Where: Socorro County County, New Mexico (33.9° N, 106.3° W: paleocoordinates 2.0° S, 38.4° W)

• coordinate estimated from map

When: Burrego Formation, Missourian (306.0 - 303.7 Ma)

• This is the general location of Thompson's (1942) type section of his Keller Group, and includes underlying strata down to his Council Springs Limestone.... In the following discussion of the Late Pennsylvanian paleontology of Bruton Canyon, fossil occurrences are related to the stratigraphic units reported by Thompson (1942; Fig. 3).

Environment/lithology: lithified, gray limestone

Size classes: macrofossils, mesofossils, microfossils

• Bed 7 is indeed rich in brachiopods; the assemblage is dominated by specimens of the large productide Echinaria semipunctata, with smaller numbers of other productides (Antiquatonia, Linoproductus), Composita subtilita, and Neospirifer alatus (Table 1). Isolated fusulinids and fragments of fenestrate bryozoans and crinoids are the only other invertebrates observed in this assemblage. The high concentration of Echinaria in this assemblage is unusual in the Pennsylvanian of New Mexico, but the specific ecological conditions responsible for this concentration are unclear. Specimens of Echinaria occur in many Late Pennsylvanian marine assemblages, but typically only a few isolated individuals are present in a given assemblage. The brachiopods in this Burrego unit tend to have exfoliated shells and are strongly weathered when found loose on the outcrop.

Preservation: cast

Collection methods: Fossil collections were made from six intervals in Thompson's Missourian-Virgilian section here. Localities and figured specimens in this paper bear New Mexico Museum of Natural History and Science (NMMNH) numbers.

•

•specimens from the middle part of the Burrego Member

Primary reference: B.S. Kues. 2009. Late Pennsylvanian invertebrate paleontology of Bruton Canyon, northern Sierra Oscura, Socorro County, New Mexico. In V. Lueth, S.G. Lucas, R.M. Chamberlain (eds.), Geology of the Chupadera Mesa 249-266 [B. Seuss/B. Seuss]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 215693: authorized by Barbara Seuss, entered by Barbara Seuss on 19.11.2020

Creative Commons license: CC BY (attribution)