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Exploring Chemical Sedimentary Rocks: Types and Formation in Earth's History

Learn about chemical sedimentary rocks, including limestone, chert, travertine, geodes, and evaporites, formed through various processes like precipitation, silica filling, and crystal formation. Discover how fossils in these rocks provide insights into ancient environments. Unearth the history of Earth's surface through the study of these unique rock formations.

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Exploring Chemical Sedimentary Rocks: Types and Formation in Earth's History

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  1. Chemical Sedimentary Rock Hill Science 6

  2. Chemical Sedimentary Rock • Most common chemical sedimentary rock is limestone. • Forms in shallow sea water • CaCO3 precipitates out of sea water and forms limestone.

  3. To Create a Precipitate

  4. Chemical Sedimentary Rock • Chert – silica flint, agate and jasper • Yellowstone travertine - CaCO3 from hot springs agate chert

  5. Chemical Sedimentary Rock • Geodes – silica filled cavities in limestone left by gas or organic matter that has decayed

  6. Chemical Sedimentary Rock • Evaporites – crystals form when water evaporates gypsum, halite

  7. Sedimentary Rocks • Tell us what the Earth's surface was like in the past. • Only sedimentary rocks contain fossils! • Fossils can tell us about ancient plants, animals, and climates.

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