Clastic sediment in which less than 30 percent of particles are gravel (greater than
2 mm in diameter) and the sand to mud ratio is at least 1. More than half of the particles
are of epiclastic origin.
source
definition of sand from SLTTs 2004 sandy sediment; particle sizes defined from Krumbein
phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition,
Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary
Petrography: New York, Appleton Century Co., Inc.)
