#middle cambrian
Trilobite (Elrathia kingii) fossil
Millard County, Utah, Middle Cambrian period
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Laurentia (North America)* // Middle Cambrian (500 million years ago) // Arthropoda//image source
Fun Fact: Opabinia was about the size of a mouse and had 5 eye stalks. Several specimens were found in the famous Burgess Shale.
*During the Cambiran period, the Earth’s geography was vastly different from today’s (this was even before Pangaea!). The ancient land mass that later became North America is called Laurentia. You can see a map of Cambrian Earth here.
