412 Rev. R. Henna h on the Limestone of Plymouth. 



interruption in the natural position of the strata. The rock consists 

 not of limestone but of a hard ironstone, which is used for paving. 

 There is a sudden cleft or fissure which divides it from top to bot- 

 tom, and the strata, instead of preserving their usual inclination 

 from north to south, meet the eye in all directions, horizontal, 

 perpendicular, and inclining one after the other, until they describe 

 the radii of a large circle. 



It may be worth mentioning, that from the western point of the 

 hill called the Hoe, to the eastern, and at other places near it, I have 

 remarked on the side of the cliff, about fifteen or eighteen feet 

 above highwater mark, a stratum two or three feet in thickness, 

 composed of sand and waterworn pebbles cemented together, and 

 appearing to have been at some remote period the original beach. 



