26G D E SCRIP T I V E CATALOG U E. 



G77. Metamorphosed argillaceous slate, with intercalations of basaltic rock. 



678. Altered argillaceous slate — colour, grayish black; joints and seams coated 

 with carbonate of lime. 



679. Greenstone (?) — a close-grained, compact rock; slightly crystalline in struc- 

 ture. 



680. Metamorphosed marly clay — colour, red; very compact; has a trappous 

 appearance. 



