66 > Geological ProdromuL 



series are always analogous to the general series, excepting that they 

 do not embrace carboniferous minerals. 



Example 1st. The third series embraces a subordinate series, about 

 two hundred and forty miles long, and twenty miles wide ; which 

 runs along the south side of Lake Ontario, commencing near Little 

 Falls. It is interposed between the divisions of the quartzose forma- 

 tions of the series ; to wit, the saliferous rock and shell grit. 



1. Carboniferous formation. Ferriferous slate. 



2. Quartzose formation. Ferriferous sandrock, 



3. Calcareous formation. Lias, embracing the gypsum. 

 Example 2nd. The first series embraces a subordinate series near 



the west line of Massachusetts. It is interposed between the calca- 

 reous formation of the first, and the carboniferous formation of the 

 second, series. 



1. Carboniferous formation. — Gneiss, and talcose slate ; as aU the 

 eastern part of Saddle Mountain near Williams College. 



2. (Quartzose formation. — Granular quartz ; as the west part of 

 Saddle Mountain, &c. 



3. Calcareous formation. — Granular limerock ; as aU the valley 

 near the west line of Massachusetts. 



CARBONIFEROUS ASSOCIATES. 



Ores of iron and manganese are generally associated with the car- 

 boniferous formations. 



First Series, 



Protoxide of iron, and peroxide of manganese are found in and 

 near the Green Mountain and Champlain range. Hema^itic iron 

 ore, and peroxide of manganese are found in the subordinates of the 

 first series ; as in Salisbury, Con. and Bennington, Vt. 



Second Series. 



Hematitic iron ore of the Elba variety, and argillaceous manganese, 

 are found in carboniferous slate of this series, in Rensselaer and Co- 

 lumbia counties, New York. 



Third Series. 



Lenticular iron ore is found in the subordinates of this series, and 

 argillaceous manganese in the carboniferous slate ; as the iron in all 

 the subordinate range, and the manganese in Blenheim, New York. 



Fourth Series. 

 Reniform argillaceous iron ore is found accompanying all the Tioga 

 or Lycoming coal ; and small quantities of argillaceous manganese. 



