14 TOPOGRAPHY 



the vesicular cavities, druses of a white stalactitic 

 limestone. The mixture is very hard, and the ingre- 

 dients, which have often a thicker stalactitic crust close 

 to them, are thereby cemented in the strongest man- 

 ner, and very difficult to break asunder.* Petrified 

 bones are very seldom found in this stony mass, 

 but they are more frequent in the more recent 

 bed of the conglomerate or breccia, immediately 

 over it, which contains the same rounded little 

 grains of quartz, and the other ingredients, though 

 of smaller grain, that is, the nodules from the size 

 of a hen's egg to that of a bean, as well as a con- 

 siderable quantity of the light gray limestone, and 

 shows more frequent vesicular cavities." 



The fossils found in this breccia are bones of 

 antelopes or stags, Siberian hares, and rats. Mr. 

 M c Gregor found also those of the ox, sheep, rabbit, 

 tiger, snakes, and birds, and shells, for the most part 

 of land species : he also states having found ova in a 

 high state of preservation belonging to the lizard 

 tribe. f The principal localities of this osseous breccia 

 are Rosia Bay, Camp Bay, Buena Vista, on the 

 east side of the rock above the Governor's cottage, 

 and at the north end of the rock. The fossils above 

 mentioned are in a very decayed state, irregularly 

 thrown together, and lying without any order, so that 



* These reniform bodies, when broken by a hammer, 

 appear to be formed of concentric laminae, occasioned, no 

 doubt, by the slow percolation of water. 



f In the limestone rock of Gibraltar, sea-shells and sea- 

 weeds are occasionally met with. 



