Also known as University of Alaska A-170
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 37415: authorized by Austin Hendy, entered by Austin Hendy on 14.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Margarites (Pupillaria) sp. Dall 1909 snail | |
Calyptraea sp. Lamarck 1799 slipper shell | |
"Natica (Cryptonatica) clausa" = Cryptonatica affinis
"Natica (Cryptonatica) clausa" = Cryptonatica affinis Gmelin 1791 moon snail | |
Neptunea (Neptunea) aff. modesta true whelk
Beringius hertleini true whelk | |
Bivalvia | |
"Chlamys (Swiftopecten) cosibensis" = Chlamys (Chlamys) cosibensis
"Chlamys (Swiftopecten) cosibensis" = Chlamys (Chlamys) cosibensis Yokoyama 1911 scallop Subspecies: Chlamys (Swiftopecten) cosibensis cosibensis
| |
Glycymeris grewingki Dall 1909 clam | |
Clinocardium hannibali, "Clinocardium meekianum" = Clinocardium (Clinocardium) meekianum
Clinocardium hannibali cockle
"Clinocardium meekianum" = Clinocardium (Clinocardium) meekianum Gabb 1866 cockle | |
"Peronidia aff. lutea" = Tellina (Megangulus) lutea, Macoma (Macoma) optiva, Macoma (Macoma) cf. astori
"Peronidia aff. lutea" = Tellina (Megangulus) lutea Gray 1828 tellin clam Subspecies: Peronidia aff. P. lutea alternidentata
Macoma (Macoma) optiva tellin clam
Macoma (Macoma) cf. astori Dall 1909 tellin clam | |
"Felaniella parilis" = Diplodonta parilis
"Felaniella parilis" = Diplodonta parilis Conrad 1848 clam | |
Chama sp. Linnaeus 1758 jewel box | |
"Spisula (Mactromeris) brevirostrata" = Mactromeris brevirostrata, "Spisula (Mactromeris) albaria" = Mactromeris albaria
"Spisula (Mactromeris) brevirostrata" = Mactromeris brevirostrata Packard 1916 clam
"Spisula (Mactromeris) albaria" = Mactromeris albaria Conrad 1848 clam | |
Mya (Mya) truncata Linnaeus 1758 softshell clam
Mya (Arenomya) elegans Eichwald 1871 softshell clam | |
Cyclocardia sp. Conrad 1867 clam |