WALCorr.] NOMENCLATURE. 247 



This name seems to be a synonym of Montevallo shales proposed by 

 Prof Eugene A. Smith. 



MONTEVALLO. 



The name Montevallo, or Choccolocco, shales was proposed by Prof. 

 En gene Smith, for a series of sandy shales of a great variety of colors. 

 Biicb as olive, green, brown, chocolate, yellowish, etc., that occur above 

 the Coosa shales in northeastern Alabama. 1 



This name appears to be equivalent to Connasauga shales proposal 

 by Mr. C. Willard Hayes. 



CHOCCOLOCCO, 



This is apparently a synonym of Montevallo. 



COOSA. 



The name Coosa shales was proposed by Prof. Eugene A. Smith for 

 the shales in the Coosa Valley at the base of the Cambrian section. 

 They are described as thin-bedded limestones with clay seams be- 

 tween. 2 



This name is also used by Mr. C. Willard Hayes in a paper read be- 

 fore the Geological Society of America, December 29, 1890, and pub- 

 lished February 9, 1891. It was applied to the series of shales, some 

 3,000 feet in thickness, occurring at the base of the Cambrian section 

 in northwestern Georgia. 3 



ROME SANDSTONE. 



This name was proposed by Mr. C. Willard ITayes for a sandstone of 

 Cambrian age occurring at Rome, Georgia. In connection with the 

 Weisner quartzite it is given a thickness of from 2,000 to 3,500 feet. 

 The correlation is with the Knox sandstones of Tennessee. 4 



BRETONTAN. 



This name is applied by Mr. G. F. Matthew to the upper series of 

 Cambrian rocks as found in the vicinity of St. Johu, New Brunswick, 

 and on the island of Cape Breton, where the fauna of the division is 

 well developed. It will be arranged as an Upper Cambrian forma- 

 tion. 5 



1 Geological structure and description of the valley region adjacent to the Cahaha Coal Field. Geol. 

 Surv. Alabama. Report on the Cahaha Coal Field, pt. n, 1£90, p. 148. (Issued January, 1091 ) 



1 Ibid., p. 148. 



"The overthrust faults of the Southern Appalaciana. Bull. Geol. Soc. America, vol. 2, Feb., 1891, 

 p. 143, pi. 3. 



• Ibid., p, 143. 



•Ulustratione of the fauna of the St. John group, No. 5. Trans. Roy. Soc. of Canada, vol. 8, 1890, 

 p. 129. 



