Mud Springs Mountain (Mud Springs Mt. Fm.) (Ordovician of the United States)

Also known as near Hot Springs

Where: Sierra County, New Mexico (33.2° N, 107.3° W: paleocoordinates 12.5° S, 90.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Mud Springs Mountain Formation (El Paso Group), Demingian (485.4 - 478.6 Ma)

• "From beds just above the oolite of the El Paso limestone, Demingian [...] " (Flower, 1964 p. 109); "The Bridgites [= Orospira] reef above the oolite is named the Mud Springs Mountain formation [...] " (ibid. p. 148); In fig. 50 the rocks above the oolite in the Cook(e)s Range section correspond to interval B1 of Cloud & Barnes (1946, Univ. Texas Publ. 4621).

•Flower (1970): uppermost Demingian, Zone F

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; stromatolitic reef rocks

• "Thew reef is mainly algal, with a good admixture of sponges" (p. 147)

Size class: macrofossils

Preservation: cast, recrystallized, replaced with calcite

Reposited in the USNM

• RHF = collection of Rousseau H. Flower, transferred to the Smithsonian Institution/U.S. National Museum (see Wolberg, 1990, J. Paleont. 64(3, 5, 6))

Primary reference: R. H. Flower. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). State Bureau of Mines and Mineral Resources New Mexico Institute of Mining and Technology, Memoir 12:234 p. [B. Kröger/T. Liebrecht/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88945: authorized by Björn Kröger, entered by Torsten Liebrecht on 26.04.2009, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Euomphalina - Raphistomatidae
Bridgeites discoideus Flower 1968 snail
Cephalopoda
 Orthocerida - Baltoceratidae
Metabaltoceras minutum n. sp. Flower 1964
RHF 318 (type)
 Orthoceratoidea - Protocycloceratidae
Endocycloceras gracile n. sp. Flower 1964
NMBM 653 (type)