| Sample: |
Sample No. ROC 1113 -- USGS No. Stanford Univ. loc. SU 3652
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| Locality: |
Field No. ROC 1113
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| Description: |
Alaska Peninsula, southwestern Alaska; Karluk C-4 and C-5 1:63,360 quadrangle; east side of Puale Bay about 2,300 feet N. 40° W. of VABM Hike. Coll.: W.T. Rothwell, Jr., 1962, field No. ROC 1113. [Peninsular terrane] (description from Silberling et al., 1997, p. 21); [tanford Univ. loc. SU3652. Alaska Peninsula, southwestern Alaska;
Karluk C-4 and C-5 1:63,360 quadrangle; east side of Puale Bay
about 2,300 ft (700 m) N. 40°W. of VABM Hike. Coll.: W. T.
Rothwell, 1962, field no. ROC 1113. Peninsular terrane. (description from Grant-Mackie and Silberling, 1990, p. 254)] |
| Location: |
Alaska Quadrangle: Karluk C-4 & C-5
Lat.: 57o47'57 " Long.: 155o23'20 " |
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Reference
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| Title: |
The Late Triassic Bivalve Monotis in Accreted Terranes of Alaska
,
1997
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ABSTRACT--Late Triassic bivalves of the genus Monotis occur in at least 16 of the lithotectonic terranes and subterranes that together comprise narly all of Alaska, and they also occur in the Upper Yukon region of Alaska where Triassic strata are regarded as representing non-accretionary North America. On the basis of collections made thus far, 14 kinds of Monotis that differ at the species or subspecies level can be recognized from Alaska. These are grouped into the subgenera Monotis (Monotis), M. (Pacimonotis), M. (Entomonotis), and M. Eomonotis. In places, Monotis shells of one kind or another occur in rock-forming abundance. On the basis of superpositional data from Alaska, as well as from elsewhere in North America and Far Eastern Russia, at least four distinct biostratigraphical levels can be discriminated utilizing Monotis species. Different species of M. (Eomonotis) characterizes two middle Norian leves, both probably within the upper middle Norian Columbianus Ammonite Zone. |
| Report by: |
Norman J. Silberling
,
J. A. Grant-Mackie
,
K. M. Nichols
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| | Age: | Norian (early late Norian) |
| Formation: | Unknown (Unknown (not given)) |
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| Comment: | Plate 2 explanation: Monotis (Monotis) alaskana. 1-6. SU loc. 3652. 1-2 Left valves. 3-6. Right valves. Stanford Univ. loc. SU 3652 "Monotis (M.) alaskana occurs exclusively at a higher level than M. (P.) subcircularis in both the Peninsular and Wrangellia terranes, as illustrated by the examples figured on plates 2 and 3." (Silberling et al., 1997, p. 14) |
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