APPENDIX. 



575 



Section in Arizona. 1 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 



Centura formation. 



1800 + 



Red nodular shales with cross-bedded, buff, 

 tawny, and red sandstones; beds of impure 

 limestone near base. 



o.22 



cpq 



Mural limestone. 

 Morita formation. 



650 



1800- 

 2000 + 



Thick-bedded, hard, and fossiliferous above, 



and thin-bedded, arenaceous, and fossiliferous 



below. 

 Buff, tawny, and red sandstones, and dark-red 



shales, with occasional thin beds of impure 



limestone near the top. 



Glance formation. 



— -~~~ Unconformity -^ — ~ 



Ti § Naco limestone, with 

 c - 5 \ intruded granite 

 § g [ porphyry. 



25-500 



3000 + 



Bedded conglomerate; pebbles angular and 

 chiefly of schist and limestone. 



Chiefly light-gray, compact limestone, in beds 

 of moderate thickness; fossils abundant. 



" '2L, 1 Escabrosa limestone. 



700 



Thick-bedded white, and light-gray limestone, 

 with abundant crinoid stems. 



£ a \ Martin limestone. 



Unconformity 



g | I Abrigo limestone. 

 ^'E | Bolsa quartzite. 



340 



770 

 430 





Unconformity 



Pinal schist. 



Dark-gray, fossiliferous. 



Thin-bedded, impure, cherty. 

 Cross-bedded, with basal conglomerate. 



Sericitic schists. 



1 Ransome, Bisbee, Ariz., folio, U. S. Geol. Surv. 



