Encyclopedia of Earth
Encyclopedia of Earth: Geology: Limestone
Article explaining what limestone is, how it is formed, where it occurs, the different types, and how it has been used throughout history. (Published: August 8, 2010)
James Madison University
James Madison University: Clastic Sedimentary Rock Classification
An upper-level explanation of clastic sedimentary rock classification. Charts, diagrams, and review questions are included. Be sure to click on the PDF Clastic Identification key.
University of Kentucky
University of Kentucky: Rocks and Minerals: Sedimentary Rocks
An excellent resource for learning about sedimentary rocks and how they form. The different types of sedimentary rocks and deposits found in Kentucky are listed, with links to dedicated pages for each. Covers clay, shale, sandstone,...
Other
Geology.com: Rocks: Pictures of Sedimentary Rocks
Presents photographs of examples of clastic, chemical, and organic sedimentary rocks, with short descriptions underneath each rock image. Each rock name is also linked to its own dedicated page with a great deal of additional information...
University of Kentucky
University of Kentucky: Rocks and Minerals: Sedimentary Rocks: Sandstone
The cementing of minerals together forms a sedimentary rock called sandstone. One form of sandstone is rock asphalt. Learn more about it here.
CK-12 Foundation
Ck 12: Earth Science: Sedimentary Rock Classification
[Free Registration/Login may be required to access all resource tools.] Explains that sedimentary rocks are classified by how they formed and by grain size.