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Sedimentary Rock

Sedimentary rocks are formed from "sediments", that is when igneous or metamorphic rocks have broken down in the weathering process into individual grains and have been washed to the bottom of a river bed or lake.

These grains are pressed into another sort of rock by the pressure of the surrounding material. The new rock is called "sedimentary", and is made of material from the other two forms of rock. The grains which compose it can usually be seen with the naked eye, such as in the sandstone shown here.

Sedimentary rocks provide abundant information about the most recent half-billion years of the earth's history. They contain in fossil form the preserved remains of ancient animals and plants. The manner in which particles of sediment are worn and deposited, the relationships of the different layers, these are among the evidences of the sequence of geologic events.


This image shows a type of sedimentary rock.
Click on image for full size version (92K JPG)
Image from: C. Alexander

A listing of Rocks

Rock Image Archive


Sedimentary Rock

Sedimentary rocks are formed from "sediments", that is when igneous or metamorphic rocks have broken apart from weathering into little grains and have been washed to the bottom of a river bed or lake.

These little grains get pressed into another sort of rock by the pressure of the surrounding material. The new rock is called "sedimentary", and is made of material from the other two forms of rock. The grains which compose it can usually be seen with the naked eye, such as in the sandstone shown here.

Sedimentary rocks provide abundant information about the most recent half-billion years of the earth's history. They contain in fossil form the preserved remains of ancient animals and plants. The manner in which particles of sediment are worn and deposited, the relationships of the different layers, these are among the evidences of the sequence of geologic events.


This image shows a type of sedimentary rock.
Click on image for full size version (92K JPG)
Image from: C. Alexander

A listing of Rocks

Rock Image Archive


Sedimentary Rock

Sedimentary rocks are formed when igneous or metamorphic rocks have broken apart from weathering into little grains and have been washed to the bottom of a river bed or lake.

These little grains get pressed into another sort of rock by the pressure of the surrounding material. The new rock is called "sedimentary", and is made of material from the other two forms of rock. The grains which compose it can usually be seen with the naked eye, such as in the sandstone shown here.

Sedimentary rocks provide information about the past years of the earth's history. They contain many fossils of ancient animals and plants.

This image shows a type of sedimentary rock.
Click on image for full size version (92K JPG)
Image from: C. Alexander

A listing of Rocks

Rock Image Archive




Last modified January 15, 1998 by the Windows Team

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