| Sample: |
Sample No. 68ACn1751 -- USGS No. 7093-CO
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| Locality: |
Field No. 68ACn1751
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| Description: |
Lat. 65o 37'20" N., Long. 147o 21'12" W., Livengood C- 1, White Mtns. [Oliver et al., 1975, p. 34 provide following description: 65o 37'20", 147o 21'12" (probably same locality as as 09AP87)] |
| Location: |
Alaska Quadrangle: Livengood C-1
Lat.: 65o37'20 " Long.: 147o21'12 " |
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Reference
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| Title: |
Report on Referred Fossils
,
1972
(05/05)
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This is a hurried report but based on rather thorough examination of the collections recently sent. Most of this will be incorporated into the Alaska Prof. Paper and should not be quoted from this report. |
| Report by: |
William A. Oliver
, Jr.
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| Referred by: |
Robert M. Chapman
,
Michael Churkin
, Jr.
,
Florence R. Weber
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| | Age: | Late Ordovician |
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| Comment: | Upper Ordovician This could be Lower Silurian, but Norford has just described something very close to species #1, with Sarcinula, in association with unquestionable Upper Ordovician forms and this age now seems almost certain. |
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| Title: |
Ordovician, Silurian, and Devonian corals of Alaska
,
1975
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Abstract Corals are common in Ordovician, Silurian, and Devonian rocks from Alaska, but few have been described or illustrated. Most of the known occurrences of corals are in carbonate rocks, either in an east-west belt of shelf facies across central Alaska that presisted from pre-Ordovician to Middle Devonian time or in a more southerly volcanic graywacke belt of geosynclinal facies that includes significant limestone units in southeastern Alaska. Corals occur in other areas but are less well known.
Annotated lists of corals summarize most collections made by U.S. Geological Survey geologists in the last 15 years. Many of the corals are illustrated. |
| Report by: |
William A. Oliver
, Jr.
,
C. W. Merriam
,
Michael Churkin
, Jr.
|
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| | Age: | Late Ordovician |
| Formation: | Fossil Creek Volcanics |
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| Comment: | In the White Mountains north of Fairbanks (fig. 7, area 3), the 2,500-foot Tolovana Limestone (see Silurian and Devonian discussions below) is above the Fossil Creek Volcanics, reportedly of Ordovician age (see fig. 10). The massive limestone and dolomite of the Tolovana is directly underlain by several feet of poorly exposed tuffaceous carbonate rocks containing tabulatomorph corals in growth position (Michael Churkin, Jr., R.M. Chapman, and F.R. Weber, field observations, 1968). The tuff grades downward into a thick conglomerate made of volcanic and plutonic rocks boulders which in turn lies on a section, thousands of feet thick, of siliceous clasitc rocks and pillow laves, the Fossil Creek Volcanics proper (Chapman, Weber, and Taber, 1971).
Two collections from the tuffaceous limestone contain the following corals .... Norford (1971) described C. ellesmerensis and listed associated corals that are collectively of undoubtedly Late Ordovician age. The collections from the tuffaceous limestone are of this age also as indicated by the presence of Calapoecia. (from Oliver et al., 1975, p. 24) |
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