USGS DR 2521, De Long Mountains [Siksikpuk Fm] (Carboniferous of the United States)

Also known as 00AD20A; Loc. 72

Where: Alaska (68.1° N, 162.8° W: paleocoordinates 32.9° N, 11.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Siksikpuk Formation (Etivluk Group), Serpukhovian (330.9 - 323.2 Ma)

• STRATIGRAPHIC RELATIONS: From the Siksikpuk Formation of the Etivluk Gp. AGE: Probably late Late

•Mississippian to early Middle Pennsylvanian (probably Chesterian-Morrowan); placed here in the Serpukhovian to avoid stratigraphic orhaning. STRATIGRAPHIC POSITION: Siksikpuk Formation (base of lower subunit) 0.5 m above Kuna Formation, on southeast side of “Orange Creek.” Contact marked by horizon of mammiform structures with 40 cm of vertical relief.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, green chert

• SPECIFIC LITHOLOGY: Sample from 10 cm thick bed of moderate orange weathering, dark gray (locally slightly olive green) chert. Thin section shows scattered radiolarians, most filled with chalcedony, in cryptocrystalline chert matrix; test margins generally sharp and rim structure locally well preserved. LITHIFICATION: Lithified, on the basis of facies description and preparation techniques.

Size class: macrofossils

Collected by Dumoulin in 2000; reposited in the USNM

• COLLECTOR: J. A. Dumoulin. REPOSITORY: Presumably USNM.

Primary reference: J. A. Dumoulin, A. G. Harris, C. D. Blome and L. E. Young. 2006. Conodont and radiolarian data from the De Long Mountains Quadrangle and adjacent areas, northern Alaska. United States Geological Survey Open-File Report 2006(106):1-174 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 91036: authorized by Austin Hendy, entered by Austin Hendy on 01.09.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for radiolarians, possibly including conodonts and other macrofossils. NOMENCLATURE: Identified by C. D. Blome; not an authoritative publication, but with modern nomenclature and species-resolution identifications.
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Protozoa
 Entactinaria - Entactiniidae
"Belowea variabilis" = Entactinosphaera
"Belowea variabilis" = Entactinosphaera radiolarian
 Latentifistularia - Ruzhencevispongidae
"Scharfenbergia ruestae" = Wonia, "Scharfenbergia sp." = Wonia
"Scharfenbergia ruestae" = Wonia radiolarian
"Scharfenbergia sp." = Wonia Ozdikmen 2009 radiolarian