Simple Lithology

tephra

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

broader natural unconsolidated material
narrower tephra
pyroclastic material
narrower tephra
definition Unconsolidated pyroclastic material in which greater than 75 percent of the fragments are deposited as a direct result of volcanic processes and the deposit has not been reworked by epiclastic processes. Includes ash, lapilli tephra, bomb tephra, block tephra and unconsolidated agglomerate. more like this
narrower ash and lapilli
broader tephra
ash breccia bomb or block tephra
broader tephra
source Hallsworth and Knox 1999; LeMaitre et al. 2002 more like this
type
Resource
Concept
in scheme simplelithology
is primary topic of tephra