40.4 Crossing low alluvial terrace of Smoky Hill River. 41.0 Terrace alluvium overlain by loesslike silt exposed in roadcut on right. 41.2 Sloping surface on right is a flanking pediment. 41.3-41.4 Smoky Hill Chalk Member exposed in roadcut and mantled by loess. Chalk con- tains Inoceramus and Ostrea. 41.6 Loess and terrace alluvium poorly exposed in cut on right. 41.9-42.1 Terrace alluvium poorly exposed in roadcut. 42.2 Crossing low alluvial terrace. 42.3 Smoky Hill Chalk Member exposed ahead and to left in cliffed bluff overlooking valley of Smoky Hill River. Note anomalous dips owing to flexure. 42.8-43.1 Smoky Hill Chalk Member, Pierre Shale, and loess exposed in long, deep roadcut. Normal fault at 43.0 dropped Pierre to level of Smoky Hill Member. Pierre over- lain by thick deposit of loess. 43.3 Erosional pillar of Smoky Hill in pasture on right. 43.6 Gullied alluvial terrace on left. 43.8 Terrace alluvium exposed in arroyo on right. Just east is roadcut in loess overlain by alluvium (sand) of high-level terrace. Note buried soil (dark) within loess. 44.0 Note relatively steep dip in exposure of Smoky Hill Member in bluff of Smoky Hill River at 10 o'clock. 44.1 Weathered Smoky Hill overlain by (ascending) loess and terrace alluvium (sand), all exposed in roadside ditch on right. Note buried soil (dark) in loess. 44.4 Terrace alluvium (sand), and silt (probably loess), exposed in low roadcut. 44.8-44.9 Smoky Hill Chalk Member, Pierre Shale, and loess, exposed in roadcut. Pierre slope littered with large selenite crystals. 45.2 Loess exposed in roadcut on right. 45.5 Crossing low alluvial terrace of Smoky Hill River. 47.8 Junction Kansas Highway 25 and Logan County Highway 407. Proceed on K-25. 48.8 Smoky Hill Chalk Member exposed in bluffs on right at 2 o'clock. 48.9 Smoky Hill veneered by colluvium of small flanking pediment in low roadcut. 49.2 Smoky Hill Chalk Member and overlying alluvium well exposed in arroyo on right. Cap rock on cliff is weathered Smoky Hill. 49.5 Top of small rise; pull onto small ramp on right. STOP 7. Cuts directly ahead are terrace gravel and sand veneered by colluvium of flanking pediment developed around badlands that comprise Stop 7. A modern bison skull has been discovered in this colluvium and can be seen in the pasture. Reboard bus and proceed eastward on K-25. 49.7-49.8 Smoky Hill Chalk Member, overlain by terrace gravel, sand, and silt, exposed in roadcut. 50.0 Crossing Smoky Hill River. Beyond bridge route ascends gradually from flood plain to low alluvial terrace. 50.5 Smoky Hill Chalk Member, overlain by terrace alluvium, exposed in roadcut on right. 50.6 City limit of Russell Springs, Kansas. 41