Simple Lithology

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
Concept
broader tephra
narrower ash and lapilli
in scheme simplelithology
is primary topic of ash and lapilli