Shepard Classification Scheme
Sediment classification scheme modified from Shepard (1954) used by the programs GSTAT, GSTATM, and GSSTAT.
Shepard Classification SchemeSediment classification scheme modified from Shepard (1954) used by the programs GSTAT, GSTATM, and GSSTAT.
Shepard Classification SchemeIn displaying the lithologic descriptors, the general ranking principle of the main constituents (e.g. gravel, sand) and modifying constituents (e.g. sandy, silty) follows in order of decreasing coarseness. The sediment classification color assignment is represented by the following legend:
| Sediment Classification | |
|---|---|
| Color | Sediment Main Phase |
| Red - sediment whose main phase is gravel (>50%); rocky bottom | |
| Orange - sediment with significant amounts of gravel (>10%, but <50%) | |
| Yellow - sediment whose main phase is sand without significant gravel or mud | |
| Green - sediment with significant (>20%) sand, silt, and clay | |
| Blue - sediments whose main phase is silt (>50% | |
| Purple - sediments whose main phase is clay (>50%) | |
Available overview maps of the sediment classes for several selected U.S. Atlantic East Coast regions are available below. Maps are available in both JPEG image format and Adobe PDF.