Keywords

Tephra



Keyword 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.

Hallsworth & Knox 1999; LeMaitre et al. 2002

Parents: Natural unconsolidated material (173); Pyroclastic material (206)

Children: Ash and lapilli (20); Ash breccia, bomb, or block tephra (21)

[Description taken from GeoSciML SimpleLithology201012.rdf]



Hierarchical classification

Compound material >> Igneous >> Fragmental >> Pyroclastic >> Tephra

Children

Ash and lapilli | Ash breccia, bomb, or block


Category: Analysed material

The different kinds of sample material collected in the field have been classified hierarchically. Examples: “till”, “soil”, “vegetation”. Taken from the “Sample_Types_SHARED” database table.


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