How Sedimentary Rock Is Formed

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How Sedimentary Rock Is Formed




For thousands, even millions of years, little pieces of our earth have been eroded--broken down and worn away
by wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock.

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Shale Rocks


Shale rock is a type of sedimentary rock formed from clay that is compacted together by pressure. They are used to make bricks and other material that is fired in a kiln.

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Limestone Rocks


Limestone rocks are sedimentary rocks that are made from the mineral calcite which came from the beds of evaporated seas and lakes and from sea animal shells. This rock is used in concrete and is an excellent building stone for humid regions.

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Sandstone Rocks


Sandstone rocks are sedimentary rocks made from small grains of the minerals quartz and feldspar. They often form in layers as seen in this picture. They are often used as building stones.

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Conglomerate Rocks


Conglomerate rocks are sedimentary rocks. They are made up of large sediments like sand and pebbles. The sediment is so large that pressure alone cannot hold the rock together; it is also cemented together with dissolved minerals.

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Gypsum Rocks


Gypsum rocks are sedimentary rocks made up of sulfate mineral and formed as the result of evaporating sea water in massive prehistoric basins. It is very soft and is used to make Plaster of Paris, casts, molds, and wallboards.

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NAME: BAUXITE

TYPE: Chemical Sedimentary Rock
Bauxite is an ore of aluminum and the State Rock of Arkansas

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NAME: BRECCIA

TYPE: Clastic Sedimentary Rock

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NAME: MICRITE

TYPE: Chemical Sedimentary Rock

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NAME: QUARTZ SANDSTONE

TYPE: Clastic Sedimentary Rock

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NAME: FOSSILIFEROUS LIMESTONE

TYPE: Chemical Sedimentary Rock

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NAME: CHALK

TYPE: Chemical Sedimentary Rock