[3] The formation consists of yellow-gray quartz sandstone with minor siltstone.

[2] It overlies the Pajarito Formation and is in turn overlain by the Graneros Shale.

[1] The formation is interpreted as the onset of a marine transgression of the Greenhorn cycle.

[1] The formation was first named by Kues and Lucas in 1987 for previously undivided Dakota Group beds at the Romeroville Gap.

Kues and Lucas also identified it at Clayton Lake and in the valley of the Dry Cimarron.