U.S. Geological Survey East-Coast Sediment Texture Database
Shepard's Classification System
(A) Sediment classification scheme modified from Shepard (1954) and published by Schlee (1973). (B) Sediment classification scheme modified from Shepard (1954) and used by the Schlee and Webster (1967) programs, GSTAT, GSTATM, and GSSTAT (Poppe and others, 2004).