Lyons Formation

Lyons Sandstone Stratigraphic range: Middle Permian
Buff and pink rocks typical of The Lyons Formation seen on the right at Roxborough State Park near Littleton, Colorado
Type	sedimentary
Underlies	Lykins Formation
Overlies	Fountain Formation
Thickness	50-220 ft
Lithology
Primary	sandstone, conglomerate
Location
Region	Denver Basin
Extent	Colorado, Wyoming
Type section
Named for	Lyons, Colorado

Lyons Sandstone is a geological layer formed during the Paleozoic Era, Middle Permian Period about 250 million years ago. This layer is also referred to as the Lyons Formation. It is the result of fine-grained quartz sand dunes compressing into sandstone. This layer is visible along the Front Range of the Colorado Rocky Mountains.

The stone quarried from this layer was used to build many buildings on the University of Colorado - Boulder campus.