Also known as CAS 60278
Where: Aleutians East County, Alaska (54.9° N, 163.4° W: paleocoordinates 55.9° N, 161.8° 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 37411: authorized by Austin Hendy, entered by Austin Hendy on 14.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Beringius hertleini true whelk | |
Bivalvia | |
"Acila (Truncacila) empirensis" = Acila (Truncacila) castrensis
"Acila (Truncacila) empirensis" = Acila (Truncacila) castrensis Hinds 1843 divaricate nutclam | |
"cf. Chlamys (Swiftopecten) cosibensis" = Chlamys (Chlamys) cosibensis
"cf. Chlamys (Swiftopecten) cosibensis" = Chlamys (Chlamys) cosibensis Yokoyama 1911 scallop Subspecies: Chlamys (Swiftopecten) cosibensis cosibensis
| |
Clinocardium sp. Keen 1936 cockle | |
"Peronidia aff. lutea" = Tellina (Megangulus) lutea, Macoma (Macoma) optiva
"Peronidia aff. lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam Subspecies: Peronidia aff. P. lutea alternidentata
Macoma (Macoma) optiva tellin clam | |
Cyclocardia sp. Conrad 1867 clam |