310 G. D. Walcott — The Taconic System of Emmons. 



position was determined by its relation" to the crystalline rocks 

 beneath and the superjacent strata, as no fossils were known 

 by him from the formation. A talcose conglomerate that is 

 treated as a subordinate member of the " Granular Quartz se- 

 ries" is described as occurring between the quartzite and 

 Primary, in several localities. 



^ / 



Pig. 10. — A tabular view of the strata as arranged by Dr. .Emmons. 



The figures placed at the sides are equivalent to those used on the section on 

 the side of the map. The dotted lines on the right side show the relation of the 

 " Upper Taconic " to its geologic equivalent the " G-ranular Quartz." 



Conformably resting on the " Granular Quartz," on the 

 north side of Graylock Peak, at the Hopper, he found a bed 

 of "talcose slate," 400 to 500 feet thick, which is represented 

 in the table (tig. 10) by number 2. It appears to be the ex- 

 tension of a formation of more than 2,000 feet in thickness 

 that occurs on the western side of the Taconic range. (See sec- 

 tion on the map.) 



Stocklridge limestone (Terr. No. 3 of Section and fig. 10). — 

 Upon the slates of Terrane No. 2 a series of limestones and 

 marbles are conformably superimposed that are called by Dr. 

 Emmons the " Stockbridge limestone." This includes all the 

 limestones, " good and bad, in connection with the bed known 

 as marble." A good description of this terrane is given in the 

 memoir of 1844-'47, and again in 1856. It is assigned a thick- 

 ness of 500 feet, in Saddle Mountain, Mass. 



