Types of sedimentary rocks
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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

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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


Biochemical sedimentary rock examples

Biochemical Sedimentary Rock Examples

Limestone

Coquina


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