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The 'Middle Cambrian' (also known as 'Albertan', 'Acadian', 'St. David's', or 'Saint David's') is the second of three geological epochs of the Cambrian period. It spans the time between 513 ± 2 Ma and 501 ± 2 Ma (million years ago). The strange organisms of the Burgess Shale fossil site lived during this epoch. The Middle Cambrian is divided into two unnamed ICS stages.

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See Also

References

See Also

★ List of fossil sites ''(with link directory)''

References

★ GeoWhen Database - Middle Cambrian