Also known as M1178
Where: Aleutians East County, Alaska (55.7° N, 160.2° W: paleocoordinates 58.8° N, 154.0° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Stepovak Formation, Oligocene (33.9 - 23.0 Ma)
• Also within the type area of the Stepovak Formation ("series"). The Stepovak Formation reaches around 6500 ft in thickness and comprises sandstones and siltstones. Collection probably middle or early Oligocene. Collection from near middle of formation at base of unit 3.
• bed-level stratigraphic resolution
Environment/lithology: marine; brown, gray sandstone and black siltstone
Size class: macrofossils
Collection methods: Collections examined by F.S. MacNeil and D. Taylor (USGS), 1962. Collections are reposited at USGS Menlo Park, or presumably USNM (not reported)
Primary reference: C.A. Burk. 1965. Geology of the Alaska Peninsula-island arc and continental margin (Part 1). Geological Society of America Memoir 99(1) [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 44106: authorized by Austin Hendy, entered by Austin Hendy on 01.09.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Acila aff. shumardi" = Acila (Truncacila) shumardi
"Acila aff. shumardi" = Acila (Truncacila) shumardi Dall 1909 divaricate nutclam Also A. aff. praedivaricata
| |
Yoldia sp. Möller 1842 clam | |
Chlamys ashiynensis scallop | |
Ostrea sp. Linnaeus 1758 oyster | |
Spisula cf. callistaeformis Dall 1904 clam | |
? Mya sp. Linnaeus 1758 softshell clam | |
Thyasira sp. Lamarck 1818 clam | |
Scaphopoda | |
Dentalium sp. Linnaeus 1758 tusk shell | |
Gastropoda | |
? Natica sp. Scopoli 1777 moon snail |