286 ON THE GEOLOGY AND 



or lamellar carbonate of lime, similar to what we ob- 

 serve in many of the transition and older secondary 

 limestone, where cavities are observed exhibiting 

 the external impression of marine organic bodies, 

 filled with the same kind of crystalline carbonate of 

 lime ; it may, also, be necessary to add, that similar 

 appearances are never presented by primitive lime- 

 stone ; it is not at all improbable that the occurrence 

 of lamellar carbonate of lime, in the manner just men- 

 tioned, may have induced a belief that it contained 

 fossil shells. The limestone found at Franklin upon 

 the grauwacke, appears to be contemporaneous with 

 that of the valley, north of Schooley's mountain, also 

 with that of Easton and north of Reading in Penn- 

 sylvania, and in fact with all the limestone occurring 

 east of our great chain of mountains : excepting al- 

 ways, however, our primitive limestone, and that 

 which accompanies the old red sand stone formation; 

 with it is likewise found, the same blue flint or 

 siliceous slate and occasionally hyaline quartz in 

 crystals. 



In order that the geology of the country which we 

 have attempted to describe, may be so intelligible as 

 to be understood by those who are not even couversant 

 with the subject, we have thought proper to annex 

 the two following diagrams, (vide plate) the first 

 showing the geographical or superficial disposition 

 of the rocks we have described, and the second one, 

 their geological position or arrangement ; this latter 

 section is the result of our observations made on the 

 road, which lies on the north side of the mill-pond at 



