Definition
Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
New Zealand
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Discoverer
Patrick Marshall
William Smith
Etymology
From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite
From Old French marle, from Late Latin marglia
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock