- Middle Cambrian
The Middle Cambrian (also known as Albertan, Acadian, St. David's, or Saint David's) is the second of three geological epochs of the
Cambrianperiod. It spans the time between 513 ± 2 Ma and 501 ± 2 Ma (million years ago). The strange organisms of the Burgess Shale fossilsite lived during this epoch. The Middle Cambrian is divided into two unnamed ICS stages.
List of fossil sites"(with link directory)"
* [http://www.stratigraphy.org/geowhen/stages/Middle_Cambrian.html GeoWhen Database - Middle Cambrian]
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