USGS 4361-CO - Jones Ridge Limestone, Jones Ridge-Squaw Mountain area (Cambrian of the United States)

Also known as 63ABa3332

Where: Alaska (65.1° N, 141.0° W: paleocoordinates 7.8° N, 60.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lower Member (Jones Ridge Limestone Formation), Dresbachian (497.0 - 485.4 Ma)

• STRATIGRAPHIC RELATIONS: From Jones Ridge Limestone (Early-Late Cambrian), which regionally underlies an unamed unit of Early Ordovician age and is approximately correlative to the Hillard Limestone. AGE: Dresbachian on occurence of faunal assemblages similar to that of the Dunderbergia zone of the Great Basin. STRATIGRAPHIC POSITION: About 600 ft below top of Lower Member of Jones Ridge Limestone.

• bed-level stratigraphic resolution

Environment/lithology: lithified, fine-grained limestone

• ENVIRONMENT: Carbonate deposition, intermittent turbulent conditions.
• SPECIFIC LITHOLOGY: Fine grained limestone. LITHIFICATION: Lithified, based on age and facies.

Size class: macrofossils

Reposited in the USNM

• COLLECTOR: A.R. Palmer and E.E. Brabb (1963). REPOSITORY: USGS and USNM.

Primary reference: A.R. Palmer. 1968. Cambrian trilobites of East-Central Alaska. United States Geological Survey Professional Paper 559(B) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 64801: authorized by Austin Hendy, entered by Austin Hendy on 15.09.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Only trilobites (following monograph focus). No other taxa listed. IDENTIFIER: A.R. Allison. NOMENCLATURE: Authoritative publication, though probably somewhat age nomeclature, with species designations.
Show authors, comments, and common names
Trilobita
 Corynexochida - Cheilocephalidae
Cheilocephalus expansus n. sp.
Cheilocephalus expansus n. sp. trilobite
 Ptychopariida - Elviniidae
Dunderbergia seducta n. sp.
Dunderbergia seducta n. sp. trilobite
 Ptychopariida - Norwoodiidae
Hardyoides aspinosa n. sp.
Hardyoides aspinosa n. sp. trilobite