USGS DR 2545-2586, De Long Mountains [Siksikpuk Fm] (Permian of the United States)

Also known as 98JS7A; Loc. 61

Where: Alaska (68.2° N, 163.2° W: paleocoordinates 48.1° N, 2.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Siksikpuk Formation (Etivluk Group), Leonard (290.1 - 268.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Siksikpuk Formation of the Etivluk Gp. AGE: late Early-middle Middle Permian (middle Leonardian-middle Guadalupian). Fauna assignable to Pseudoalbaillella globosa Zone of Ishiga (1986). STRATIGRAPHIC POSITION: Sample from middle(?) subunit of Siksikpuk Formation (Etivluk Group) overlying Kogruk Formation. Conodont sample 98JS7K, taken from top of Kogruk slightly to southeast (loc. 62, table 6), contained late Meramecian-Chesterian conodonts.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, green, cherty/siliceous shale

• SPECIFIC LITHOLOGY: Maroon and light-greenish-gray shale and lesser chert. Thin section consists of abundant radiolarians in a red muddy matrix. LITHIFICATION: Lithified, on the basis of facies description and preparation techniques.

Size class: macrofossils

Collected by Kelley in 1998; reposited in the USNM

• COLLECTOR: J. S. Kelley. 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 91031: 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.
 Albaillellaria - Follicucullidae
Follicucullus aff. monacanthus Ishiga and Imoto 1982 radiolarian
Pseudoalbaillella aff. longicornis Ishiga and Imoto 1980 radiolarian
 Entactinaria - Entactiniidae
Entactinia modesta Sashida and Tonishi 1985 radiolarian
"Entactinia itsukaichiensis" = Stigmosphaerostylus itsukaichiensis Sashida and Tonishi 1985 radiolarian
 Latentifistularia - Ormistonellidae
"Nazarovella sp." = Quadricaulis
"Nazarovella sp." = Quadricaulis Caridroit and De Wever 1986 radiolarian
 Latentifistularia - Latentifistulidae
Latentifistula sp. Nazarov and Ormiston 1983 radiolarian