R. S. Lull — Mammals and Horned Dinosaurs. 337 



Lance formation, all dipping northward 14° to 19°. No attempt 

 was made to obtain a detailed section of the Lance formation, 

 but a measurement across the strike as far as the strata have 

 steep dips shows a thickness of about 1700 feet above the upper 

 white sandstone, which was later determined to be the top of the 

 Fox Hills. To this should be added perhaps 400 or 500 feet for 

 the thickness of the nearly horizontal upper strata of the Lance 

 formation. The lowest point at which dinosaur bones were seen 

 is about 300 feet above the top of the Fox Hills." 



The section follows : 



FEET 



Gray sandstone 10 



Shale.. 25 



Sandstone and shale 20 



Shale and coal 15 



Shale with brackish-water fauna.. 20 



Top of Fox Hills. 



Massive white sandstone with brown concretions 40 



Sbaly sandstone 5 



Coal and carbonaceous shale 15 



Massive white sandstone _ 60 



Shale . 8 



Sandstone 10 



Shale 5 



Massive white sandstone .. 100 



Brownish gray sandstone in alternations of massive and 



more thinly bedded 130 



Gray sandstone 30 



Brown sandstone 20 



Yellowish sandstone with Fox Hills fauna 30 



Pierre shale 



Of the other section (b) in the southern end Stanton (1910, 

 p. 186) speaks thus : 



"The last section examined and perhaps the best exposed and 

 most instructive of all is on Johnson Brothers' ranch, near Buck 

 Creek, about 8 miles east of the section just described." 



This section follows : 



FEET 



Sandy shale with thin beds of coal. 25 



Top of Fox Hills. 



Massive white sandstone with Halymenites major 60 



Yellowish massive sandstone with brown concretions 20 



More thinly bedded brown sandstone with Saly menites.. 25 



M assive white sandstone — 75 



Soft somewhat sandy shales with thin sandstone bands 



containing marine Fox Hills shells 30 



Brown shaly sandstone — 5 



Massive white sandstone 60 



