Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
USA
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Discoverer
Unknown
William Smith
Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
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