Journal of Paleontology, 90(4), 2016, p. 589–631 Copyright © 2016, The Paleontological Society 0022-3360/16/0088-0906 doi: 10.1017/jpa.2015.69 A Middle Pennsylvanian macrofloral assemblage from wetland deposits in Indiana (Illinois Basin): a taxonomic contribution with biostratigraphic, paleobiogeographic, and paleoecologic implications Arden R. Bashforth,1* William A. DiMichele,1 Cortland F. Eble,2 and W. John Nelson3 1Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA 〈
[email protected]〉; 〈
[email protected]〉 2Kentucky Geological Survey, University of Kentucky, Lexington, KY 40560, USA 〈
[email protected]〉 3Illinois State Geological Survey, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA 〈
[email protected]〉 Abstract.—Taxonomic analysis is provided for a Middle Pennsylvanian macrofloral assemblage collected from clastic wetland deposits in Clay County, Indiana, on the eastern margin of the Illinois Basin. Adpressed plant fossils were recovered from four distinct beds in the lowermost Staunton Formation, positioned above the Minshall Coal (uppermost Brazil Formation), part of a succession deposited near the Atokan-Desmoinesian boundary. The assemblage of 22 fossil-taxa is dominated by pteridosperms (including Neuropteris flexuosa, Macroneuropteris scheuchzeri, Alethopteris densinervosa, Neuropteris ovata, Eusphenopteris neuropteroides, and Neuropteris missouriensis) with lesser cordaitaleans (Cordaites spp. indet.) and sphenopsids (particularly Sphenophyllum cuneifo-