Cebolla's physical, well-drilling log into the Morrison Formation confirms numerous geological surveys and maps of the Rios Gallina and Chama Watersheds.
Mancos Shale and Elpedro soil ARE Cebolla's SURFACE, into which seasonal water wells were historically dug.
Under the Mancos is a thin layer of Greenhorn Limestone.
Dakota Sandstone, thereunder, is above a pressurized, easily- recharged, & water-bearing Morrison Formation.
Groundwater quality is maintained by very high altitude recharge in the Rios Gallina and Chama Watersheds.