Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
USA
-
Discoverer
Unknown
William Smith
Etymology
From pseudo- + tachylite, a glassy rock generated by frictional heat within faults.
From Old French marle, from Late Latin marglia
Class
Metamorphic Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
-
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock