Latah Formation

The Latah Formation is a series of late Miocene lacustrine sedimentary deposits which outcrop in eastern Washington and northwestern Idaho.

The lake beds are interbedded with igneous rock of the Columbia River Basalt Group.

[1] When first described the formation was thought to have predated the deposition of the Columbia River Basalts, however further investigation showed them to be interbedded, being laid down in successive events.

[1] The Latah Formation includes the Clarkia fossil beds in Idaho.

This article about a specific stratigraphic formation in the United States is a stub.