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sediments and rocks are comprised mostly of the remains of organisms, such as shells, plant fragments, and carbon.
biochemical rocks form when these materials go through lithificaiton as layers of these materials are compacted (pressure-hardened) or cemented (glued together by tiny crystals or chemical residues precipitated from fluids in the pores of sediment) |
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Sediments and rocks are comprised mostly of inter grown mineral crystals precipitated form aqueous solutions and chemical residue.
Chemical rocks form a dense hard mass directly as they precipitate from aqueous solutions. |
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| sediments and rocks are composed of detrital grains--worn rock fragments and minerals grains that were weathered and transported form their source. detrital rocks form when these materials go through lithificaiton as layers of these materials are compacted (pressure-hardened) or cemented (glued together by tiny crystals or chemical residues precipitated from fluids in the pores of sediment) |
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| ocean or marine environment |
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| Shells, bimodal cross-bedding, oscillation ripple marks. chert. |
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| Muddy Bay or estuary environment |
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| gray silty mudstone (shale) with animal burrows, fossil plant fragments, and current ripple marks. |
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| Red and gray silty mudstone with raindrop impressions, fossil roots, and mudcracks. foot prints and fossil ferns. |
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| Evaporating bay environment |
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| gray silty mudstone with abundant gypusm layers and crystals. |
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[image]
Grains all mostly the same size. |
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[image]
Grains are usually about two different sizes. |
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[image]
Grains are all different sizes. |
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