187 



Granite. — Boulders in the jS'epean Eiver. 



Ironstone, 



Lydian Stone (shale indurated by contact with a dyke of 

 igneous rock). 



Feat. — On the coast, near Manly. 



Poriiliyrif. — Boulders in the Nepean E-iver. 



Quartzite (sandstone indurated by contact with a dyke of 

 igneous rock). 



Sandstone (crystalline, micaceous, felspathic, graphitic, and 

 ferruginous varieties). 



Shale (laminated, micaceous, sandy, carbonaceous). 



Volcan ic Agglomerate. — Hornsby. 



