Published online by Cambridge University Press: 01 May 2009
Facies change and lithological variation traceable in the outcrop of the Permocarboniferous rocks exposed over portions of some 1,400 square miles of jungle country in north-west Pahang and south-west Kelantan are outlined in this paper. The area, some 70 miles N.–S. and 10 to 25 miles E.–W., is bounded by the 101° 45′ E. meridian in the west and by the Gunong Tahan and Gunong Benom Ranges in the east (Text-fig. 1A). The territory described lies mostly in Ulu Pahang of which a reconnaissance map, scale 8 miles to an inch, and a memoir have been published by Scrivenor (1911). Between 1937 and 1941 the 1,200 square miles lying between meridians 101° 45′E. and 102° 00′E. have been mapped partly on the scale of 1½ inches and partly 2 inches to a mile. The geology of the southernmost 300 square miles (Sheet 3 B/4, Raub) has been described by Willbourn (A.R., 1933–34) and the writer (1939); interim reports on the 300 miles (Sheets 2 N/16, Benta, and 2 O/13, Lipis) immediately north have been published by Service (A.R., 1938–1940), and of the northern 600 square miles (Sheets 2 N/12, Chegar Perah, and 2 N/8, Merapoh) by the writer (A.R., 1937–1940; 1946).