Midco Locality 16 (MCZ Collection) (Permian of the United States)

Where: Noble County, Oklahoma (36.3° N, 97.3° W: paleocoordinates 1.7° N, 27.0° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Midco Member (Wellington Formation), Artinskian (290.1 - 279.3 Ma)

• "Lower Permian... Leonardian... Artinskian" (Beckemeyer 2004)

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, massive, dolomitic, gray, argillaceous limestone

• Salty playa lake. The lower layer shows sedimentational and organic features which suggest that it was laid down close to the shore and that most of its biota was washed into the lake. The matrix and biota of the middle layer, which is highly irregular and characterized by pink partings, were probably transported to the water by violent dust storms. The upper layer is highly argillaceous, and was deposited under strongly saline conditions; insects are rare but they are very well preserved.
• "Argillaceous, dolomitic limestone, in solid, massive, heavy layer, dark gray, homogeneous, non-laminated, very fine-grained, locally with one or two laminae of coarser, more porous material, the horizontal surfaces of which are mottled hematite red and light brownish gray" (Beckemeyer 2004: repeated from Raasch 1946)

Size class: mesofossils

Preservation: adpression

Reposited in the MCZ

Collection methods: quarrying

Primary reference: F. M. Carpenter. 1947. Lower Permian Insects from Oklahoma. Part 1. Introduction and the Orders Megasecoptera, Protodonata, and Odonata. Proceedings of the American Academy of Arts and Sciences 76:25-54 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 104890: authorized by John Alroy, entered by John Alroy on 11.02.2011, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Diaphanopterodea - Martynoviidae
Martynovia longipennis n. sp. Carpenter 1947 winged insect
 Dicondylia - Progoneuridae
Progoneura nobilis n. sp. Carpenter 1947 winged insect
Progoneura venula n. sp. Carpenter 1947 winged insect
 Dicondylia - Kennedyidae
Kennedya fraseri Carpenter 1947 winged insect