MOOK, STUDY OF THE 3I0RRIS0N FORMATION 



95 



^•23. Drab-colored clay 70 ft. 



"Species of the genera Brontosaurus, Dip- 

 lodocus, Morosaurus, Stegosaurus and Allo- 

 saurus occur in this horizon. Portions of 

 species of all these genera were found in one 

 quarry by the Kansas University collecting 

 party. The clay is of that quality usually 

 designated as 'joint' clay. It contains in 

 places iron and argillaceous concretions of 

 small size. The iron, and sometimes the 

 bones, are covered with selenite crystals. 



■"24. Grayish-white sandstone 50 ft. 



"This layer forms a conspicuous capping 

 for the hills, and is the highest remnant of 

 the anticline. It breaks up into large blocks, 

 which lie scattered along the slopes of the 

 underlying softer beds. Its erosion and dis- 

 integration is accomplished chiefly by sap- 

 ping. No fossils were found in this stratum, 

 and its true position is in doubt." 



Fig. 56. — Section of the Morri- 

 son formation in the Freezeout 

 Hills, Wyoming. 



1. — Cleverly foi'mation ; 2. — 

 Morrison formation. Scale, 125 

 feet to 1 inch. (Logan.) 



The following sections are given by W. C. Knight (1900, 2) : 



Sioux Fault Section 

 •Cretaceous : 



Dakota conglomerate and sandstone. 



Jurassic : Feet 



1. Variegated marls and clays shading from dark yellow to dark 



maroon, with dinosaurian remains 38^ 



2. Calcareous sandstone 2 



3. Bluish and yellowish marls, containing Brontosaurus at top and 



Morosaurus at base 22^^ 



4. Drab calcareous sandstone 1^^ 



5. Light colored clays and marls, with thin bands of sandstone... 24 



6. Clays and marls varying from light gray to brown 23^ 



7. Hard band of light gray clay 4^^ 



8. Drab and greenish clays 22^^ 



9. Drab sandstone 2 



10. Yellow, greenish and light brown marls shading into maroon in 



the upper portion 38^ 



11. Gray sandstones 3 



12. Bluish gray clay 4 



13. Bluish and drab chiys interstratified with yellowish bands 381^ 



Total thickness of fresh- water beds [Morrison] 226 



14. Variegated clays and marls with bands of sandstone 43^4 



1.5. Yellowish sandstone 8^4 



