Simple Lithology

ash breccia bomb or block tephra

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

definition Tephra in which more than 25 percent of particles are greater than 64 mm in largest dimension. Includes ash breccia, bomb tephra and block tephra of Gillespie and Styles (1999) more like this
source Schmid 1981; LeMaitre et al. 2002 more like this
type
Resource
Concept
broader tephra
narrower ash breccia bomb or block tephra
in scheme simplelithology
is primary topic of ash breccia bomb or block tephra