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ash and lapilli

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

definition Tephra in which less than 25 percent of fragments are greater than 64 mm in longest dimension more like this
source Schmid 1981; LeMaitre et al. 2002 more like this
type
Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/lithology/tephra original
narrower ash_and_lapilli original
in scheme simplelithology original
is primary topic of ash_and_lapilli