Sandstone..............

Seneca Sandstone, Smithsonian Institution

Geology of Washington, DC

GEOLOGY CATEGORIES

• Minerals & Gemstones
• About Rocks & Rock Collecting
• Landforms and Geologic Features
• Earthquakes, Volcanoes and Other Natural Hazards
• Geologic Maps
• Climate Change, the Ocean, Glaciers and the Atmosphere
• Fossils, Geologic Time and Evolution
• Geology and Civilization
• The Deep Earth and Other Planets
• Blog
• Basics of Geology
• Geological Phenomena & Events
• Geologic Images & Maps
• Updated Articles and Resources 

FREE EMAIL NEWSLETTER

Let About.com send you
the latest from our
Geology Expert.

You can opt-out at any time.
Please refer to our privacy policy for contact information.

Other than its gradual darkening, Seneca sandstone is an excellent material: easily carved, clean and durable. (click full size)