Also known as USGS M7258
Where: Aleutians East County, Alaska (55.0° N, 163.2° W: paleocoordinates 56.0° N, 161.6° 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 37410: authorized by Austin Hendy, entered by Austin Hendy on 14.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Buccinum cf. planeticum true whelk
Neptunea sp. Röding 1798 true whelk | |
Bivalvia | |
"Spisula (Mactromeris) polynyma" = Mactromeris polynyma
"Spisula (Mactromeris) polynyma" = Mactromeris polynyma Stimpson 1860 clam | |
"Clinocardium ex gr. pristinum" = Clinocardium (Clinocardium) pristinum
"Clinocardium ex gr. pristinum" = Clinocardium (Clinocardium) pristinum Keen 1954 cockle | |
Macoma sp. Leach 1819 tellin clam | |
Musculus (Musculus) niger Gray 1824 mussel |