60 



TRAVELS IN BRAZIL. 



hornstone, such as frequently occurs also in the 

 Jura limestone. 



At Europa Point, and on the east side of the 

 rock between the extreme fortifications of Cave 

 Guard, and the fishing bay of La Galetta, there lies 

 over this cavern limestone, the well known and 

 remarkable osseous breccia (a limestone breccia), 

 which, towards the sea, forms a mantle-shaped 

 cavern, and seems here to dip in an angle of about 

 30°. In some places, it fills up the rents, clefts, 

 and corroded hollows in the limestone rock itself. 

 The general cement of this breccia, which is chiefly 

 composed of fragments of the same limestone, is a 

 stalactic mass of considerable hardness, a reddish 

 brown colour, and full of vesicular cavities, which 

 occur, without order, from the size of a poppy 

 seed to an extent of several lines. Sometimes it is 

 itself consolidated into reniform pieces of nearly 

 concentric structure : mixed up with it are pieces, 

 partly rounded, and partly angular, of a smoky 

 grey, and of a light grey limestone, of which the 

 greater part of theM. Calpe consists, and it contains 

 kidneys or nodules of a soft very ferruginous, yel- 

 lowish brown, fine-grained calcareous marl, and 

 rounded grains of quartz of the size of a millet 

 seed. Here and there, are wavy stripes and 

 ' streaks of calcareous spar, and in the vesicular 

 cavities, druses of a white stalactic limestone. The 

 mixture is very hard, and the ingredients, which 

 have often a thicker stalactic crust close to them, 



