Depth to bedrock is 8 to 20 inches. The mean annual soil temperature is 39 to 45 degrees F., and the mean annual summer soil temperature is 54 to 59 degrees F. Pebbles of semiconsolidated sandstone and siltstone range from 10 to 60 percent in the control section but break down upon pretreatment. Hard, consolidated coarse fragments range from 0 to 15 percent. Reaction is mildly through moderately alkaline. Calcium carbonate equivalent ranges from 15 to 40 percent in the less than 20 mm.
Reaction is moderately alkaline through strongly alkaline.
There are no competing series in the same family. Brownsto , Crago , and Luhon series are in the same subgroup and have bedrock deeper than 20 inches. The Conpeak soils are on hillslopes, ridges, and dissected pediments that have plane or convex surfaces. The slope gradient is commonly 5 to 20 percent but ranges from 2 to 45 percent. The soils formed in residuum and colluvial slopewash derived dominantly from sandstone and siltstone.