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The Entrada Sandstone is a formation in the San Rafael Group found in the U.S. states of Wyoming, Colorado, northwest New Mexico, northeast Arizona, and southeast Utah. Part of the Colorado Plateau , this formation was deposited during the Jurassic Period sometime between 180 and 140 million years ago in various environments, including tidal ...
Blue Granite – Variety of monzonite, an igneous rock; Epidosite – Hydrothermally altered epidote- and quartz-bearing rock; Felsite – Very fine-grained volcanic rock that sometimes contains larger crystals; Flint – Cryptocrystalline form of the mineral quartz; Ganister – Hard, fine-grained quartzose sandstone, or orthoquartzite
Decomposed granite is a kind of granite rock that is weathered to the point that the parent material readily fractures into smaller pieces of weaker rock. Further weathering yields material that easily crumbles into mixtures of gravel -sized particles known as grus that further may break down to produce a mixture of clay and silica sand or silt ...
The Slickrock Trail consists of three main sections: An out-and-back lead-in (akin to the stick of a lollipop or stem of a cherry), the main 6.8-mile (10.9 km) loop (akin to the fruit of a cherry or the candy part of a lollipop), and an optional 2.3-mile (3.7 km) practice trail (also called the practice loop, although it is not literally a loop) that begins and ends at separate points on the ...
Greywacke or graywacke (German grauwacke, signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness (6–7 on Mohs scale), dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or sand-size lithic fragments set in a compact, clay-fine matrix.
It is the best and most widely known example of a flexible sandstone, and is a source of diamonds found in the Minas Gerais area of Brazil. [2] On the split faces of the slabs, scales of greenish mica are visible, but in other respects, the rock seems to be a remarkably pure specimen consisting of quartz. If a slab measuring 30-60 centimetres ...
Tafoni at Salt Point State Park, Sonoma County, California.. Tafoni (singular: tafone) are cavities that develop in granular rock.. Although various definitions [example needed] can be found [by whom?] in the scientific literature, tafoni are commonly defined as small (less than 1 cm (0.39 in)) to large (greater than 1 meter (3.3 ft)) cavity features that develop in either natural or manmade ...
Slickenlines at 500m depth in a Permian sandstone In geology , a slickenside is a smoothly polished surface caused by frictional movement between rocks along a fault . This surface is typically striated with linear features, called slickenlines , in the direction of movement.
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