Vol. 60. 



IGNEOUS ROCKS AT SPRING COVE. 



16: 



in with clear secondary calcite, Avhile limonite and haematite have 

 been subsequently deposited. 



In some instances the limestone, more especially that occurring 

 as irregular lumps in the tuff, is so cracked and broken, evidently 

 during the movement of the flow, as to suggest that it must have 



Fig. 8. — Portion of an included lump of limestone in basalt. 



been hard and consolidated before the extrusion of the lava, and 

 was probably torn from the vent and ejected with the igneous 

 matter. 



Small oval bodies, generally a few inches long, occur in the basalt: 

 these, when broken, show a yellow or red shell of carbonate of lime, 



