The Cambrian Period
The Cambrian Period was the time when trilobites reached their peak. The period spanned 35,000,000 years and produced thousands of species. The word Cambrian is of Latin origin and means Wales. Scientists first studied exposed cambrian rock around 1835. The largest Cambrian exposures in North America extend from Southern California to British Columbia, Canada. Trilobites died out in great numbers at the end of this period.

Eccaparadoxides sp.
Age: M. Cambrian
Location: France
Olenoides nevadensis
Age: M. Cambrian
Location: Utah
Elrathia kingii
Age: M. Cambrian
Location: Utah
Modocia typicalis
Age: M. Cambrian
Location: Utah
Tricrepicephalus coria
Age: U. Cambrian
Location: Utah
Acadoparadoxides briaraeus
Age: M. Cambrian
Location: Morocco
Glossopleura sp.
Age: M. Cambrian
Location: California
Olenellus gilberti
Age: L. Cambrian
Location: Nevada
Bristolia bristolensis
Formation: Latham Shale
Age: L. Cambrian
Location: California
Asaphiscus wheeleri
Wheeler Age: M. Cambrian
Location: Utah
Hatangia scita
Age: M. Cambrian
Location: Siberia
Albertella helena
Formation: Age: M. Cambrian
Location: Nevada
Lyriaspis sigillum
Age: M. Cambrian
Location: Australia
Elrathina sp.
Formation: Wheeler
Age: M. Cambrian
Location: Utah
Peronopsis interstrictus
Formation: Wheeler
Age: M. Cambrian
Location: Utah
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Cambrian
Ordovician  
Silurian    
Devonian  
Mississippian,
Pennsylvanian &
Permian

Cambrian
Trilobites
543-490  MYA
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