- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Coal veins are described occurring in fissures cutting steeply through horizontal or gently dipping alluvium and sometimes passing into decomposed bed rock. More recent superficial deposits cover the eroded tops of the veins. Detailed descriptions are given which leave "no doubt that the coal found as veins in these thirteen localities in Perak is very much younger than coal mined at Batu Arang, Selangor, known to be upper Tertiary, and the clearly established very recent age of the coal veins is not the least interesting feature of these unusual occurrences. As suggested by Sir Lewis Fermor, it is probable that the gel material constituting the coal veins originated from wood in the alluvium." The coal is of sufficient quality but the veins are not wide enough to merit commercial exploitation.