19.2 Jetmore Chalk Member exposed in small roadcut. 20.8 Crossroad. Turn right (north) on Bunker Hill-Luray Road. 21.5 Entering Bunker Hill, Kansas. 22.1 Grade crossing at Union Pacific Railway line. 23.2 Lower part of Fairport exposed in roadside ditch on right. (Inoceramus cuvieri, C. woollgari, burrows, Ostrea; "pink lime" exposed here). 23.3 Lower part of Fairport exposed in roadside ditches. Loessial soil lies above Fairport. 23.9-24.1 Upper part of Pfeifer and lower part of Fairport exposed in long roadcut. Fencepost limestone bed conspicuous in middle of section. 24.2 Upper two-thirds of Hartland and lower part of Pfeifer exposed on right in cut- bank of intermittent stream. Roadcut ahead is in upper part of Pfeifer and lower part of Fairport. 24.6 Note use of stone posts in fences on both sides of road. 24.9-25.4 STOP 2. 25.9 Reboard bus at top of hill. Return to U.S. Highway 40. 30.0 Junction with U.S. Highway 40. Turn right (west) onto U.S. 40. 30.9 Upper part of Jetmore in low roadcut. 37.6 East city limit of Russell (originally called Fossil Station). 37.8 Historical marker commemorating construction of the Union Pacific railroad in 1867 and an Indian ambush in 1869 during which two of seven railroad sec- tion hands were killed and four others were wounded. 38.6 Junction of U.S. 281 (Fossil Avenue) and U.S. 40. Continue westward on U.S. 40. 38.9 Crossroad at Lincoln Street. Turn right onto Lincoln Street. 39.1 Entrance to city park. Turn left into park. Lunch stop. 39.4 Park entrance, turn right (south) and return to U.S. Highway 40. 39.6 Junction Lincoln Street and U.S. 40. Turn right (west) onto U.S. 40. Oil field on both sides of highway is part of Russell oil field, producing from rocks of the Arbuckle Group (Cambrian-Ordovician) and the Kansas City and Lansing Groups (Pennsylvanian) on the Central Kansas Uplift. For next several miles route crosses loess-veneered Cretaceous rocks. 47.6 Gorham oil field on left. Extensive deeper drilling in early 1960's resulted in renewed production in this part of field. 48.1 Entering Gorham, Kansas. 49.2 Entering Ellis County. 51.1 Entering Walker, Kansas. 51.2 Turn right (north) on county road. (If roads are wet, alternate route will be followed west to Victoria, thence north to Saline River valley, thence southeast to Stop 3 via Saline Valley Road.) For next several miles route crosses loess- covered Carlile Shale. 53.5 Crossroad. Hills on horizon to north are capped by Fort Hays Limestone Member of Niobrara Chalk. 57.5 "T" intersection. Turn left (west). 58.5 Crossroad. Turn right (north). 31