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

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types of sedimentary rocks

Types of Sedimentary Rocks

8th Grade Earth and Space Science

Class Notes

wednesday 12 12 12
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

types of sedimentary rocks1
Types of Sedimentary Rocks
  • Sedimentary rocks fall into one of three categories:
    • Clastic
    • Chemical
    • Biochemical
clastic sedimentary rocks
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
clastic sedimentary rocks1
Clastic Sedimentary Rocks

Coarse-grained Rocks – contain gravel sized rock and mineral fragments

  • Conglomerate
  • Rounded particles
  • Breccia
  • angular particles
clastic sedimentary rocks2
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
clastic sedimentary rocks3
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
chemical sedimentary rocks
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
chemical sedimentary rock examples
Chemical Sedimentary Rock Examples

Rock Salt

Microcrystalline Gypsum

biochemical sedimentary rocks
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