USGS #M3858 - Pittsburg Bluff Formation (Oligocene of the United States)

Where: Columbia County, Oregon (45.8° N, 123.0° W: paleocoordinates 45.5° N, 114.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• Near top of Pittsburg Bluff 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, UMMP, 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 37692: authorized by Austin Hendy, entered by Austin Hendy on 21.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Very complete for mollusca
 Cardiida - Mactridae
"Spisula (Mactromeris) pittsburgensis" = Mactromeris pittsburgensis
"Spisula (Mactromeris) pittsburgensis" = Mactromeris pittsburgensis Clark 1925 clam
 Cardiida - Ungulinidae
 Cardiida - Veneridae
"Callista (Macrocallista) pittsburgensis" = Macrocallista pittsburgensis
"Callista (Macrocallista) pittsburgensis" = Macrocallista pittsburgensis Dall 1900 venus clam
 Cardiida - Tellinidae
"Tellina (Eurytellina) aduncanasa" = Eurytellina
"Tellina (Eurytellina) aduncanasa" = Eurytellina tellin clam
 Solenida - Solenidae
 Lucinida - Lucinidae
Lucinoma columbiana Clark and Arnold 1923 clam
 Cephalaspidea - Cylichnidae
Scaphander stewarti Durham 1944 snail
 Neogastropoda - Buccinidae
Molopophorus gabbi Dall 1909 true whelk
 Neogastropoda - Fasciolariidae
Perse pittsburgensis Durham 1944 snail
 Naticoidea - Naticidae
Neverita (Glossaulax) thomsonae Hickman 1969 moon snail
 Architectibranchia - Acteonidae
? Acteon sp. n. sp.
? Acteon sp. n. sp. Montfort 1810 snail
  - Neptuneidae
Bruclarkia columbiana Anderson and Martin 1914 snail
 Architectonicoidea - Architectonicidae
Architectonica blanda Dall 1909 sundial
 Dentaliida - Dentaliidae