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- https://geo.libretexts.org/Bookshelves/Geology/Mineralogy_(Perkins_et_al.)/07%3A_Sedimentary_Minerals_and_Sedimentary_Rocks/7.04%3A_Sedimentary_Minerals/7.4.07%3A_ChertChert is a fine-grained (microcrystalline) variety of quartz. Chert has many appearances; the five photos below (Figures 7.59 to 7.63) show examples of some of the more common varieties. Jasper is che...Chert is a fine-grained (microcrystalline) variety of quartz. Chert has many appearances; the five photos below (Figures 7.59 to 7.63) show examples of some of the more common varieties. Jasper is chert with a characteristic red color due to hematite inclusions. Opal and chalcedony, two other types of silica, are often associated with chert deposits. From the Stone Age until the Industrial Revolution, chert and flint were highly valued for use as weapons, tools, and fire starters.
- https://geo.libretexts.org/Courses/SUNY_Potsdam/Sedimentary_Geology%3A_Rocks_Environments_and_Stratigraphy/07%3A_Chemical_Biochemical_and_Other_Sedimentary_Rocks/7.02%3A_Siliceous_Sedimentary_RocksSiliceous sedimentary rocks direct precipitation from silica-saturated waters, from the accumulation of siliceous skeletal material, or pedogenic processes. There are a variety of mineralogical and g...Siliceous sedimentary rocks direct precipitation from silica-saturated waters, from the accumulation of siliceous skeletal material, or pedogenic processes. There are a variety of mineralogical and gem names for microcrystalline quartz. Bedded cherts, nodular cherts within other rocks, Banded Iron Formations (BIFs), and silcretes are the most common siliceous sedimentary rocks.
- https://geo.libretexts.org/Courses/SUNY_Potsdam/Sedimentary_Geology%3A_Rocks_Environments_and_Stratigraphy/05%3A_Siliciclastic_Sedimentary_Rocks/5.01%3A_SandstonesSandstones are made largely of sand-sized grains between 1/16 and 2 mm. They are composed of framework grains and have interstitial matrix, cement, and or pore space between these grains. They are c...Sandstones are made largely of sand-sized grains between 1/16 and 2 mm. They are composed of framework grains and have interstitial matrix, cement, and or pore space between these grains. They are classified based on the relative abundance of quartz, feldspar, and lithic grains and the nature of the interstitial materials.
- https://geo.libretexts.org/Courses/SUNY_Potsdam/Sedimentary_Geology%3A_Rocks_Environments_and_Stratigraphy/08%3A_Diagenesis/8.02%3A_Diagenetic_StructuresA variety of distinctive structures form in association with diagenesis. Beyond being potentially visually striking features, these structures record processes such as the precipitation of minerals, ...A variety of distinctive structures form in association with diagenesis. Beyond being potentially visually striking features, these structures record processes such as the precipitation of minerals, dissolution, surface processes, and bioturbation.
- https://geo.libretexts.org/Courses/SUNY_Potsdam/Sedimentary_Geology%3A_Rocks_Environments_and_Stratigraphy/10%3A_Depositional_Environments/10.04%3A_Clastic_Marine_EnvironmentsPericontinental seas mark the transition from the continents to the open oceans. Environments include the shelf (dominated by storm waves and tides on its landward side and suspension deposition on i...Pericontinental seas mark the transition from the continents to the open oceans. Environments include the shelf (dominated by storm waves and tides on its landward side and suspension deposition on its seaward side), the relatively steep continental slope (dominated by suspension deposition, slumping, and turbidite generation), the continental rise (dominated by turbidite deposition), and the abyssal plain (dominated by suspension deposition of mud, calcareous oozes, and siliceous oozes).
