Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Miocene
Kinds of fossils: Mollusks, sand dollar echinoids
Quadrangle or area: Chignik (A-5) and (C-2) Quadrangles, Peninsula
Shipment No.: A-78-15M
Referred by: Detterman, Robert L.
Report prepared by: Marincovich, Louie , Jr.
Date: 02/27/1978

This report deals with 6 collections of megainvertebrates from the Bear Lake Formation of the Alaska Peninsula, southwestern Alaska. Some of the localities are newly discovered fossil beds.


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Brief statement of problem and remarks (from collector):
Abundant, well preserved fossils from several new localities on the Alaska Peninsula. The echinoids should pin down the exact position of the Bear Lake Fm. Also, should help build up reference collections for this age rocks in Alaska.

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77-ADt-86A (Cenozoic loc. M7180) , Chignik , Well bedded volcanic sand and conglomerate, volcanic breccia, and tuff; position in section unknown; 10.25 miles N30E of Ivanof Bay Cannery, T. 48 S., R. 65 W., Chignik (A-5) Quadrangle; latitude 56 deg. 01 min. 47 sec. N; longitude 159 deg. 21 min. 35 sec. W.
Ostrea sp.
77-ADt-87 (Cenozoic loc. M7181) , Chignik , Interbedded volcanic sandstone, conglomerate, siltstone and shale; upper part of section; 7.4 miles N03E of Ivanof Bay Cannery, T. 48 S., R. 65 W., Chignik (A-5) Quadrangle; latitude 56 deg. 00 min. 27 sec. N; longitude 159 deg. 28 min. 53 sec W.
Thyasira disjuncta (Gabb)
?Pandora sp. - 1 fragment
Papyridea cf. P. harrimani Dall - 2 fragments & 1 articulated pair
Nucula sp. - 2 fragments
Acila (Truncacila) empirensis Howe - 5 valves
Fortipecten mollerensis MacNeil - several fragments
Mya (Mya) truncata Linnaeus - 2 articulated fragments
Mya (Mya) cf. M.(M.) cuneformis (Bohm) - 4 articulated specimens
Clinocardium hannibali Keen - numerous valves
Cyclocardia sp. - fragments
Macoma sp. - several poorly preserved valves
?Spisula sp. - fragments
Turritella sp. - several fragments
Neptunea sp. - several fragments
77-ADt-90 (Cenozoic loc. M7182) , Chignik , Greenish sandstone and conglomerate about 200-300 feet stratigraphically below 77-ADt-87 (USGS M7181); 7.1 miles N04E of Ivanof Bay Cannery, T. 48 S., R. 65 W., Chignik (A-5) Quadrangle; latitude: 56 deg. 00 min. 11 sec. N; longitude 159 deg. 28 min. 41 sec. W.
Clinocardium hannibali Keen - numerous specimens
Chione sp. - fragments
Mya sp. - fragment
?Thracia sp. - fragment
?Colus sp. - very worn specimen
Neptunea (Neptunea) sp. - 1 fragment
Sand dollar echinoids
77-ADt-181 (Cenozoic loc. M7183) , Chignik , Interbedded pebble conglomerate, grit, volcanic sandstone, shale, siltstone and tuff; sample from upper part of section, but exact position unknown; 5.5 miles N81E of Black Peak, T. 42 S., R. 59 W., Chignik (C-2) Quadrangle; latitude 56 deg. 34 min. 22 sec. N; longitude 159 deg. 37 min. 21 sec. W.
Clinocardium sp. - several poorly preserved specimens
77-ADt-116B (Cenozoic loc. M7184) , Chignik , Greenish volcanic sandstone and conglomerate; 8 miles N22W of Ivanof Bay Cannery, Section 22, T. 48 S., R. 66 W., Chignik (A-5) Quadrangle; latitude 56 deg. 00 min. 42 sec. N; longitude 159 deg. 33 min. 22 sec. W.
Mya (Mya) truncata Linnaeus
Yoldia (Cnesterium) sp. - 1 fragment
Macoma sp. - several fragments
?Papyridea sp.
Clinocardium cf. C. pristinum Keen
Clinocardium sp. - several fragments
Neptunea sp. - 2 fragments
77-ADt-118B (Cenozoic loc. M7185) , Chignik , Conglomeratic sandstone; Section 22, T. 48 S., R. 66 W., Chignik (A-5) Quadrangle; 0.6 miles SE of M7184, above; latitude 56 deg. 00 min. 14 sec. N; longitude 159 deg. 32 min. 49 sec. W.
Indeterminate fragments