Middle Pennsylvanian


Also found in: Wikipedia.

Middle Pennsylvanian

[′mid·əl ‚pen·səl′vā·nyə]
(geology)
The geologic epoch between the Upper and Lower Pennsylvanian.
References in periodicals archive ?
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.
Abdominal legs of Middle Pennsylvanian Srokalarva: Early expression of the Distal-less gene in holometabolous insects.
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.
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.
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).
The discovery of a Zoophycos-group trace fossil questionably attributed to Echinospira is reported from the Middle Pennsylvanian Sydney Mines Formation of Nova Scotia.
Middle Pennsylvanian 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.
nov: a medullosan ovule from the Middle Pennsylvanian Mazon Creek flora of northeastern Illinois, U.
The family Saurerpetontidae, to which these genera belong, ranges from middle Pennsylvanian (Westphalian D) to Lower Permian.