44 



MESOZOIC FLORAS OF UNITED STATES. 



Description of the section shoimi in fig. 8. 



Feet. 



1 . Argillaceous shales , . 100 



2. Calcareous shales 100 



3. Argillaceous shales 200 



4. Sandstones 100 



5. Argillaceous shales 200 



Total thickness of Moencopie formation 700 



6. Lithodendron member 800 



7. Variegated marls 400 



8. Sandstones 100 



9. Limestone ledge 20 



10. Mortar beds 80 



11 . Calcareous marls 200 



Total thickness of the Shinarurap formation. 1 , 600 



12. Orange-red sandstone 100 



13. Variegated sandstones 800 



14. Brown sandstones 200 



15. White sandstones 100 



Total thickness of Painted Desert formation 1 , 200 



Total thickness 3, 500 



In order that the geographical relations of the area included in the 

 above discussion may be seen as clearly as possible, I present a sketch 



Fig. 7.— Section ol Red Butte (see p. 43). 



map (PI. IV, in Part II) covering the territory in question and extending 

 a little beyond the extreme limits of all the sections. Although originally 

 formed by putting together the several sheets of the topographic 

 map used in the work, the topography does not appear in the map, but 



