Also known as USGS M7142
Where: Aleutians East County, Alaska (55.0° N, 162.8° W: paleocoordinates 56.0° N, 161.2° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Tachilni Formation, Tortonian (11.6 - 7.2 Ma)
• Formation crops out continuously from the coast west of Cape Tachilni from Morzhovoi Bay to False Pass and possibly of Deer Island. Thickness of the Tachilni Fm is not known because its base is not exposed, but is estimated to be as much as 460 m thick, although not more than 250 m and any outcrop. Disconformably overlies volcaniclastic Belkofski Fm, and is unconformably overlain by Pliocene-Holocene volacanic flows and breccia.
• bed-level stratigraphic resolution
Environment/lithology: coastal; fine-grained, medium, brown, gray sandstone
Size class: macrofossils
Reposited in the CAS, USNM
Collection methods: quarrying,
• Also collections at University of Alaska (UA), Fairbanks, Alaska
Primary reference: L. Marincovich. 1983. Molluscan paleontology, paleoecology, and North Pacific correlations of the Miocene Tachilni Formation, Alaska Peninsula, Alaska. Bulletin of American Paleontology 84(317):1-155 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 37402: authorized by Austin Hendy, entered by Austin Hendy on 14.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Bivalvia indet. Linnaeus 1758 clam | |
Crenomytilus coalingensis Arnold 1909 mussel | |
Glycymeris grewingki Dall 1909 clam | |
"Peronidia (Peronidia) lutea" = Tellina (Megangulus) lutea, Macoma sp., Macoma (Macoma) golikovi, Macoma (Macoma) astori
"Peronidia (Peronidia) lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam Subspecies: Peronidia aff. P. lutea alternidentata
Macoma sp. Leach 1819 tellin clam
Macoma (Macoma) golikovi Scarlato and Kafanov 1988 tellin clam
Macoma (Macoma) astori Dall 1909 tellin clam | |
"Felaniella parilis" = Diplodonta parilis
"Felaniella parilis" = Diplodonta parilis Conrad 1848 clam | |
"Protothaca (Protothaca) staleyi" = Leukoma staleyi
"Protothaca (Protothaca) staleyi" = Leukoma staleyi Gabb 1866 venus clam | |
Mya (Mya) truncata Linnaeus 1758 softshell clam | |
Lyonsia mooreae clam | |
Miodontiscus prolongatus Carpenter 1864 clam |