BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 24, pp. 351-376 June 27, 1913 



proceedings of the paleontological society 



ALEXANDEIAN SEEIES IN MISSOUKI AND ILLINOIS 1 



BY T. E. SAVAGE 



{Presented by title before the Paleontological Society December 31, 



1912) 



CONTENTS 



Page 



Introduction 351 



Distribution of strata 353 



Earlier studies and interpretation of the strata 353 



General stratigraphic relations 356 



Detailed stratigraphy of the Alexandrian series 357 



Thickness and formations of the series 357 



The Girardeau limestone 357 



Occurrence and stratigraphic relations 357 



Detailed section 358 



Fossils from the Girardeau limestone in Illinois and Missouri. . . . 358 



The Edgewood limestone 359 



Occurrence and stratigraphic relations 359 



Detailed sections 361 



Comparative table of fossils from the Edgewood limestone 365 



The Channahon limestone member 367 



Comparative table of fossils 368 



The Essex limestone 369 



Occurrence and relation to other strata 369 



Detailed section 36» 



Fossils from the Essex limestone 369 



The Sexton Creek (Brassfield) limestone 370 



Occurrence and relation to other strata 370 



Detailed sections 371 



Fossils from the Sexton Creek limestone 372 



General conclusions 373 



Generalized section of the Alexandrian strata in Missouri and Illinois 375 



Introduction 

 The name Alexandrian series 2 was proposed by the writer in 190S ir 



1 Manuscript received by the Secretary of the Geological Society May 0. 1918, 

 3 T. E. Savage : Am. Jour. Sci., vol. xxv, 1908, p. 434. 



(361) 



