Arnett (Carboniferous of the United States)

Where: Washington County, Arkansas (35.9° N, 94.0° W: paleocoordinates 8.8° S, 31.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Brentwood Member (Bloyd Formation), Morrowan (323.2 - 318.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

• shale immediately above the highest limestone ledge of the Brentwood member

Size class: macrofossils

Primary reference: J. K. Rigby and W. L. Manger. 1994. Morrowan lithistid demosponges and hexactinellids from the Ozark Mountains of northwestern Arkansas. Journal of Paleontology 68(4):734-746 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 111781: authorized by Wolfgang Kiessling, entered by Uta Merkel on 28.06.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Blastoidea
 Pentremitida - Pentremitidae
Pentremites sp. Say 1820 blastoid
Strophomenata
 Productida - Linoproductidae
 Productida - Productellidae
"Tesuquea sp." = Brachiotesuquea
"Tesuquea sp." = Brachiotesuquea Ceccolini and Cianferoni 2023
Rhynchonellata
 Spiriferida - Spiriferidae
Hexactinellida
 Lyssacinosa - Stiodermatidae
Stioderma hadra n. sp. Rigby and Manger 1994 glass sponge
Demospongiae
 Spirosclerophorida - Haplistiidae
Haplistion sphaericum Finks 1960 demosponge
 Lithistida - Anthaspidellidae
Virgaspongia ichnata n. gen. n. sp.
Virgaspongia ichnata n. gen. n. sp. Rigby and Manger 1994 demosponge