More on Sedimentary Rocks

Readers share their favorite sedimentary rocks.

An introduction to the second great class of rock types.

The major types of sedimentary rocks.

Sedimentary rocks arranged in order of grain size from small (chert) to large (breccia).

Ternary diagrams to help classify sedimentary rocks.

An essential tool in studying sedimentary rocks.

See a worldwide range of these sedimentary rock structures.

Show and describe your mysterious and sometimes beautiful concretions.See submissions

An assortment of conglomerates.

Photos of coquina, limestone composed of shelly fragments.

Examples of limestone and its features.

A set of pictures exploring this distinctive limestone variety.

An introduction to the geology of salt.

Sandstone is sand cemented together into rock.

Agate is both the state rock and the state gem of Nebraska, which may explain why the University of Nebraska hosts this home page for its deep content. The photo gallery is amazing.

That means, where sediments form and what kind of rocks they turn into. It's all linked to a clearly labeled diagram and explanation at the University of British Columbia.

An Australian site introduces these ugly lumps with gorgeous interiors. Includes good Australian collecting localities, in case you're there.

This "geobits" online pamphlet by the Illinois State Geological Survey is an authoritative and thorough look at these rock-show commonplaces.

From Southern Illinois University comes this gallery of coals and the stuff in them, under the microscope.

Karl-Peter Kelber's Links for Mineralogists site has a big grab-bag of rock-related sites for all levels of users.