Lower Pennsylvanian

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 ?
Monocylic Psaronius from the Lower Pennsylvanian of the Illinois Basin.
The overlying Lower Pennsylvanian rocks consist of quartz sandstones, aluminum-rich clays, and thick coals, which indicate more humid conditions (Phillips and Peppers 1984; Cecil 1990; Miller and Eriksson 1999).
Sedimentary environments of the Lower Pennsylvanian Sharon Conglomerate near Akron, Ohio.
The Lower Pennsylvanian Massillon Sandstone has the longest history of usage; from the early 1800s to the present.
Continental red-bed intervals comprise a significant proportion of the classic Lower Pennsylvanian (Langsettian) section at Joggins, Nova Scotia (Fig.