Simple Lithology

mud

http://resource.geosciml.org/classifier/cgi/lithology/mud

broader clastic sediment
narrower mud
mud size sediment
narrower mud
definition Clastic sediment consisting of less than 30 percent gravel-size (2 mm) particles and with a mud-size to sand-size particle ratio greater than 1. More than half of the particles are of epiclastic origin. more like this
narrower clay
broader mud
silt
broader mud
source definition of mud from SLTTs 2004 muddy 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.) more like this
type
Resource
Concept
in scheme simplelithology
is primary topic of mud