Lower Pennsylvanian

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Lower Pennsylvanian

[′lō·ər ‚pen·səl′vā·nyən]
(geology)
The earliest epoch of the Pennsylvanian period of geologic time, beginning about 310,000,000 years ago.
References in periodicals archive ?
Metropator pusillus Handlirsch 1906 is of Early Pennsylvanian age (Namurian Stage) and originates from the Altamont Coal Mine of the Lower Pottsville Group in central Pennsylvania.
Permo-Carboniferous climate: Early Pennsylvanian to Late Permian climate development of central Europe in a regional and global context, pp.
2D-F) Westphalomerope Mecopteroidea Early Pennsylvanian, maryvonneae Nel, Bashkirian Stage Roques, Nel, Prokop ("Veine Maroc, and Steyer 2007 Vicoigne Series") (Fig.
Tree-fern trunks are among the rarest plant fossils in the Early Pennsylvanian Joggins Formation, with only three specimens recorded, all of which are assigned to Artisophyton.
Tree ferns evolved in latest Mississippian times and remained rare during the Early Pennsylvanian (DiMichele and Phillips 2002).
DiMichele and Phillips (1977) described the monocyclic Psaronius simplicicaulis from an Early Pennsylvanian bedrock valley-fill succession in Illinois (Leary 1981), where it was associated with an upland/dryland assemblage of cordaitaleans, pteridosperms, and noeggerathialians (Leary 1975, 1993).
In this region, Late Mississippian to Early Pennsylvanian glacio-eustatic baselevel fall resulted in subaerial erosion of the underlying marine shales and formation of paleovalleys.
The Early Pennsylvanian Sharon Formation of northeastern Ohio illustrates a complex response to Carboniferous glacio-eustasy and foreland basin subsidence, during an interval of progressive climate change.
Sediments of the Early Pennsylvanian Pottsville Group (including the Sharon Formation) were shed into the Appalachian foreland basin from the advancing thrust sheets to the east, and also from a landmass in Ontario and Quebec (for example, Meckel 1967; Krissek and others 1986).
The area of greatest thickness in eastern Illinois may be the result of the development of an early Pennsylvanian depocenter in the central part of the Fairfield Basin.
Early Pennsylvanian stratigraphy and the influence of sub-Pennsylvanian topography in the subsurface of Indiana.
Maps currently under construction will show the interval-by-interval depositional limits that document the onlap that occurred during early Pennsylvanian transgression in the Illinois Basin.

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