The Cayugan Series contains a number of carbonate, shale and evaporite formations of the upper Silurian System of sedimentary strata in eastern North America.

The end of the Taconic orogeny marks the beginning of the Cayugan.

A number of changes were taking place as the Iapetus Ocean was slowly shrinking.

A result of being closed at one end was that fluctuations in sea level allowed for large parts of the Appalachian and Michigan basins to form large evaporite deposits.

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