6^4 



savannahs of Barcelona (near Curataquiche) 9 

 belong* to the sandstone of the Llanos of Cala- 

 bozo, or to a soil superposed on that sandstone? 

 The former of these suppositions would ap- 

 p roach, according to the analogy of the obser- 

 vations made by M. Roziere in Egypt, the 

 sandstone of Calabozo of tertiary nagelfluhe* 

 (Vol. vi, p. 49). 



VII. FORMATION OF COMPACT LIMESTONE OF CUMA- 

 NACOA. 



A blueish-grey compact limestone, almost 

 destitute of petrifactions, often crossed by small 

 veins of carburated lime, forms mountains with 

 very abrupt ridges. These layers have the 

 same direction and the same inclination (Punta 

 Delgada, on the east of Cumana) as the mica- 

 slate of Araya. Where the flank of the lime- 

 stone mountains of New Andalusia is very 

 steep, we observe, as at Achsenberg, near Al- 

 torf, in Switzerland, layers that are singularly 

 arched or turned. The tints of the limestone 

 of Cumanacoa vary from darkish-grey to 

 bluish-white (Bordones; centre of Cerro del 

 Impossible ; Cocollar; Turimiquiri; Montana 

 de Santa-Maria), and sometimes pass from 

 compact to granular. (Vol. ii, p. 263 ; iii, p. 

 11, 76, 80, 94, 175.) It contains, as substances 

 accidentally disseminated in the mass, brown- 



