Vernonia (15132) (Oligocene of the United States)

Also known as USGS 15132

Where: Columbia County, Oregon (45.8° N, 123.2° W: paleocoordinates 45.5° N, 112.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pittsburg Bluff Formation, Rupelian (33.9 - 28.1 Ma)

• Middle 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 37702: 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 - Tellinidae
? Tellina pittsburgensis, "Tellina (Eurytellina) aduncanasa" = Eurytellina
"Tellina (Eurytellina) aduncanasa" = Eurytellina tellin clam
 Nuculida - Nuculidae
Acila (Truncacila) shumardi Dall 1909 divaricate nutclam
Gastropoda
 Neogastropoda - Buccinidae
Molopophorus gabbi Dall 1909 true whelk
 Neogastropoda - Fasciolariidae
Perse pittsburgensis Durham 1944 snail
 Naticoidea - Naticidae
Cryptonatica pittsburgensis Moore 1976 moon snail
  - Neptuneidae
Bruclarkia columbiana Anderson and Martin 1914 snail