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

• "from the first piloceroid zone of the El Paso group" (Flower, 1964 p. 93); "The first piloceroid zone is given the name Victorio formation [...] " (ibid. p. 148); In fig. 50 the 1st piloceroid zone of the Cook(e)s Range section corresponds to interval A of Cloud & Barnes (1946, Univ. Texas Publ. 4621) and to the upper part of the Gorman Fm. (= Hag Hills Fm. in Goldhammer et al., 1993, J. Sed. Petr. 63(3)) of the southern Franklin Mts., El Paso Co., TX., and is referred to the middle Canadian.

Environment/lithology: shallow subtidal; shelly/skeletal lime mudstone

• "hard calicilutite layers with abundant small shells"

Size class: macrofossils

Preservation: cast

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 88830: authorized by Björn Kröger, entered by Torsten Liebrecht on 22.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• The type material of Rioceras nondescriptum consists of 6 syntypes. Since the one with the lowest catalogue number (856) has been found at Mud Springs Mountain (Flower, 1964 p. 103), it is arbitrarily decided by the enterer that this is the type locality. The remainder of the type series is from Cooks Range, Luna Co., New Mexico (PBDB coll. no. 88827).
Cephalopoda
 Ellesmerocerida - Rioceratidae
Rioceras nondescriptum n. gen. n. sp.
Rioceras nondescriptum n. gen. n. sp. Flower 1964
RHF 856 (syntype, see comments on taxonomic list)