Also known as USGS M7256
Where: Aleutians East County, Alaska (54.9° N, 163.0° W: paleocoordinates 55.9° N, 161.4° W)
• coordinate stated in text
• 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 37409: 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 | |
Mya (Mya) truncata Linnaeus 1758 softshell clam | |
"Clinocardium cf. ciliatum" = Clinocardium (Ciliatocardium) ciliatum, Clinocardium cf. hannibali, Clinocardium sp., "Clinocardium cf. pristinum" = Clinocardium (Clinocardium) pristinum
"Clinocardium cf. ciliatum" = Clinocardium (Ciliatocardium) ciliatum Fabricius 1780 cockle
Clinocardium cf. hannibali cockle
Clinocardium sp. Keen 1936 cockle
"Clinocardium cf. pristinum" = Clinocardium (Clinocardium) pristinum Keen 1954 cockle | |
Macoma sp. Leach 1819 tellin clam
Macoma (Macoma) optiva tellin clam | |
"Spisula (Mactromeris) polynyma" = Mactromeris polynyma, Spisula sp.
"Spisula (Mactromeris) polynyma" = Mactromeris polynyma Stimpson 1860 clam
Spisula sp. Gray 1837 clam | |
Siliqua cf. alta Broderip and Sowerby I 1829 clam | |
"Yoldiella (Cnesterium) scissurata" = Yoldia (Cnesterium) aeolica
"Yoldiella (Cnesterium) scissurata" = Yoldia (Cnesterium) aeolica Valenciennes 1846 clam | |
Gastropoda | |
Gastropoda indet. Cuvier 1795 snail | |
Naticidae indet. Guilding 1834 moon snail | |
Buccinum cf. planeticum true whelk | |
? Oenopota candida cone shell |