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[[page number]] 22 [[/page number]] [[pencil]] Jamaica 21. [[/pencil]] The geologic history may be summarized as follows: (a) two periods of mountain-folding, trending south-east to north west and east to west respectively; (b) two great epochs of subsidence and contraction of land area, during which the limestones were deposited; and (c) later uniform elevation which added the modern coastal plains. [[margin]] CE [[pencil]] C [[/pencil]] [[/margin]] "The rivers differ in the mountainous districts and in the limestone plateau, giving two distinct types of drainage, the one simple and consequent on uplift, the other, mainly underground and having no surface-outlets to the sea. A third, more complicated type of drainage, is a combination of these two, and has originated by the capture of interior-basin streams by consequent streams belonging to the first type. The total number of rivers and streams exceeds one hundred, and many of them are of large dimensions and flow all the year round, exhibiting torrential magnitude during the rainy season." [[end page]] [[start page]] [[blank page]]
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