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Authors: |
McRoberts, Christopher A.
,
Blodgett, Robert B.
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| Editors: |
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| Date: |
/2002 |
| Title: |
Late Triassic (Norian) mollusks from the Taylor Mountains Quadrangle, southwestern Alaska |
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1662 , , 55-75 , Plates 1-3 |
| Host: |
U.S. Geological Survey Professional Paper: |
| Document Type: |
Article\Abst.\Chapter\report |
| Annotation: |
Bivalve and gastropod affinities suggest an early Norian age, with taxonomic similarities to several southern Alaskan tectonostratigraphic terranes (for example, Alexander and Chulitna), as well as to the South American Cordillera of Peru. The mollusks are associated with numerous brachiopods that also support a Norian age and similar biogeographic affinites. |
| UserNote |
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84RB32
, Taylor Mts
, A conspicuous band of fossiliferous strata from the east end of a conspicuous rubble-crop exposure (approx. 45 m wide) visible from the air, composed of yellow-orange weathering, platy, silty lime mudstone beds that strike N. 45 deg. W. and dip 25 deg. NE. in the SW1/4NE1/4NW1/4 sec. 19, T. 10 N., R. 42 W., Taylor Mountains D-3 1:63,360-scale quadrangle. Collected by R.B. Blodgett in 1984 and 1999, his field nos. 84RB32 and 99RB35, respectively. Fossil fauna composed of numerous mollusks (bivalves, gastropods) and lesser brachiopods. (description from McRoberts and Blodgett, 2002); [Lat. 60.9445, Long. 156.8024 lime mudstone (description from Karl et al., 2011)]
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Tutcheria densestriata Koerner, 1937
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Cassianella cordillerana McRoberts n. sp.
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Gryphaea arcuataeformis Kiparisova, 1936
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Neritaria nuetzeli Blodgett n. sp.
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Minetrigonia cf. M. suttonensis (Clapp & Shimer, 1911)
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Chulitnacula alaskana (Smith, 1927)
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Andangularia wilsoni Blodgett new species
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Coelostylina cf. C. cylindrata Haas
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Cryptaulax aff. C. tilarniocensis Haas
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Genus and species indeterminate 1 (high spired)
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Genus and species indeterminate 2 (low spired)
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Omphaloptycha aff. O. jenksi Haas
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Toxoconcha cf. T. gracilis Haas
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99RB37
, Taylor Mts
, Fossiliferous beds in the central part of a rubble-crop exposure of light-yellow-gray-weathering, platy, silty lime mudstone that strikes N. 85 deg. E. and consists almost entirely of brachiopods and much rarer bivalves. Rubble crop is situated at the northwest end of a low ridge in the SW1/4SW1/4 sec. 20, T. 10 N., R. 42 W., Taylor Mountains D-3 1:63,360-scale quadrangle.; [Lat. 60.9376, Long. 156.7745, lime mudstone (description from Karl et al., 2011)]
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99RB46
, Taylor Mts
, Upper Triassic limestone (distinctive white to light-gray lime packstone containing scleractinian corals, indeterminate hydrozoans, and inozan sponges of Norian age) exposed on east of hill in NE1/4SW1/4NE1/4 Sec. 20, T. 10 N., R. 42 W., Taylor Mountains D-3 1:63,360-scale quadrangle; [Lat. 60.9461, Long. 156.7594, limestone (description from Karl et al., 2011)
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Astraeomorpha crassisepta
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possibly Pamiroseris meriani
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Rhaetiastraea cf. R. vesiculosa
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possibly "Margarosmilia" (M. chalyana?)
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?Distichophyllia cf. D. norica
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