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The Old Red Sandstone was long thought to have been deposited mostly in freshwater, but more recent studies have discovered marine fossils (such as brachiopods) [5] in some locations, its vertebrate fauna also occurs in typically marine environments, [6] and an isotopic study also found significant marine influence in mineralised tissues of its ...
Jacobsville Sandstone is a red sandstone formation, marked with light-colored streaks and spots, primarily found in northern Upper Michigan, portions of Ontario, and under much of Lake Superior. Desired for its durability and aesthetics, the sandstone was used as an architectural building stone in both Canada and the United States.
Red beds (or redbeds) are sedimentary rocks, typically consisting of sandstone, siltstone, and shale, that are predominantly red in color due to the presence of ferric oxides. Frequently, these red-colored sedimentary strata locally contain thin beds of conglomerate , marl , limestone , or some combination of these sedimentary rocks.
Exeter, Devon, ancient city walls of Isca Dumnoniorum with medieval and Roman elements. The New Red Sandstone, chiefly in British geology, is composed of beds of red sandstone and associated rocks laid down throughout the Permian (300 million years ago) to the end of the Triassic (about 200 million years ago), that underlie the Jurassic-Triassic age Penarth Group. [1]
The red hematite that gives red bed sandstones their color is likely formed during eogenesis. [13] [14] Deeper burial is accompanied by mesogenesis, during which most of the compaction and lithification takes place. [11] Compaction takes place as the sand comes under increasing pressure from overlying sediments.
Initially, this iron accumulated as iron-oxide coatings, which formed slowly after the sand had been deposited. Later, after having been deeply buried, reducing fluids composed of water and hydrocarbons flowed through the thick red sand which once comprised the Navajo Sandstone.
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Ohio bluestone, also found in Northeast Ohio in certain streambeds [8] [9] and used as dimension stone; Pennsylvania Bluestone in northeast Pennsylvania and adjoining parts of New Jersey and New York; Stockton Sandstone: in western New Jersey along the Delaware River; Potsdam Sandstone: in upstate New York