http://resource.geosciml.org/classifier/cgi/lithology/tephra
broader |
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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. | |||||||||||
narrower |
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source | Hallsworth and Knox 1999; LeMaitre et al. 2002 | |||||||||||
type |
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in scheme | simplelithology original |