382 W. C. KNIGHT — JURASSIC ROCKS OF SOUTHEASTERN WYOMING 



Feel 



'.'>. Hard clay and .sand containing freshwater mollusks and crocodiles. H 



4. Drab marls and clays \\itli a few hands of calcareous sandstone 



with remains of Alosaurus, Diplodicus, Brontosaurus, Morosaurns, 



and Stegosauros, Ceratodus and Turtles 24? 



5. Drab marls and clays with thin beds of soft sandstone 46 



i). Yellowish soft sandstone with cycads and petrified wood 10 



7. Brown sandstone, cross-bedded 2 



8. Drab shales, clays, and marls 70 



9. Greenish sandstone 4 



Total Freshwater beds 211 



10. Reddish and brown shales and clays 40 



1 1. Dark fossil iferons 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. Fossils pres- 

 ent: Belemnites, Pentaerinus, Astarta, Grammatodon, Ostrea, 

 Pseudomonotis, Pleuromia, Pinna, Lima, Megalneusaurus, Bap- 

 tanodon, and Plesiosaurns 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 1 79 



Triassic: Red sandstone. 



Red Mountain Section 



Cretaceous: 



Dakota removed but present in most instances. 



Jurassic: 



feet 



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 



."). Drab marls and clays 3D 



0. Gray sandstone 



7. Drab marls and clays 00 



5. Gray sandstone and some conglomerate 20 



0. Drab and red marls and clays 25 



Total, all freshwater deposits 235 



Sandstones are usually calcareous. Thin-section rests on the Triassic red sand- 

 stone. 



Correlation of the Sections 



The upper portions of the Sioux fault and Freezeout sections bear a 

 marked resemblance to the entire Red Mountain section. So far as known. 



