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The Lower Cambrian is characterized by the presence of a trilobitic fauna in which the genus Olenellus is predominant.
From The Elements of Geology by William Harmon Norton
When we turn to the crustaceans we have to deal with two distinct assemblages, one purely marine, trilobitic, the other mainly lacustrine or lagoonal with a eurypteridian facies.
From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" by Various
