256 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



cephalus from the Eminence formation of the Ozark section of 

 Missouri. It is evident from the hsts of fossils given by Weller * 

 that they belong to more than one faunal horizon. This makes the 

 evidence for correlating the " Saratogan " fauna of New York with 

 that of New Jersey of little value. 



Dr. E. O. Ulrich ^ has correlated the Eminence formation of Mis- 

 souri with that of the Potsdam sandstone and Hoyt limestone of New 

 York ; but with the present faunal evidence I think that we should 

 hesitate to accept the correlation as established. The Dicello cephalus 

 of the Eminence formation is a later type and the Agraulos has little 

 weight because the cranidia of that genus have a close resemblance 

 in specific characters from the Lower Cambrian to basal post-Cam- 

 brian strata. 



I greatly appreciate the work Dr. Ulrich has done in endeavoring 

 to establish an upper limit to the Cambrian system, and regret that I 

 cannot 3'et fully agree with him that the " Saratogan " of New York 

 should be classed as post-Cambrian. 



USE OF THE TERMS SARATOGAN AND ST. CROIXAN 



When I proposed the name " Saratogian " in 1903 ^ for the Upper 

 Cambrian group of formations, an examination of several lists of 

 geological formation names failed to show that the name Saratoga 

 had been used by Dr. J. C. Branner * for a Cretaceous chalk marl in 

 Arkansas, in his description of " The Cement Materials of Southwest 

 Arkansas." ° A description of the formation is given, with sections 

 illustrating its stratigraphic position. In 1902 Mr. J. A. Taff used 

 the name Saratoga formation in the same sense as Branner and gave 

 illustrations of sections and contained fossils." 



In view of the prior use of the name Saratoga by Branner and 

 Taff, I doubt the advisability of continuing the use of Saratogan as 

 a group name for the Cambrian formations. There is also the fact 

 that the two formations of Saratoga County, New York, that are 

 used as the basis for the name, are not typically of Upper Cambrian 

 age. A present tendency is to include them as passage beds between 



^ Geol. Surv. New Jersey, Rept. on Pal., Vol. 3, 1903, pp. 12 and 13. 

 *Bull. Geol. Soc. America, Vol. 22, No. 3, 1911, pi. 27. 



* Journ. Geol., Chicago, Vol. 11, 1903, pp. 318-319. 



* Dr. John M. Clarke recently (May 27, 1912), called my attention to the 

 use of the name Saratoga by Branner, and wrote that he was then discussing 

 the history of the name in a paper in press. 



"Trans. American Inst. Mining Engineers, Vol. 27, 1898, pp. 52-55. 



* Twenty-second Ann. Rept. U. S. Geol. Survey, 1902, pp. 714-720. 



