Definition
Marl is an unconsolidated sedimentary rock consisting of clay and lime
Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers
History
Origin
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Discoverer
William Smith
Unknown
Etymology
From Old French marle, from Late Latin marglia
From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Soft Rock
Family
Group
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock