82 PROCEEDINGS or THE SAIXT LOUIS MEETING 



CLINTON FORMATIONS IN THE ANTIC08TI SECTION 

 BY E. O. ULRICH 



(Ahstract) 



Among the stratigraphic results of a monographic study of the Silurian 

 Ostracoda is reasonably definite proof that the Gun River and Jupiter River 

 formations of the x\nticosti section are of Lower Clinton age. The upper part 

 of the Gun River formation is shown to correspond to the Williamson shale in 

 New York and to the basal 100 feet or so of the Clinton at Cumberland, Mary- 

 land, and at places in Pennsylvania. The same ostracod fauna is clearly recog- 

 nized also in southwestern Virginia. 



The Jupiter River ostracod fauna also is clearly indicated in the Clinton 

 sections in New York and Maryland. Its zone in these States lies from 60 to 

 150 feet above that of the Gun River species, the variations in the thickness of 

 the interval between them being dependent on the relative local completeness 

 of the sequence of Clinton deposition and probably on local variations in rate 

 of deposition and character of deposits. 



Both of these faunal zones underlie the zone of Mastigoholba lata {Beyrichia 

 lata — part. Hall), which lies near the middle of the Lower Clinton (Kirkland 

 formation) in Pennsylvania and Maryland. 



Eead in full from manuscript. 



Questions were asked and remarks made by Drs. I. C, White and John 

 M. Clarke and the author. 



The Society adjourned at about 6 p. m, 



PIJESIDEXTIAL ADDRESS 



At 8 o'clock p, m,, at the Planters' Hotel, Prof, Frank D. Adams de- 

 livered his address as retiring President, his topic heing 



EXPERIMENT IN GEOLOGY 



Published as pages 167-186 of this volume. 



COMPLIMEXTARY SMOKER 



The address was followed by the complimentary smoker given by an 

 association of citizens of Saint Louis in honor of the Geological Society 

 of America and its friends. 



