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.
