Also known as USGS M7139
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 Flase 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 37398: 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 (Arenomya) elegans Eichwald 1871 softshell clam | |
Spisula sp., "Spisula (Mactromeris) albaria" = Mactromeris albaria
Spisula sp. Gray 1837 clam
"Spisula (Mactromeris) albaria" = Mactromeris albaria Conrad 1848 clam | |
"Felaniella parilis" = Diplodonta parilis
"Felaniella parilis" = Diplodonta parilis Conrad 1848 clam | |
Saxidomus sp. Conrad 1837 venus clam | |
Macoma sp., "Peronidia aff. lutea" = Tellina (Megangulus) lutea
Macoma sp. Leach 1819 tellin clam
"Peronidia aff. lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam Subspecies: Peronidia aff. P. lutea alternidentata
| |
Clinocardium sp. Keen 1936 cockle | |
"Pandora (Pandorella) grandis" = Pandora (Pandorella) wardiana
"Pandora (Pandorella) grandis" = Pandora (Pandorella) wardiana Adams 1860 clam | |
Glycymeris grewingki Dall 1909 clam | |
"Chlamys (Swiftopecten) cosibensis" = Chlamys (Chlamys) cosibensis
"Chlamys (Swiftopecten) cosibensis" = Chlamys (Chlamys) cosibensis Yokoyama 1911 scallop Subspecies: Chlamys (Swiftopecten) cosibensis cosibensis
| |
Gastropoda | |
Fusitriton oregonensis Redfield 1846 triton shell | |
Oenopota sp. Mörch 1852 cone shell | |
Buccinum sp. Linnaeus 1758 true whelk
Neptunea sp. Röding 1798 true whelk
Neptunea (Neptunea) aff. modesta true whelk | |
Polinices (Euspira) pallidus, "Natica (Cryptonatica) clausa" = Cryptonatica affinis
Polinices (Euspira) pallidus Broderip 1829 moon snail
"Natica (Cryptonatica) clausa" = Cryptonatica affinis Gmelin 1791 moon snail |