380 N. H. DARTON — STRATIGRAPHY OF THE BLACK HILLS, ETC. 



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Tensleep sandstone 397 



Chug water formation , 397 



Sundance formation 398 



Morrison formation 398 



Cloverly formation. 398 



Benton formation '. 399 



Niobrara formation 400 



Pierre shale 400 



Fox Hills sandstone 400 



Laramie formation 401 



Laramie range r 401 



General relation of the formations 401 



Cambrian 402 



Pennsylvanian 402 



Tensleep sandstone 403 



Chugwater formation 403 



Sundance formation 404 



Morrison formation 405 



Lakota-Dakota. . . 405 



The Benton group '; 405 



Niobrara formation 406 



Pierre shale 407 



Fox Hills formation 407 



Hartville uplift ..407 



General characteristics and section , 407 



Guernsey formation 408 



Hartville formation 409 



Opeche formation 410 



Minnekahta limestone 410 



Spearfish formation 410 



Sundance formation , , 410 



Morrison formation 410 



Lakota-Dakota 410 



Benton group 411 



Niobrara formation 411 



Pierre shale 411 



Rocky Mountain front range in Colorado 412 



Introductory 412 



Formations of the Front range 412 



Cambrian 413 



Ordovician 414 



Millsap limestone 415 



Red beds 415 



Sundance formation 424 



Morrison formation 424 



' ' Dakota " sandstone 428 



Benton group 430 



Graneros shale 43 1 



