1911 Encyclopædia Britannica, Volume 24… (1911)
“ The forests are of considerable value. The geological structure of the district is mostly gneissic, with a few irruptive rocks in the form of trap dikes and granite veins. Magnetic iron ore is common in the hill regions, and corundum and chromate of iron are also obtainable. The qualities of the soil differ very much; in the country immediately surrounding the town of Salem a thin layer of calcareous and red loam generally prevails, through which quartz rocks appear on the surface in many places. The climate, owing to the great difference of elevation, varies considerably ”
