. The geology of the goldfields of British Guiana. ) t(j their sources they aflbrdeasy means of transport to a large number of East Indian, Portuguese,and other settlers who have taken up grants of Crown land for agri-cultural purposes, and have established small farms along their banks. Jfou/itain, Baiufes.—One of the most prominent features of thecountry is the great central mass of mostly flat-topped mountains,known as the Pakaraima Group or Chain, which occupies the most {_To face page 14. Plate SOUTHERN EDGE OF MOUNT RORAIMA. Sandstone Mountain and Elevated Table-laud 8,635 feet above
. The geology of the goldfields of British Guiana. ) t(j their sources they aflbrdeasy means of transport to a large number of East Indian, Portuguese,and other settlers who have taken up grants of Crown land for agri-cultural purposes, and have established small farms along their banks. Jfou/itain, Baiufes.—One of the most prominent features of thecountry is the great central mass of mostly flat-topped mountains,known as the Pakaraima Group or Chain, which occupies the most {_To face page 14. Plate SOUTHERN EDGE OF MOUNT RORAIMA. Sandstone Mountain and Elevated Table-laud 8,635 feet above sea level, and rising with perpendicularcliffs of about 2,000 feet to a height of about 5,000 feet above the surrounding plateau. Photo hy C. TT. Anderfo». General Physical and 7\>pi)t/rnp/ttcal Featitres. 15 western porti(jn of the interior of the culuny, and stretches southwardfrom the Cuyuni River to within 30 miles above the mouth of theIreng River, and eastwards to the Essequib > River between thePotaro and Rupununi Rivers, whilst certain s^jurs of these mountainscontinue beyond the Essequibo River right across the colony as far asthe Courantyne River. The bulk of these mountains form a successive series of terraces andbroad, undulating plateaus, with bold, and in some cases, perpendicularsandstone escarpments varying in Jieight from about 1,200 feet to over2,000 feet, and eventually forming a large undulating tableland at anaverage height of about 3,500 feet above the sea level. In
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