150 C. Schuchert — Russian Carboniferous and Permian. 



Guadalupian. 



Capitan Limestone. 



Above the Gtiadalupiaii or Capitan limestone there seemingly 

 follows an unconformity of considerable extent. Then follow 

 beds of gypsum, a white magnesian limestone, and a sandstone 

 the age of which is unknown but apparently is best referred to 

 the Triassic. 



A massive white limestone. At least 1800 feet thick. Top 



not seen. 

 From the middle of this limestone comes a fauna, nearly all 



of which is new. 



Fusulina elongata, Acanthocladia, Goniocladia, Gey- 

 erella, Orthothetina, Productus popei, P. mexicanus, 

 Spirifer mexicanus, Squamularia (?) guadalupensis, 

 Spiriferina billingsi, Hustedia meekana, Pugnax swal- 

 lowiana, Phynchonella (?) indentata, P^eptodus ( — 

 Lyttonia), Pichthofenia permiana, Myoconcha, etc. 



JDelaivare Mountain Formation. 



Essentially sandstone and limestone. Maximum thickness 

 about 2300 feet. 



At the base, in black limestone, occur: Fnteletes, Meeketta, 

 Hustedia meekana, Pugnax, Pichthofenia permiana, 

 Foordiceras, and other ammonoids. 



Higher up in the sandstone occur : Fusulina elongata, Pro- 

 ductus cf. subhorridus, Leptodus (=Lyttonia), Pichtho- 

 fenia per miana, Laevidentalium canna, etc. 



In the limestone occur : Fusulina elongata, Bryozoa of Meso- 

 zoic type, Chonetes permianus, Hustedia meekana, Phyn- 

 chonella bisidcata, Leptodus (—Lyttonia), Pichthofenia 

 permiana, and ammonites. 



Hueconian or Pennsylvania!!. 



Mainly massive limestone w T ith local shales and sandstones. 

 Maximum thickness at least 5000 feet, more, than 2000 

 feet of which are limestone. 



Near the base occur : Triticites, Productus cor a, Mar- 

 ginifera cf . wabashensis, Peticularia perplexa, Spirifer 

 rockymontanus, etc. 



Near the top occur (those marked " 1 " are Ural and " 2 " 

 Indian types ) : Fusulina, Enteletes cf. hemiplicatus, 1 

 Productus cf. inflatus, 1 P. cf. pustulatus, 1 P. cf. lon- 

 gus, 1 P. cf. irginee, Marginifera cf. wabashensis, 1, 2 

 Spirifer cf. marcoui, Seminula mexicana, 1 Camaropho- 

 ria cf. mutabilis, 1, 2 C. cf. crumena, 2 Dielasma cf. 

 truncatum, 1 Omphalotrochus obtusispira. 



