |
Yoldia (Kalayoldia) oregona Shumard 1858 clam |