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Name Elevation Location Last eruption meters feet Coordinates; Malumalu: Last 8,000 years Ta‘u-931: 3054: 30,000 years ago [15]: Ofu-Olosega: 639: 2096: 1866 unnamed submarine cone eruption
In Pennsylvania, the valley is known by three names: (listed from north to south) the Lehigh Valley, the Lebanon Valley, and the Cumberland Valley. Rocks that characterize this region include: limestone, dolomite, slate , shale, sandstone, siltstone, and some scattered basalt.
Mole Hill is a rounded hill composed of basalt, a volcanic rock, formed during the Eocene epoch of the Paleogene period. It is the eroded remnant of what was an active volcano approximately 47 million years ago, making it one of the youngest volcanoes on the east coast of North America. It is located west of Harrisonburg, Virginia, in ...
The Ramapo Fault forms the boundary between the Newark Basin and the Highlands, running from Haverstraw, New York to near Schaefferstown, Pennsylvania. The Newark Basin, an aborted rift valley created during the breakup of Pangaea, consists of sedimentary and volcanic rocks from the Triassic and early Jurassic. Smaller extensions of the Ramapo ...
The "Pennsylvania Salient" in the Appalachians appears to have been formed by a large, dense block of mafic volcanic rocks that became a barrier and forced the mountains to push up around it. 2012 image from NASA's Aqua satellite. Generalized east-to-west cross section through the central Hudson Valley region. USGS image.
Elsewhere, the active volcano of Kilauea in Hawaii had been erupting almost constantly from its eastern rift zone since 1983. Then in April 2018, its 35-year-long eruption ended.
South Mountain is the northern extension of the Blue Ridge Mountain range into Maryland and Pennsylvania.From the Potomac River near Knoxville, Maryland in the south to Dillsburg, Pennsylvania in York County, Pennsylvania in the north, the 70-mile-long (110 km) range separates the Hagerstown and Cumberland valleys from the Piedmont regions of the two states.
The Pocono Mountains, commonly referred to as the Poconos (/ ˈ p oʊ k ə n oʊ z /), are a geographical, geological, and cultural region in Northeastern Pennsylvania.They overlook the Delaware River and Delaware Water Gap to the east, Lake Wallenpaupack to the north, Wyoming Valley and the Coal Region to the west, and the Lehigh Valley to the south.