Middle Pennsylvanian


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Middle Pennsylvanian

[′mid·əl ‚pen·səl′vā·nyə]
(geology)
The geologic epoch between the Upper and Lower Pennsylvanian.
References in periodicals archive ?
EnerJex's Cherokee Project targets oil at a depth of 650 to 750 feet from Middle Pennsylvanian (Desmoinesian) age sandstone and limestone formations within the Cherokee and Marmaton Groups.
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.
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.
These strata are probably time-equivalent with the uppermost Middle Pennsylvanian strata in the USA (Wagner and Lyons 1997).
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.
The discovery of a Zoophycos-group trace fossil questionably attributed to Echinospira is reported from the Middle Pennsylvanian Sydney Mines Formation of Nova Scotia.
The Middle Pennsylvanian Sydney Mines Formation is a 520 m-thick unit of the Maritimes Basin of Atlantic Canada (Gibling et al.
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.