USGS #15588 - Pittsburg Bluff Formation (Oligocene of the United States)

Where: Columbia County, Oregon (45.8° 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 Scappoose 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

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

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 37691: authorized by Austin Hendy, entered by Austin Hendy on 20.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Very complete for mollusca.
Bivalvia
 Cardiida - Mactridae
"Spisula (? Mactromeris) veneriformis" = Mactromeris, "Spisula (Mactromeris) pittsburgensis" = Mactromeris pittsburgensis
"Spisula (? Mactromeris) veneriformis" = Mactromeris clam
"Spisula (Mactromeris) pittsburgensis" = Mactromeris pittsburgensis Clark 1925 clam
 Cardiida - Veneridae
"Callista (Macrocallista) pittsburgensis" = Macrocallista pittsburgensis
"Callista (Macrocallista) pittsburgensis" = Macrocallista pittsburgensis Dall 1900 venus clam
 Cardiida - Tellinidae
? Tellina pittsburgensis, "Tellina (Eurytellina) aduncanasa" = Eurytellina
"Tellina (Eurytellina) aduncanasa" = Eurytellina tellin clam
 Hiatellida - Hiatellidae
Panopea ramonensis Clark 1925 clam
 Solenida - Solenidae
 Thraciida - Periplomatidae
"Cochlodesma bainbridgensis" = Aperiploma bainbridgensis
"Cochlodesma bainbridgensis" = Aperiploma bainbridgensis Clark 1925 clam
 Thraciida - Thraciidae
"Thracia (Thracia) condoni" = Thracia (Cetothrax) condoni
"Thracia (Thracia) condoni" = Thracia (Cetothrax) condoni Dall 1909 clam
 Lucinida - Lucinidae
Lucinoma columbiana Clark and Arnold 1923 clam
 Nuculida - Nuculidae
Nucula (Leionucula) vokesi Moore 1976 nut clam
Acila (Truncacila) shumardi Dall 1909 divaricate nutclam
 Protobranchia - Nuculanidae
Litorhadia washingtonensis Weaver 1916 pointed nut clam
Gastropoda
 Ptenoglossa - Epitoniidae
Opalia (? Dentiscala) hertleini Moore 1976 wentletrap
 Cephalaspidea - Cylichnidae
Scaphander stewarti Durham 1944 snail
 Neogastropoda - Buccinidae
Molopophorus gabbi Dall 1909 true whelk
 Neogastropoda - Fasciolariidae
Priscofusus stewarti Tegland 1933 snail
Perse pittsburgensis Durham 1944 snail
 Neogastropoda - Drilliidae
Spirotropis kincaidi Weaver 1916 snail
 Naticoidea - Naticidae
Cryptonatica pittsburgensis Moore 1976 moon snail
Polinices washingtonensis Weaver 1916 moon snail
Neverita (Glossaulax) thomsonae Hickman 1969 moon snail
 Sorbeoconcha - Turritellidae
Turritella pittsburgensis Moore 1976 turret shell
 Architectibranchia - Acteonidae
Acteon sp. n. sp. Montfort 1810 snail
Acteon chehalisensis Weaver 1916 snail
  - Neptuneidae
Eosiphonalia oregonensis Dall 1909 snail
Bruclarkia columbiana Anderson and Martin 1914 snail
 Architectonicoidea - Architectonicidae
Architectonica blanda Dall 1909 sundial
Scaphopoda
 Dentaliida - Dentaliidae