MOOK, STUDY OF THE MORRISON FORMATION 



125 



Hard, quartzitic sandstones, with clay pebbles, often occur. 



Conglomerates occur occasionall}', but are not especially abundant and 

 are never very coarse. 



G3^psmn is fairly abundant in the formation, but not in the form of 

 distinct beds. 



Fig. 90. — Fussiliferous litnestone, from the Morrison formation near Canon City, 



Colorado. 



About 28 X. 



The coarse sandstones are often resistant and stand out in cliffs (Fig. 

 33). In some cases where they are very calcareous, the coarser beds are 

 friable and crumble easily. The finer materials are usually easily eroded, 

 but are sometimes resistant to the hammer. 



