ammonites
NMMNH L-3433; Carrizo Arroyo ( of the United States)

Where: New Mexico (34.8° N, 106.9° W: paleocoordinates 0.4° S, 37.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Red Tanks Member (Bursum Formation), Virgilian (303.4 - 295.0 Ma)

• "In Carrizo Arroyo, a 100-m thick section through the Red Tanks Member of the Bursum Formation (late Virgilian)." Schneider et al., 2004

Environment/lithology: pond; lithified, gray, green mudstone

• "Each DS consists mostly of red and purple, nonmarine mudstones and siltstones of a coastal plain environment and of greenish-gray, locally fossiliferous mudstones of a brackish to freshwater environment." Schneider et al., 2004
• "Both localities are in greenish-gray mudstone. This mudstone lithofacies appears massive, but locally a poorly developed fissility can be recognized. The mineralogic composition is similar to that of the purple and red mudstones/siltstones; these strata contain chlorite, illite, kaolinite, montmorillonite, rare other clay minerals, quartz, calcite and albite in varying amounts." Schneider et al., 2004

Size classes: macrofossils, mesofossils

Preservation: mold/impression, adpression

Reposited in the NMMNH

Primary reference: A. P. Rasnitsyn, D. S. Aristov, A. V. Gorochov, J. M. Rowland, and N. D. Sinitshenkova. 2004. Important new insect fossils from Carrizo Arroyo and the Permo-Carboniferous faunal boundary. In S. G. Lucas, K. E. Zeigler (eds.), Carboniferous-Permian transition, New Mexico Museum of Natural History and Science Bulletin 25:215-246 [M. Clapham/J. Karr] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 124386: authorized by Matthew Clapham, entered by Jered Karr on 14.02.2012

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)