Pennsylvanian

The Pennsylvanian is, in the ICS geologic timescale, the younger of two subperiods (or upper of two subsystems) of the Carboniferous Period. It lasted from roughly 323.2 ± 1.3 to 298.9 ± 0.8 Ma (million years ago). As with most other geochronologic units, the rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few million years. The Pennsylvanian is named after the American state of Pennsylvania, where rocks with this age are widespread.

The division between Pennsylvanian and Mississippian comes from North American stratigraphy. In North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full fledged geologic period between the Mississippian and the Permian. In Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are grouped together as the Carboniferous Period. The current internationally used geologic timescale of the ICS gives the Mississippian and Pennsylvanian the rank of subperiods, subdivisions of the Carboniferous Period.

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Other articles related to "pennsylvanian":

SS Pennsylvanian - World War II
... At some point after the United States entered World War II, Pennsylvanian was requisitioned by the War Shipping Administration (WSA), but, as with her pre-U.S ... From July to September 1942, Pennsylvanian sailed between New York and Caribbean ports, calling at Trinidad, Key West, Hampton Roads, Guantánamo Bay, and Cristóbal ... In January 1943, Pennsylvanian called at Bandar Abbas, Iran, on the Persian Gulf, but had returned to Caribbean sailings again by March ...
SS Pennsylvanian - Design and Construction
... Point, Maryland, for four new cargo ships—Minnesotan, Dakotan, Montanan, and Pennsylvanian ... The final cost of Pennsylvanian, including financing costs, was $70.35 per deadweight ton, which came out to just under $716,000 ... Pennsylvanian (Maryland Steel yard no ...
Latrobe (Amtrak Station)
... station is near the center of the city, and is currently served only by Amtrak's Pennsylvanian, which operates once per day in each direction ... Limited), an extended version of the Pennsylvanian that terminated in Chicago ... Upon its cancellation, the sole Pennsylvanian marked the first time in Latrobe's railway history that the town was served by just a single, daily passenger ...
Pennsylvanian - Subdivisions
... The Pennsylvanian has been variously subdivided ... The Silesian starts earlier than the Pennsylvanian and is divided in three ages Namurian (corresponding to Serpukhovian and early Bashkirian) Westphalian (corresponding to late ...
SS Pennsylvanian - Interwar Years
... Pennsylvanian resumed cargo service with American-Hawaiian after her return from World War I service ... Hawaiian sugar routes by this time, Pennsylvanian continued inter-coastal service through the Panama Canal in a relatively uneventful career ... One incident of note occurred on 28 November 1930, when Pennsylvanian hit a Southern Pacific ferry near Goat Island (present-day Yerba Buena Island) in a dense fog in San ...