Also known as USGS M7150
Where: Aleutians East County, Alaska (54.8° N, 163.4° W: paleocoordinates 55.8° 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 37407: 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 | |
"Yoldiella (Cnesterium) scissurata" = Yoldia (Cnesterium) aeolica
"Yoldiella (Cnesterium) scissurata" = Yoldia (Cnesterium) aeolica Valenciennes 1846 clam | |
"Acila (Truncacila) cf. empirensis" = Acila (Truncacila) castrensis
"Acila (Truncacila) cf. empirensis" = Acila (Truncacila) castrensis Hinds 1843 divaricate nutclam | |
Mizuhopecten mollerensis scallop | |
Clinocardium hannibali, Clinocardium sp., "Clinocardium meekianum" = Clinocardium (Clinocardium) meekianum
Clinocardium hannibali cockle
Clinocardium sp. Keen 1936 cockle
"Clinocardium meekianum" = Clinocardium (Clinocardium) meekianum Gabb 1866 cockle | |
Macoma optiva, Macoma sp., Macoma (Macoma) cf. astori, Macoma (Macoma) golikovi, "Peronidia (aff. Peronidia) lutea" = Tellina (Megangulus) lutea
Macoma optiva tellin clam
Macoma sp. Leach 1819 tellin clam
Macoma (Macoma) cf. astori Dall 1909 tellin clam
Macoma (Macoma) golikovi Scarlato and Kafanov 1988 tellin clam
"Peronidia (aff. Peronidia) lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam Subspecies: Peronidia aff. P. lutea alternidentata
| |
"Spisula (Mactromeris) brevirostrata" = Mactromeris brevirostrata, "Spisula (Mactromeris) polynyma" = Mactromeris polynyma, Spisula sp.
"Spisula (Mactromeris) brevirostrata" = Mactromeris brevirostrata Packard 1916 clam
"Spisula (Mactromeris) polynyma" = Mactromeris polynyma Stimpson 1860 clam
Spisula sp. Gray 1837 clam | |
Siliqua cf. alta Broderip and Sowerby I 1829 clam | |
Panomya trapezoidis clam | |
Gastropoda | |
Gastropoda indet. Cuvier 1795 snail | |
Naticidae indet. Guilding 1834 moon snail
Natica (Tectonatica) janthostoma Deshayes 1839 moon snail | |
Oenopota cf. candida cone shell | |
Buccinum cf. planeticum true whelk
Beringius hertleini true whelk
Neptunea (Neptunea) aff. modesta true whelk |