|
Reference
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| Title: |
Report on Referred Fossils
,
1974
(02/26)
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The following have been identified from the collections submitted with covering memo dated Dec. 20, 1973. Collectively, this is almost the same assemblage as USGS 7981-SD with which you related it on field evidence. The one addition is a single rugose coral that is probably Temnophyllum sp. The genus Temnophyllum ranges from Eifelian (rare) through Givetian and Frasnian. In my Professional Paper evaluation of the Jade Mts. Limestone-dolomite unit corals, I concluded that they were of Early or Middle Devonian age with Middle being more likely. This new Temnophyllum? supports a Middle Devonian age for the whole coral assemblage but if age differences between collections are allowed, some could be Early and others Late Devonian. Collection 73ATr84.1 contains no recognizable corals. Three tubular or branching specimens are completely recrystallized. They could be thamnoporoid corals, bryozoans, stromatoporoids or inorganic in origin. Possible brachiopods in 82.2 and 84.1 will be shown to Tom before being discarded. |
| Report by: |
William A. Oliver
, Jr.
|
| Referred by: |
Irv L. Tailleur
|
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|
| | Age: | Middle Devonian |
| Formation: | Baird Group |
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| Occurrence(s) |
| No. |
Group |
|
Name |
Qty |
Notes |
| 1 |
Rugose Corals |
|
Thamnoporoid corals |
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| 2 |
Rugose Corals |
|
Temnophyllum? sp. |
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| 3 |
Vertebrates |
|
fish bone (to D. Dunkle) |
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|
|
| Title: |
Report on Referred Fossils
,
1974
(03/12)
|
|
|
| Report by: |
David H. Dunkle
|
| Referred by: |
Irv L. Tailleur
|
|
|
|
| | Age: | Middle Devonian-Late Devonian |
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| Comment: | The “bone” is a crushing tooth plate of a ptyctodontid fish. The linear transverse alignment of medullary tubules of dentine at an oblique angle to the biting surface points to the well-known and widely distributed genus Ptyctodus (=P. obliquus in the eastern hemisphere and P. calceolus in North America). The genus is generally encountered in marine limestone and calcareous shales of Middle and Upper Devonian age (most common distribution, Eifelian to Frasnian with perhaps the most notable exceptions being occurrences in the Louisiana ls. and conglomeratic base of the Bushberg in Missouri). This is the only Alaskan discovery I know of and is being preserved in the U. S. National Museum collection. |
| Occurrence(s) |
| No. |
Group |
|
Name |
Qty |
Notes |
| 1 |
Vertebrates |
|
Ptyctodus sp. |
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