GEOLOGY. 



121 



and marked divisions. The lowest appears to be Carbonate of 

 lime, with a small admixture of iron: above this is a bed less 

 pure, of a purplish hue, owing probably to a change in the con- 

 dition of the water at the time of deposition, or to the introduction 

 of vegetable matter: the third is a narrpw stratified band of 

 indurated concretion, resembling limestone, and interspersed with 

 singular amorphous cavities; and is surmounted by a bed of 

 brown loam, varying from six to eighteen inches in thickness. 

 The deposit throughout is plentifully supplied with shells of 

 various kinds, in a sub-fossilized state ; also bones, but in too 

 fragmentary a state to decide to which genus of mammalia they 

 belong, without the assistance of a Professor Owen. I picked up 

 the molar tooth of a horse among the debris lying by the side of 

 the road, but it is open to doubt whether or not it belongs to 

 the bed. A scanty supply of flint and stone occur in the lower 

 portion. 



The following is a list of shells 



To account for the phenomenon of the association of fresh 

 water, marine, and land mollusca, as well as bones, flints, and 

 stones of various formations is doubtless, difficult, and I trust 

 the following solution may neither be considered visionary nor 

 opposed to the principles of science. 



