A late Middle Pennsylvanian flora of the Narragansett basin, Massachusetts

摘要

Forty species of Pennsylvanian plant megafossils have been recovered from a new plant-bearing horizon in the middle part of the Rhode Island Group of the Narragansett basin. Annularia sphenophylloides, Pecopteris arborescens, Asterophyllites equisetiformis, Pecopteris lamuriana, Mariopertis nervosa, Sphenopteris minutisecta, and Cordaites principalis, in order of abundance, constitute 77% of the flora. The fossil assemblage is of late Alleghenian to early Conemaughian age and indicates that the overlying beds are probably of Late Pennsylvanian age.