625 



iron-ore, spathic iron, (Vol. iv, p. 384,) and 

 even rock-crystal * ; and as subordinate layers, 

 1st. numerous strata of earburated and slaty 

 marl, with pyrites (Cerro del Cuchivano, near 

 Cumanacoa) ; 2d. quartzous sandstone, alter- 

 nating with very thin strata of clayey slate. 

 (Quetepe, south of Cumana ; Cerro del Impos- 

 sible; table-land of Cocollar; Cerro de Saca 

 Manteca, near Catuaro, probably also the basin 

 of Guarda de San Agustin, and the Purgatorio). 

 This sandstone contains springs. In general it 

 only covers the limestone of Cumanacoa, but 

 it appeared to me to be sometimes inclosed 

 (Vol. iii, p. 11/23, 94, 181) ; 3d. gypsum with 

 sulphur, near Guire, in the Golfo Triste, on the 

 coast of Paria (Vol. iv, p. 386). As I did not 

 examine on the spot the position of this yellow- 

 ish-white gypsum with small grains, I cannot 

 pronounce with certainty on its relative age. 

 The only petrifactions of shells which I found 

 in this limestone formation, are a heap of tur- 

 binites and trochites on the flank of Turimi- 

 quiri, at more than 680 toises high, and an 

 ammonite §even inches in diameter, in the 

 Montana de Santa Maria, north north-west of 

 Caripe. I no where saw the limestone of Cu- 

 manacoa, of which I treat specially in this ar- 



* The zechstein of Gross-Oenner in Thuringia, also in- 

 closes rock-crystal, Freieslehen, Vol. in, p. 17. 

 VOL. VI, 2 T 



