Reference Detail of

Report on Referred Fossils
Edit Reference Add/Edit Sample Sample List Show Map

Stratigraphic range: Middle Devonian
Kinds of fossils: Corals
Quadrangle or area: Ambler River Quad., Alaska
Shipment No.: A-74-1
Referred by: Tailleur, Irv L.
Report prepared by: Oliver, William A., Jr.
Date: 02/26/1974

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.


***
Brief statement of problem and remarks (from collector):
Hopefully add to 66APa97 (7981 SD) for more definitive age assignment.

User Note module to be added
73ATr82.2 (9276-SD) , Ambler River , Lat. 67 degrees 14 min. 30 sec. N., 158 degrees 05 min. 25 sec. W.; sec. 1, T. 21 N., R. 3 E.; knoll at foot of igneous/phyllite scarp on low arete. N. side west central Jade Mountain; from rubble on top.
Amphipora?? sp. (very questionable)
Cladopora sp.
Syringopora? sp. (not same sp. as below [73ATr82.3])
73ATr82.3 (9277-SD) , Ambler River , Same locality as 73ATr82.2, but from dark-colored bed in 100 ft. section at foot of north edge.
Alveolites sp.
Favosites? sp.
Syringopora sp.
Indet. rugose coral fragment
73ATr85 (9278-SD) , Ambler River , Lat. 67 degrees 15 min. 06 sec. N.; long. 158 degrees 06 min. 20 sec. W. sec. 1, T. 21 N., R. 3 E.; lower part of more or less continuously exposed section at north end of T82 ridge; 1700-1750 ft. alt., 600-700 stratigraphically below top.
Thamnoporoid corals
Temnophyllum? sp.
fish bone (to D. Dunkle)