MOOE, STUDY OF THE MORRISON FORMATION 



97 



Feet 



10. Reddish and brown shales and clays 49 



11. Dark fossiliferous limestone with Camptonectes and Ostrea.... 2 



12. Greenish shales with dark bands of clay and sandstone, with 



clay containing concretions of limestone rich in fossils. Fos- 

 sils present : Belemnites, Pentacrinus, Astarta, Grammato- 

 don, Ostr^ea, Pseudom-onotis, Pleuromia, Pinna, Lima, Megal- 

 neusaurus, Baptanodon and Plesiosaurus 50 



13. Gray sandstone 4 



14. Red and brown shales with concretions and a few fossils 44 



15. White sandstone with upper band containing fossils 30 



Total marine beds [Shirley or Sundance] 179 



Pig. .59. — Section of the Morrison forma- 

 tion at Red Mountain, Wyoming. 

 Scale, 125 feet to 1 inch. (Knight.) 



Fig. 60. — Section of the Morrison forma- 

 tion at Red Mountain, Wyoming. 



1. — Morrison formation ; 2. — Sundance 

 formation. Scale, 125 feet to 1 Inch. 



(Darton.) 



Red Mountain Section 



Cretaceous : Dakota removed but present in most instances. 

 Jurassic : 



1. Drab marls and clay with two thin bands of limestone and one 



of chert and chalcedony with Dinosaur remains 35 



2. Drab limestone 2 



3. Variegated marls with Dinosaur remains 38 



4. Gray limestone 1 



5. Drab marls and clays 39 



6. Gray sandstone 6 



7. Drab marls and clays 69 



8. Gray sandstone and some conglomerate 20 



9. Drab and red marls and clays 25 



Total, all fresh-water beds 235 



