The Weeks Formation is a geologic formation in Utah.

It preserves fossils dating back to the Cambrian period and more specifically the Guzhangian stage.

Its upper part has yielded a diverse fauna dominated by trilobites and brachiopods, but also comprising various soft-bodied organisms, such as Falcatamacaris.

This article about a specific stratigraphic formation in Utah is a stub.

This article related to the Cambrian period is a stub.