Sedimentary rocks form near the Earth's surface, wherever sediments can pile up and be gradually buried. The rocks in this gallery are arranged in order of their grain size: smooth chert through gritty sandstone to stony conglomerate.
 Chert Nodule Interior |  Chert Nodule Exterior |  Red Chert |  Radiolarian Chert |
 Banded Iron Formation |  Bituminous Coal |  Anthracite Coal |  Limestone |
 Dolomite |  Shale, Pleistocene |  Shale, Cretaceous |  Siltstone |
- Graphic Index
- Text Index
PreviousNext
