Simple Lithology

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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.