238 F. V. Hayden on the Geology of the Country 
VI. Cretracrous Rocks wira Suppivistons.* 
The various subdivisions of the Cretaceous group in the West 
were observed at numerous localities. The strata in many places 
occupy large geographical areas, holding a horizontal position, 
in others forming a belt or zone of greater or less width around 
‘the mountain elevations. No.1 is a well marked and distinct 
its existence, but no well marked typical beds were seen. 
into No. 2, so that No. 3 in the west and southwest may give 
place to an increased development of No. 2. Nos. 4 and 5 are 
. . fr tic 
slope, six to eight hundred feet of alternations of black plaste 
clays, arenaceous marls and beds of sandstones and limestone with 
a few seams of Carbonaceous matter passing up into calcareous 
and arenaceous compact rocks. In 
near the middle of the series and extending upward, quite er 
ca near ay rogks of the West have been divided into five form 
numbered 1, 2, 3, &c. A more careful st . render it neces 
rh Tae study of No. 1? may render it nete 
