Tenorio soils have calcareous 2C horizons. The soils formed in thin sandy medium to moderately fine textured noncalcareous alluvium derived principally from granite bedrock or arkose deposits. These are the Bijou and Truckton soils. Bijou soils have a moderately coarse textured argillic horizon and have coarse textured C horizons at depths of 20 inches or more. Truckton soils have mollic epipedons, lack contrasting layers in the substratum and have less clay in the upper part of the particle-size control section.
Native vegetation is fringed sage, cactus, yucca, blue grama, and needle and thread grass.
The series is of small extent. East Elbert County, Colorado, 1964. Updated the classification, competing series and placed in semi-tab format.