STANTON. 



MEEK AND HAYDEN'S SECTION. 

 General section of the Cretaceous rocks of JVeftrasfcrt^-Coiitinued. 



15 



Divisions and subdivisions. 





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Lead-gray calcareous marl, weather- 

 ing to a yellowish or whitish chalky 

 appearance above. Containing large 

 scales and other remains of rishes, 

 and many specimens of Ostrea con- 

 gesta attached to fragments of Ino- 

 ceramus ; also several species of Tex- 

 tularia. Passing down into light, 

 yellowish, and whitish limestone, 

 containing great numbers of Inocer- 

 aums problematicus, I. pseudomy- 

 tiloides, I. aviculoides, and Ostrea 

 congesta, fish-scales, etc. 



Dark -gray laminated clays, some- 

 times alternating near the upper 

 part with seams and layers of soft 

 gray and light-colored limestone. 

 Inoceramus problematicus, I. teuui- 

 rostratus, I. latus ? I. fragilis, Ostrea 

 congesta, Veniella Mortoni, Phola- 

 d'omya papyracea, Ammonites Mul- 

 I an anus, Prionocyclus Woolgari, 

 Mortoniceras Shoshonense, Scaphites 

 Warrenanus, S. larvaeformis, S. 

 ventricosus, S. vermiformis, Nautilus 

 elegans, etc. 



Yellowish, reddish, and occasionally 

 white sandstone, with atplaees alter- 

 nations of various colored clays and 

 beds and seams of impure lignite; 

 also silicified wood, and. great num- 

 bers of leaves of the higher types of 

 dicotyledonous trees, with casts of 

 Pharella ? Dakotensis, Trigonarca. 

 Siouxensis, Cyrena arenarea, Marga- 

 ritana Nebrascensis, etc. 



Localities. 



Bluffs along the 

 Missouri below 

 the Great Bend, 

 to the vicinity 

 of Big Sioux 

 river; also be- 

 low there on the 

 tox^s of the hills. 



Extensively devel- 

 oped near Fort 

 Benton on the 

 Upper Missouri ; 

 also along the 

 latter from 10 

 miles above 

 James river to 

 Big Sioux river; 

 and along the 

 eastern slope of 

 the Rocky moun- 

 tains, as well as 

 at the Black 

 Hills. 



Hills back of the 

 town of Dakota; 

 also extensively 

 developed in the 

 surroun ding- 

 country in Da- 

 kota county be- 

 low the mouth 

 of Big Sioux 

 river ; a n d 

 thence extend- 

 ing southward 

 into northeast- 

 ern Kansas and 

 beyond. 



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To complete the Upper Cretaceous section of this region there must 

 be added to it at the top the great coal bearing Laramie series of fresh 

 and brackish water beds, which were regarded as Tertiary at the time 

 of the earlier explorations, but are now generally assigned to the Cre- 

 taceous; and in western Wyoming the Bear River formation must be 

 interpolated. It is also a brackish- water formation, and was formerly 



