Dr. Be'RCER on tbe Isle of Man. 45 



ff Amygdaloid. 



Kaal-Farane and Cromwell' walk, two places that separate Scarlet 

 point from the entrance of Pool-vash bay, present an unstratiiled 

 bed of amygdaloid that overlies the limestone itself. 



The basis of the amygdaloid is a wacke of an earthy texture, dull 

 and of a greenish-grey colour, emitting a strong argillaceous smell 

 when breathed upon. There are in the powder a few particles that 

 effervesce with acids ; the rock however fuses readily into a dark 

 olive bead that is attracted by the magnet. There are in the basis 

 nodules of lamellar calcareous spar, lined on their periphery with 

 iron pyrites : the cavities they are imbedded in are smooth. When 

 by the action of external agents the more tender nodules have been 

 washed away, the rock partakes of the appearance of a slag, inas- 

 much as the basis is itself of a dirty red brown colour. The mean 

 specific gravity from three specimens is 2.592. 



"fff Sandstone, 



It occurs both under the form of fine granular and of conglo- 

 merate, of a red and grey-white colour, a little to the north of Peel 

 town on the shore, and also on Langness isthmus. In the first place 

 the strata run south-west and north-east, dipping north-west at ^^\ 

 At Langness, as we approach towards the south point of the isthmus, 

 the conglomerate strata get higher and more thick-slaty. The ma- 

 terials entering into its composition are of a large size and much 

 loosened. Along the Castle-town River, the sandstone overlies the 

 limestone. 



