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Coquina Limestone Biochemical sediment Shells, coral fragments, calcareous microfossils Mostly sand size shell fragments effervesces in HCL |
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Sedimentary Rock Coal Biochemical plant fragments and/or charcoal black layered brittle rock |
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Sedimentary Rock Chert Mineral crystals (inorganic) microcrystalline varieties of quartz may break with conchoidal fracture hard, scratches glass may contain fossils as the silica in most chert is derived from dissolution of siliceous phytoplankton ooze |
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Sedimentary Rock Arkose Sandstone Detrital sediment grains, fragmented rocks and/or silicate mineral crystals derived from mechanical and chemical weathering of continental land Detrital sediment is also called terrigenous mostly feldspar |
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Sedimentary rock Chalk Biochemical sediment grains Shells and coral fragments (calcareous microfossils) silty earthy rock comprised of the microscopic shells of calcareous phytoplankton limestone carbonate calcareous rocks |
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Sedimentary Rock Shale detrital sediment grains, fragmented rocks and/or silicate mineral crystals no visible grains mostly clay may contain fossils fissile - splits easily into layers mudstone |
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Sedimentary Rocks Dolostone mineral crystals -inorganic microcrystalline dolomite effervesces in dilute HCL only if powdered Usually light colored evaporite rocks |
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Sedimentary rock Calcarenite Biochemical sediment grain Shells coral fragments calcareous microfossils mostly sand sized shell fragments often contains a few larger fossil shells Fossiliferous Limestone |
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Sedimentary Rock Conglomerate Detrital sediment grains rock fragments, quartz/ feldspar/ clay minerals Rounded gravel, poorly sorted grains 2mm |
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Sedimentary rock Breccia Detrital sediment rock fragment quartz/feldspar/ clay minerals angular gravel, poorly sorted, grains larger that 2 mm |
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