Definition
Limestone is a sedimentary rock composed mostly of calcite and aragonite, which are different crystal forms of calcium carbonate
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
New Zealand
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Discoverer
Belsazar Hacquet
William Smith
Etymology
From lime and stone in late 14th Century
From Old French marle, from Late Latin marglia
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock