116 WYNNE: GEOLOGY OF EUTCH. [PARTII., 



of this hill also were obtained several specimens of a Pholadomya probably 

 identical with P. Bimkeri, Brauns.j from the Bathonieu beds of 

 Hanover. A large species of Modiola also was common. 



Near the summit of the hill the zone containing the small hexa- 

 gonal and asteroid corals again occurs, while on the sides of the 

 steep ' coomb ' to the north numerous thick fallen slabs present on 

 finely weathered surfaces crowds of Corhula, Trigonia, and other bivalves 

 with some minute and delicately marked spiral shells. 



Half way down the side of the ' coomb ' the rocks are broken through, 

 and cut up by intricate intrusions of solid, gray, spheroidal trap or trachy- 

 dolerite. 



In one or two places these traps have somewhat of a contempora- 

 neous aspect, the jurassics resting upon a volcanic looking mud bed, red 

 in colour, and this upon a similar, but black layer, which is in contact 

 with rudely columnar basaltic trap below. It appears probable that this 

 ' coomb ' has been formed by the wearing away of a large irregular 

 intrusion of trap, outliers of which project above the Runu just at its 

 mouth. 



Near Mooana village some purple and basaltic trap intrusions 

 occur at the junction of the sub-nummulitic and Jurassic rocks, one of 

 which had a bedded or laminated appearance. 



Although species of Rhynchonella, Astarte, and other fossils of the 

 Bela country are more generally distributed than similar ones in the 

 Wagur tract opposite, they are seldom found of such large size. One 

 seems also here to have passed out of that portion of the Jurassic forma- 

 tion characterised by the occurrence of Ammonites, but few even of their 

 fragments having been met with. 



Over much of the lateritic ground, particularly in the neighbour- 

 Ao-ates on lateritic hood of Bela, flints and agates are so numerous 

 grouuds. .^g sometimes to form a coarse gravelly layer on 



( 116 ) 



