Midco Locality 3 (ESU Collection) (Permian of the United States)

Also known as Site IIA of Tasch and Zimmerman 1962; Midco Insect Bed

Where: Noble County, Oklahoma (36.5° N, 97.3° W: paleocoordinates 1.8° 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" or "Artinskian"

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, dolomitic, 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.
• "slab"

Size class: macrofossils

Preservation: adpression

Collected by J. Hall, R. J. Beckemeyer in 2003

Collection methods: quarrying,

• "Station 3, Unit 11 of Raasch (1946), Site IIA of Tasch and ZImmerman (1962)" but an entirely new collection; "in a hillside cut on privately owned land that is currently used as a county road materials quarry"

•Johnston Geology Museum, Emporia State University collection

Primary reference: R. J. Beckemeyer. 2004. Raaschiidae (Grylloblattida: Protoperlina), a new insect family from the Lower Permian Wellington Formation of Noble County, Oklahoma. Journal of the Kansas Entomological Society 77(3):215-221 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 104816: authorized by John Alroy, entered by John Alroy on 10.02.2011, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

 Reculida - Sylvaphlebiidae
Phenopterum elongatum Sellards 1909 winged insect
 Grylloblattodea - Lemmatophoridae
Lisca minuta Sellards 1909 ice crawler
 Grylloblattodea - Raaschiidae
Raaschia oklahomensis n. gen. n. sp.
Raaschia oklahomensis n. gen. n. sp. Beckemeyer 2004 ice crawler
 Coleoptera - Tshekardocoleidae
Permocoleus wellingtonensis Lubkin and Engel 2005 beetle
 Miomoptera - Palaeomanteidae
"Delopterum latum" = Delopsocus latus
"Delopterum latum" = Delopsocus latus Sellards 1909 winged insect