| Term: | Erratic |
| Definition: | A large rock boulder that has been transported by glaciers away from its origin and deposited in a region of dissimilar rock. |
| Term: | Erratic |
| Definition: | A rock of unspecified shape and size, transported a significant distance from its origin by a glacier or iceberg and deposited by melting of the ice. Erratics range from pebble-size to larger than a house and usually are of a different composition that the bedrock or sediment on which they are deposited. |