All plates were recovered from the Middle Pennsylvanian
Putnam Hill Limestone of the Allegheny Group from an abandoned strip mine north and east of a tributary of Elk Fork, about 3.4 km northwest of McArthur, Vinton County, southeastern Ohio (lat 39[degrees]16'35"N, long 82[degrees]29'40"W).
A new Middle Pennsylvanian
(Westphalian) amphibian trackway from the Cross Mountain Formation, east Tennessee Cumberlands.
This fossil wing was initially placed in the Mecoptera by Tillyard (1926), and subsequently assigned to the poorly known order Miomoptera by Carpenter (1965), which has an occurrence ranging from the Middle Pennsylvanian
to the Late Permian.
Donaldina robusta (Heterobranchia: Streptacididae) from the Middle Pennsylvanian
, La Joya Formation, Sonora, Mexico.
Depositional Model: The Absaroka transgressive event began in the North American craton near the beginning of the Middle Pennsylvanian
time, and deposited repetitive alternating nonmarine and marine sediments in the Midcontinent (Heckel, 1977, 1980; Levin, 1991).
Part of a large chondrichthyan fin spine from Middle Pennsylvanian
deposits of Illinois was described and named Xystracanthus mirabilis by St.
Lycopsida from the lower Westphalian (Middle Pennsylvanian
) of the Maritime Provinces, Canada.
(Allegheny Group) Polyplacophora from Ohio.
A Middle Pennsylvanian
captorhinomorph, and the interrelationships of primitive reptiles.
Recent studies suggest that, during Early to early Middle Pennsylvanian
, paleoclimate fluctuated from ever-wet conditions during sea level low stands, to wet but seasonally dry conditions during high stands (Cecil and Dulong 1998).
Here I describe an upright tree of Macroneuropteris scheuchzeri rooted above the Point Aconi Coal in the Middle Pennsylvanian
Sydney Mines Formation of Nova Scotia--the first example of an autochthonous pteridosperm described in the literature.
Lower Freeport Sandstone came from the hills around Lisbon, East Liverpool, and Uhrichsville; Lower Mahoning and Buffalo sandstones were extensively quarried at Corning, Steubenville, and Tippecanoe.