Upper Devonian, Alaska Range (38A M-F7) - Moffit (1954) (Devonian of the United States)

Also known as #38A M-F7

Where: Valdez-Codova County, Alaska (62.8° N, 142.2° W: paleocoordinates 10.5° S, 76.7° W)

• outcrop-level geographic resolution

When: Late/Upper Devonian (382.7 - 358.9 Ma)

• The beds do not constitute a well defined group, but are assigned to middle Devonian on the basis of faunal composition and stratigraphically associated units. Devonian rocks in the Buck Creek area comprise a variety of clastic sedimentary rocks, including shale, quartzite, grit, and others, which are associated with limestone beds. All the beds are folded and tilted. No estimate of thickness is not known, but probably is several thousand feet.

• bed-level stratigraphic resolution

Environment/lithology: marine; coarse-grained, gray, blue limestone

• Beds are folded and locally are schistose, although not distinctly metamorphosed.
• Limestone is massive in structure, coarsely crystalline, and light bluish gray. Most of the group is made up of gray or black slate, hard gray siliceous beds, quartzite, yellowish sandy and gritty beds, chert conglomerate, and brown mica schist.

Size class: macrofossils

Preservation: cast

Collection methods: quarrying,

• Collections submitted to Edwin Kirk for identification.

Primary reference: F.H. Moffit. 1954. Geology of the eastern part of the Alaska Range and adjacent area. United States Geological Survey Professional Paper 989(D) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 40666: authorized by Austin Hendy, entered by Austin Hendy on 26.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of poorly preserved fauna
Rhynchonellata
 Pentamerida - Gypidulidae
Gypidula sp. Hall 1867
 Rhynchonellida - Camarotoechiidae
Camarotoechia sp. Hall and Clarke 1893
Anthozoa
 Favositida - Coenitidae
Coenites sp. Eichwald 1829 tabulate coral
 Stauriida - Phillipsastreidae
"Phillipsastraea sp." = Phillipsastrea
"Phillipsastraea sp." = Phillipsastrea d'Orbigny 1849 horn coral
Stromatoporoidea
 Stromatoporida - Stromatoporidae
Stromatopora sp. Goldfuss 1826