Also known as 77AM22
Where: Alaska (55.2° N, 161.6° W: paleocoordinates 56.7° N, 159.0° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Bear Lake Formation, Middle Miocene (16.0 - 11.6 Ma)
• STRATIGRAPHIC RELATIONS: From Bear Lake Fm, which is presumed to overlie the Stepovak Fm (Paleogene), though the contact is not exposed. AGE: Middle Miocene. 15-16 Mas, or earliest Middle Miocene based on the presence of Turritella (Hataiella) sagai. This is the greatest known age for any Bear Lake outcrop. An overlying andesitic flow has been radiometrically dated at 10.4 Ma. STRATIGRAPHIC POSITION: Unknown position within formation.
• bed-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; lithified, coarse-grained sandstone
Size class: macrofossils
Reposited in the LACM, USNM
Collection methods: quarrying,
• COLLECTOR: L. Marincovich, Jr (1977). REPOSITORY: USGS (Menlo Park), LACM, USNM
Primary reference: L. Marincovich. 1988. Recognition of an earliest Middle Miocene warm-water event in a southestern Alaskan molluscan fauna. Saito-Ho-on Kai Special Publication 1:1-24 [A. Hendy/A. Hendy/P. Wagner]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 67916: authorized by Austin Hendy, entered by Austin Hendy on 16.12.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Scaphopoda | |
Dentalium (Rhabdus) cf. schencki Moore 1963 tusk shell | |
Gastropoda | |
Tyrannoberingius rex Marincovich 1981 snail | |
Turritella (Hataiella) sagai Kotaka 1951 turret shell | |
Beringius crebricostatus Dall 1877 true whelk | |
Bivalvia | |
Mytilus (Plicatomytilus) gratacapi Allison and Addicott 1976 mussel | |
Macoma sp. Leach 1819 tellin clam | |
Penitella sp. Valenciennes 1846 clam | |
Thracia sp. Blainville 1824 clam | |
Lucinoma acutilineata Conrad 1849 clam |