64 Geological Prodromus. 



I intend to demonstrate, by references to localities of easy access, 

 that, 



All geologial strata are arranged in five analagous se- 

 ries ; AND THAT EACH SERIES CONSISTS OF THREE FORMATIONS : 



viz. THE Carboniferous, Quartzose, and Calcareous. 



APPLICATIONS. 



FIRST SERIES. 



1st. Carhoniferous formation. — Primitive slate rocks, as gneiss, 

 mica-slate, &tc. contain plumbago ; often in large quantities ; as in 

 Sturbridge, Mass. ; on Lake Champlain, Sic. 



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

 of Massachusetts. 



3d. Calcareous formation. — Granular limerock ; as in the west 

 part of Massachusetts. 



second series. 



1st. Carhoniferous formation. — Ai'gillite contains anthracite, pas- 

 sing into plumbago ; as in Worcester, Mass., Providence and New- 

 port, Rhode Island ; Troy, New York. 



2nd. (Quartzose formation. — First graywacke, including the rub- 

 blestone or conglomerate; as in Rensselaer county; Shawingunk 

 Mt. in New York, &c. 



3d. Calcareous formation. — Sparry limerock, calciferous sand- 

 rock, and metalliferous limerock ; as in Rensselaer, Albany, Colum- 

 bia, Herkimer, and Oneida counties ; near the base of Catskill 

 Mountain, &;c. This underlies the slate containing the Lehigh, or 

 Lackawannock coal in Pennsylvania. It is called the lower carbon- 

 iferous limerock by Conybeare, Bakewell, and otliers. 



THIRD series. 



1st. Carhoniferous formation. Calciferous argillaceous slate; 



being the lower division of second graywacke. It embraces the Le- 

 high, or Lackawannock, coal range in Pennsylvania, and underlies 

 the conglomerate or millstone grit near Utica, is at the basis of Cats- 

 kill Mountain, &ic. — Note. Bakewell quotes Farcy's name, lime- 

 stone shale, for this rock, because it always reposes on limestone. — 

 Note 2. Second graywacke contains tropical vegetable petrifactions, 

 which entitle it to a place in tlie secondary class ; a fact not known 

 to me until this summer, (1829.)* 



* In the lower secondary strata, the organic remains belong almost exclusively to 

 the vegetable kingdom, and are analogous to the native plants of warm tropical cli- 

 mates. See Silliraan's Bakewell, p. 109. 



