Cooks Range, where Montoya crosses north-south ridge, Second Value Fm. (Ordovician of the United States)

Where: Luna County, New Mexico (32.6° N, 107.7° W: paleocoordinates 15.6° S, 80.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Second Value Formation, Edenian (451.0 - 450.2 Ma)

• "sandy limestone marking the transition from the Cable Canyon sandstone into the Upham "dolomite"(here a good limestone)", in Flower (1957)

Environment/lithology: marine; sandstone and limestone

• "The Second value Fm. here consists of 3 ft. coarse dolomitic limestone replete with large, more dolomitic worm borings; 35 ft. of brown-weathering Cable Canyon sandstone; the 1 to 2 ft. of sandy limestone; then 40 ft. of pure limestone, the base and top fine grained, the middle coarse and granular, capped by a 10 ft. interval of conspicuous white saccharoidal crystalline limestone.", in Flower (1957)

Size classes: macrofossils, mesofossils

Primary reference: R. H. Flower. 1957. The Ordovician Development of the Actinoceratida, with notes on Actinoceroid Morphology and Ordovician Stratigraphy. State Bureau of Mines and Mineral Resources New Mexico Institute of Mining and Technology, Memoir 2:1-59 [B. Kröger/B. Kröger/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 172569: authorized by Björn Kröger, entered by Björn Kröger on 11.08.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Actinocerida - Gonioceratidae
Lambeoceras armstrongi