Where: Clallam County, Washington (48.3° N, 124.3° W: paleocoordinates 48.0° N, 116.9° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Clallam Formation, Aquitanian (23.0 - 20.4 Ma)
• About 110 m above the base of the Clallam. The Clallam Formation is the type for the Pacific Northwest Pillarian molluscan stage and is considered early Miocene, likely Aquitanian (Addicott, 1976a). In addition, benthic foraminifera of the Californian Saucesian stage (early Miocene, Aquitanian) are present in the Clallam Formation (Addicott, 1976b). Magnetostratigraphic studies place the Clallam Formation as latest Oligocene/earliest Miocene (Prothero et al., 2001).
• bed-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; lithified, silty sandstone
Size class: macrofossils
Preservation: mold/impression
Collected by Hannibal in 1912; reposited in the CAS
Collection methods: surface (float), surface (in situ),
• REPOSITORY: California Academy of Science.
Primary reference: W.O. Addicott. 1976. Molluscan paleontology of the lower Miocene Clallam Formation, northwestern Washington. United States Geological Survey Professional Paper 976:1-44 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 37595: authorized by Austin Hendy, entered by Austin Hendy on 17.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Acila conradi" = Acila (Truncacila) conradi
"Acila conradi" = Acila (Truncacila) conradi Meek 1864 divaricate nutclam | |
Nuculana chehalisensis Weaver 1912 pointed nut clam | |
Lucinoma acutilineata Conrad 1849 clam | |
"Macoma arctata" = Macoma (Psammacoma) arctata, "Tellina emacerata" = Tellina (Oudardia) emacerata
"Macoma arctata" = Macoma (Psammacoma) arctata Conrad 1849 tellin clam
"Tellina emacerata" = Tellina (Oudardia) emacerata Conrad 1849 tellin clam | |
Katherinella angustifrons Conrad 1849 venus clam | |
Panopea ? abrupta Conrad 1849 clam | |
"Thracia trapezoides" = Thracia (Homoeodesma) trapezoides
"Thracia trapezoides" = Thracia (Homoeodesma) trapezoides Conrad 1849 clam | |
Cephalopoda | |
Aturia angustata Conrad 1849 |