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Types of Sedimentary Rocks

Types of Sedimentary Rocks

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Types of Sedimentary Rocks

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  1. Types of Sedimentary Rocks 8th Grade Earth and Space Science Class Notes

  2. Wednesday, 12/12/12 Warm – Up • Describe one feature you may observe in a sedimentary rock. • Write down the HW. Learning Goal – Describe the types of sedimentary rocks. Agenda • Warm-Up Question/Review HW • Check/correct the Section 6.1 Review Worksheet • Update Table of Contents • Class notes/discussion on the Types of Sedimentary Rocks • Sign up for Sedimentary Rock Lab Groups • Work on the Classification of Sedimentary Rocks WS and Section 6.2 Review Worksheet Homework – Section 6.2 Vocabulary due on Friday, 12/14 Section 6.2 Review Worksheet due on Friday, 12/14 Greek and Latin Roots Quiz #2 on Friday, 12/14

  3. Types of Sedimentary Rocks • Sedimentary rocks fall into one of three categories: • Clastic • Chemical • Biochemical

  4. Clastic Sedimentary Rocks • Formed from the abundant deposits of loose sediments that accumulate on the Earth’s surface • Classified based on the sediment size: • Coarse-grained • Medium-grained • Fine-grained

  5. Clastic Sedimentary Rocks Coarse-grained Rocks – contain gravel sized rock and mineral fragments • Conglomerate • Rounded particles • Breccia • angular particles

  6. Clastic Sedimentary Rocks Medium-grained Rocks – contain sand sized rock and mineral fragments • Sandstone • Contains quartz and rock • High porosity so often contains • oil, gas, and ground water • Arkose • Contains quartz, potassium feldspar • and rock

  7. Clastic Sedimentary Rocks Fine-grained Rocks – contains silt and clay sized particles • Shale • Quartz and clay • Very fine-grained • Siltstone • Quartz and clay • Fine-grained

  8. Chemical Sedimentary Rocks • Forms after the concentration of dissolved minerals reaches saturation and crystal grains settle out • Water evaporates and the minerals become more concentrated leading to thick layers on the bottom of a body of water. • Usually forms in areas that lack precipitation • See Table 6.1 in your textbook for examples and classification

  9. Chemical Sedimentary Rock Examples Rock Salt Microcrystalline Gypsum

  10. Biochemical Sedimentary Rocks • Form from the remains of once-living organisms • Most abundant is limestone (made of calcite) • Many contain fossils • See Table 6.1 for examples and classification

  11. Biochemical Sedimentary Rock Examples Limestone Coquina