AND GEAVELS OP AEDTtW, ETC., IN MULL. 



Fig. 2. — Section of west side of Ravine, Ardtun Head. 

 (Relative thickness of leaf-beds exaggerated.) 



275 



a 



a. Rudely columnar basalt, with 

 grass at foot. 



d. Gravel. 



e. Hard bed, with OnocJea. 



f. Black leaf-bed. 



g. Gravel. 



h. Light leaf-bed. 



i. Amorphous basalt. 



There are many stems in this part of the Black leaf-bed, one of which was 3 feet 

 long and 5 inches across. The light leaf-bed is unfossiliferous here. 



Pig. 3. — Quarry in east side of Ravine, Ardtun Head. 



a. Eudely columnar basalt. 



b. Intrusive sheet. 



c. Sandstone, moi'e or less fissile, 8 ft. 



d. Indurated Gravel, 7 ft. 



e. Hard bed, with Onoclca, 1 ft. 

 /. Black leaf bed, 2 ft. 4 in. 

 g. Indurated gravelly sand, 2 ft. 

 i. Amorphous basalt, with rubble 



