Andrew. — On the Clarendon Phosphate-deposits. 469 



hill, and have probably slipped down from there. They show 

 clearly that the formation of the rock-phosphate was subsequent 

 to the pouring-out of the basaltic lava which now caps the hills. 

 They indicate, moreover, that the formation was some con- 

 siderable time after that — in fact, not until the surface features 

 of the district had assumed practically their present form — for 

 not until a hill was formed would basalt-fragments be able to 

 slip down that hill and mingle with limestone and sands lying 

 at a lower level. 



3. Horseshoe Bush. — Close to the Horseshoe Bush two small 

 outcrops have been exposed, but only a few tons of phosphate 

 have been mined. 



4. Discovery Point. — It was at this point, opposite the pre- 

 sent workings of Bound Hill quarry, that the original discovery 

 of the rock-phosphate was made. The phosphate here rests 

 on top of the glauconitic limestone ; it has not been mined to 

 any extent. 



N.E. 



S.W. 



Face of Quarry at Round Hill. 



b. Green phosphatic sands, c. Rock - phosphate, e. Basalt - fragments. 

 /. Overburden (clay), g. Glauconite sands. 



5. Round Hill Quarry. — This is now the scene of greatest 

 activity in the district. During 1902 (i.e., during the seven 

 months following the discovery) between 2,000 and 3,000 tons 

 of phosphate were mined from the Kiln Point and Bound Hill 



