Dresbachian

Key events in the Cambrian
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Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary.
The Dresbachian is a Maentwrogian regional stage of North America, lasting from 501 to 497 million years ago. It is part of the Upper Cambrian and is defined by four trilobite zones. It overlaps with the ICS-stages Guzhangian, Paibian and the lowest Jiangshanian.