Section H-2 (Helms West Well). Bed 09. Hueco Mountains, west-facing escarpment (Ordovician of the United States)

Where: Hudspeth County, Texas (32.8° N, 106.0° W: paleocoordinates 17.1° S, 77.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Oulodus robustus conodont zone, Aleman Formation (Montoya Group), Maysvillian (450.2 - 449.6 Ma)

• Stratigraphy first described in Howe 1965.

• group of beds-level stratigraphic resolution

Environment/lithology: limestone

• Calcilutite

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Primary reference: H. J. Howe. 1965. Dalmanellidae from the Montoya Group (Ordovician) of Trans-Pecos Texas. Journal of Paleontology 39(2):235-247 [S. Holland/S. Holland/S. Holland]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 165324: authorized by Pete Wagner, entered by Pete Wagner on 17.01.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

• Cobbled from 4 taxonomic papers.
Show authors, comments, and common names
Strophomenata
 Strophomenida - Sowerbyellidae
Eochonetes minerva1, "Thaerodonta magna n. sp." = Eochonetes magna2, "Thaerodonta mucronata n. sp." = Eochonetes mucronata2
Eochonetes minerva1 Bauer and Stigall 2016
"Thaerodonta magna n. sp." = Eochonetes magna2 Howe 1965
"Thaerodonta mucronata n. sp." = Eochonetes mucronata2 Howe 1965
Includes Thaerodonta mucronata scabra
Rhynchonellata
 Orthida - Platyorthidae
Diceromyonia crassa
 Orthida - Dalmanellidae
Onniella plicata
Onniella plicata Howe 1965
 Rhynchonellida - Rhynchotrematidae
Hypsiptycha argenturbicum3, "? Lepidocyclus capax" = Hiscobeccus capax3
"? Lepidocyclus capax" = Hiscobeccus capax3 Conrad 1842
1Bauer and Stigall 2016; 2Howe 1965; 3Howe 1967