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Limestone, shale, sandstone, and dolomite
- About half a billion years ago, the rocks that now make up the Shenandoah Valley solidified from ancient tidal flat sediments into vast, horizontal layers of limestone, shale, sandstone, and dolomite.
www.nps.gov/articles/000/shenandoah-valley-geology.htmGeology of the Shenandoah Valley - U.S. National Park Service
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Aug 16, 2022 · Many rocks and minerals occupy the Shenandoah Valley besides limestone. Other sedimentary rocks in the region are sandstone, shale, and coal. There are igneous rocks like granite, gabbro, and basalt, and metamorphic rocks like slate, gneiss, and quartzite.
Oct 26, 2023 · In the valleys and ridges to the west, thick sequences of limestone and other marine rocks preserve evidence for the rest of this underwater period. The ancient Grenville rocks, the lava flows, and the sediments represent the three main geologic units found within Shenandoah.
Today in Shenandoah National Park, the rocks of the Chilhowee Group form steep ridges and hollows that are covered in eroded rock debris called talus. These rocks have experienced weathering which has created soil able to support vegetation.
May 30, 2023 · Learn more about the rocks that make Shenandoah. Basement rocks, left over from a mountain range even older than the Appalachians, form the foundation upon which the Shenandoah Blue Ridge rises. Over one billion years old, they can still form dramatic topography, creating the rounded, boulder-strewn summits of Old Rag Mountain, Hogback Mountain ...
The Shenandoah National Park is underlain by three general groups of rock units: (1) Mesoproterozoic granitic gneisses and granitoids, (2) Neoproterozoic metasedimentary rocks of the Swift Run Formation and metabasalt of the Catoctin Formation, and (3) siliciclastic rocks of the Lower
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Molten magma, miles beneath the earth's surface, slowly solidified to become the "basement rock," or core, of what we know today as the Blue Ridge Mountains. For the next 500 million years, erosion and the uplifting of the earth's crust exposed the granitic basement rock.
Sep 3, 2009 · The Page Valley is underlain by Cambrian and Ordovician carbonate rocks. Siliciclastic rocks are mostly west of the South Fork of the Shenandoah River and underlie Massanutten Mountain. Surficial deposits in the highlands include colluvium and debris fans.