Below are examples of the symbols used in geologic diagrams and maps to represent specific kinds of rocks. If bedding, cross-bedding, ripples, fossils, distortion, or certain materials are present in the rock, the symbols are altered. To download the complete list of standard symbols, click here.
 Gravel/conglomerate |  Breccia |  Bedded sandstone |  Clay shale |
 Limestone |  Metamorphic |  Gneiss |  Igneous |
