USGS DR 2542, De Long Mountains [Ikalukrok unit, Kuna Fm] (Carboniferous of the United States)

Also known as 98AD7A; Loc. 65

Where: Alaska (68.2° N, 162.9° W: paleocoordinates 32.9° N, 11.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ikalukrok Member (Kuna Formation), Serpukhovian (330.9 - 323.2 Ma)

• STRATIGRAPHIC RELATIONS: From the Kuna Formation. AGE: early Late Mississippian (Meramecian to lower part of the Chesterian). Faunal group 1B of Holdsworth and Murchey (1988) and Assemblage Zone 4 (Scharfenbergia impella gp – Albaillella sp. aff. A. cartalla assemblage ) of Murchey (1990); placed here in the Serpukhovian to avoid stratigraphic orhaning. STRATIGRAPHIC POSITION: Ikalukrok unit of Kuna Formation; Suds prospect.

• bed-level stratigraphic resolution

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

• SPECIFIC LITHOLOGY: Dark gray to black chert; hillside rubble crop. Thin section shows abundant radiolarians that appear well preserved (sharp rims) in a muddy, cherty matrix. LITHIFICATION: Lithified, on the basis of facies description and preparation techniques.

Size class: macrofossils

Collected by Dumoulin in 1998; 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 91032: authorized by Austin Hendy, entered by Austin Hendy on 31.08.2009

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.
Protozoa
 Entactinaria - Pylentonemidae
Pylentonema cf. antiqua Deflandre 1963 radiolarian
 Entactinaria - Tetrentactiniidae
Triaenosphaera hebes Won 1983 radiolarian
 Albaillellaria - Albaillellidae
Albaillella sp. Deflandre 1952 radiolarian
Albaillella aff. cartalla Ormiston and Lane 1976 radiolarian
 Latentifistularia - Ruzhencevispongidae
"Scharfenbergia impella" = Wonia
"Scharfenbergia impella" = Wonia radiolarian