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9 Cards in this Set
- Front
- Back
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what does a rock's color indicate?
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clues on oxygen level of the depositions environment (where it originated from)
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what does black indicate of a rock?
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large amounts of organic material; organic carbon ($); anoxic (poor oxygen and below water); swamps, lagoon, deep ocean
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what does a white/grey rock indicate?
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shallow moving h2o (well oxygenated); rivers, shallow ocean, beaches.
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what does a red/brown rock indicate?
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mostly O2; land/exposed to air; deposited by wind/water (left high and dry exposing it to atm.); red = iron oxide or rust; formed on continents (desert, alluvial fans, floodplains [soils])
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what does grain size indicate of a rock?
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clues into the energy of the depositional environment.
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what types of rocks are fine sized?
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(low energy) Mud and when pressurized -> shale; silt -> siltstone; clay -> claystone
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where are fine size grains found? (like mud and shale)
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floodplains or ocean floor; low energy
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what rocks have grain size I'm between fine and coarse?
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(medium energy) sand [wind doesn't allow for it to stay deposited] -> sandstone
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what rocks have coarse grain size?
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(High energy) gravel -> conglomerate
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