386 



fracture, somewhat analogous to the formation 

 of Caripe *, and consequently to that of Jura, 

 lies on the red sandstone between Tisnao and 

 Calabozo : in several other places, for instance 

 in the Mesa de San Diego, and between Ortiz 

 and the Mesa de Paja-f, we find above the lime- 

 stone lamellar gypsum alternating with strata 

 of marl. Considerable quantities of this gypsum 

 are sent to the city of Caraccas situate amid 

 primitive mountains. 



This gypsum generally forms only small beds, 

 and is mixed with a great deal of fibrous 

 gypsum. Is it of the same formation as that of 

 Guire, on the coast of Paria, which contains 

 sulphur? or do the masses of this latter sub- 

 stance, found in the valley of Buen Pastor and 

 on the banks of the Oroonoko, belong, with the 

 argillaceous gypsum of the Llanos, to a second- 

 ary formation much more recent §? 



* See vol. iii, chap, vi, p. 107 ; chap, viii, p. 175; chap, 

 xi, p. 365. Does this formation of secondary limestone ot 

 the Llanos contain galena } It has been found in strata of 

 black marl, at Barbacoa, between Truxillo and Barquesi- 

 meto, North -West of the Llanos. 



+ Also near Cachipe and San Juacquim, in the Llanos of 

 Barcelona. 



X This trade is carried on at Parapara. A load of eight 

 arobas sells at Caraccas for twenty-four piastres. 



§ See above, ch. ii, vol. i, p. 257 ; chap, vi, vol, iii, p. 108; 

 and chap, xiv in the present volume. 



