LIME AInTD cement INDUSTRIES 789 



Ferric oxid 21 .84: 



Lime carbonate 89.15 84 . 6 



Magnesium carbonate tr. 3 . 42 



99.09 100.03 



From Tngliam Mills the Trenton limestone passes northwest- 

 ward past Salisbury and E'orway to tlie edge of the county, where 

 it forms a belt whose width extends from Poland to Grant. A 

 spur also extends from Poland southeast to Middleville, and it 

 is quarried at E^ewport by G. S. Higgins, J. Dunn, 'N. Morej, 

 W. W. Mosher, G. H. O'Connor, 0. Smith, and D. Tuomey. 



JefTerson county ^ 



Probably one half the county is underlain by limestones, mostly 

 of Trenton age, while additional small areas of pre-Cambrian age 

 •are known to occur. The Trenton limestone occupies a more 

 or less triangular area, the towns of Clayton, Carthage, and 

 Mannsville being approximately in the corners. The area is 

 traversed by the several branches of the Rome, Watertown and 

 Ogdensburg railroad. 



The Calciferous sandrock, though known to occur in Jefferson 

 county, is usually covered by the Birdseye. According to Em- 

 mons^ the Calciferous is exposed 4 miles south of Theresa falls 

 on the Watertown road, also IJ miles east of French creek and 

 near Depauville. 



The Birdseye extends across the county from east to west, hav- 

 ing a breadth of about 10 miles. Its northern edge passes through 

 Depauville, and a point 2 miles south of Evans Mills on Indian 

 river, thence to the great bend on Black river, and then to a point 

 2 miles southwest of Carthage. The Birdseye is thick bedded, 

 and compact -and usually of considerable purity. The total thick- 

 ness of this member is not over 40 feet in Jefferson county. 



1 Emmons, Ebenezer. Geol. 2d dist. N. Y. 1842. p. 368. 



2 Geol. 2d dist. N. Y. 1842. p. 380. 



