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GSA Bulletin; March 1978; v. 89; no. 3; p. 433-438; DOI: 10.1130/0016-7606(1978)89<433:ALMPFO>2.0.CO;2
© 1978 Geological Society of America
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A late Middle Pennsylvanian flora of the Narragansett basin, Massachusetts

PAUL C. LYONS*,1 and WILLIAM C. DARRAH2

1 Weston Observatory, Boston College, Weston, Massachusetts 02193
2 Spruce Hill, R.D. 1, Gettysburg, Pennsylvania 17325

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.






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