O'Reij.ly — Note on the Amygdaloid Limestone of Downhill. 157 



the oolitic parts, but only partially, and in certain parts, in no ways, 

 attacked the matrix of the oolites. 



This matrix has a distinct colour and crystalline structure, but 

 so far I have been unable to separate it in sufficient quantity to 

 get its density. However, it would seem from the foregoing 

 considerations that this mineral is really constituted of oolitic 

 aragonite in a matrix which presents to a greater or less extent 

 the character of dolomite. 



Q2 



