lowing is 

 of theBli 



40 feet slope, apparently 

 of gray and yellowi 

 8 feet limestone, compai 

 full of fossils. 



15 feet slope. 



10 feet alternations of su 



30 feet bluish-gray argi 

 calcareo-argillaceou: 



15 feet alternations of v 



shales. Higher up on the hills moiv argillaceous sl,al,-s were not 

 On the ridge, between the Big Blue and Cottonwood Cree 

 change had been observed in the tbrmatioii. There, in a drai 

 exposed of light-yellowish chalky or arenaceous magnesian limes 

 containing Brljcmphon and a tew other fossils, interstratitied wi 

 ceous shales. They are capped by light-colored arenaceous sh, 

 concretions, changing into yellow or brown suit sandstones, wi 

 highly ferruginous portions. While the lower strata form the continuation of the series, 

 which is developed on the Big Blue and Cottonwood Creek, the upper strata belong to 



dark-' 



THE CRETACEOUS (OR, F 



■ERHAPS, JUKJ 



Neither in these nor in sini 



ilar strata fai 



their exact position can, therefore, 



not be deter: 



character alone, I should conside 



r them as be 



stones of the Cretaceous formath 



>n, the No. 1 



section, which I found farther wt 



38t; but othe 



of that section, which have been 



considered b; 



which may, however, turn out to 



. be likewise ' 



Marly Clay group of Dr. B. F. Shumard, which underlies the sandstone No. I in 

 Texas. (Transactions of the Academy of Science of Saint Louis, vol. I, No. 4, 1860). 

 I did not notice any beds of gypsum or lignite, which have been found in similar 

 formations farther south; but it must be borne in mind that, as I have stated above, 

 these strata thin out altogether toward the north, and near our route are already much 

 less developed than farther south, where the other gentlemen have examined them; 

 besides, that such formations are generally much subject to local changes. 



