Middle Devonian, Alaska Range (Lot No. 4) - Moffit (1954) (Devonian of the United States)

Also known as Lot No. 4 - Capps (1916)

Where: Valdez-Codrova County County, Alaska (61.5° N, 142.9° W: paleocoordinates 61.5° N, 142.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Middle Devonian (393.3 - 382.7 Ma)

• Specifically: "from agglomerate series; shale beds associated with lava flows and pyroclastic beds". 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; shale

• Beds are folded and locally are schistose, although not distinctly metamorphosed.
• Specifically: "from agglomerate series; shale beds associated with lava flows and pyroclastic beds". 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

Collection methods: quarrying,

• Collections reidentified by Edwin Kirk.

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 40668: authorized by Austin Hendy, entered by Austin Hendy on 26.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Probably representative of depleted fauna
 Pentamerida - Clorindidae
 Orthida - Dalmanellidae
Dalmanella sp. Hall and Clarke 1892