

walcott.] NOMENCLATURE. 251 



withstanding the fact that the rock itself is a magnesian limestone, 

 with more or less siliceous and sandy beds alternating with the lime- 

 stone. 



In the second annual report of Vermont by Dr. Adams, in the descrip- 

 tion of a section of Snake Mountain, Addison County, the strata cap- 

 ping the mountains are designated by the name of Red Sandrock. 1 



PRIMAL. 



The term Primal was proposed by the brothers Kogers in 1844 and 

 defined as follows : 



Onr Primal series embraces the four great rocks between the base of the Paleozoic 

 .strata and the base of the first limestone, the Calciferons sandstone of New York. 2 



The equivalent expression was Formation No. 1, and both terms have 

 been used in the geologic work of Pennsylvania, Maryland, and Vir- 

 ginia, but they have not come into general use. 



CHILHOWEE. 



The name Chilhowee was proposed by Prof. J. M. Safford in 1856 for 

 a series of sandstones and shales superjacent to the Ocoee conglom- 

 erates and shales and subjacent to the Magnesian limestone and Shale 

 group, or what was subsequently called the Knox shale and the Knox 

 limestone. 3 



By the discovery of the Olenellus fauna in the shale resting upon the 

 quartzite of Chilhowee Mountain, the Chilhowee Mountain quartzite is 

 referred to the Lower Cambrian and correlated with the Granular 

 quartzite upon the western slope of the Green Mountains of Vermont. 



WEISNER. 



This name is proposed by Prof. Eugene A. Smith for the lenticular 

 masses of quartzite that occur in the Montevallo shale of northeastern 

 Alabama. He correlates the quartzite with the Chilhowee Mountain 

 quartzite of Tennessee. This correlation is probably incorrect, as the 

 latter quartzite is of Lower Cambrian age. 4 



This name is also used by Mr. C. Willard Hayes for a series of quartz- 

 ites that occur between the Coosa shales and the Connasauga shales 

 of the Cambrian section of northwestern Georgia. In connection with 

 the Rome sandstone he mentions the correlation of it with the Knox 

 sandstone, Potsdam or Chilhowee, Prof. Safford's Tennessee section, 

 by Profs. Smith and Safford. 5 



1 Second Ann. Rep. of Geol. Snrv. of Vermont, 1846, p. 163. 



2 On American geology and present condition of geological research in the United States. Am. Jour. 

 Sci., vol. 47, 1844, p. 155. 



s A geological reconnaissance of Tennessee ; first biennial report. Nashville, 1856, p. 152. 



♦Geological structure and description of the valley region adjacent to the Cahaba Coal Field. Geol. 

 Surv. Alabama. Kept, on the Cahaba Coal Field. Pt. II, 1890, p. 149. 



6 The overthrust faults of the southern Appalachians. Bull. Geol, Soc. America, vol. 2, Feb., 1891, 

 p. 143. 



