Geology (cont. 4)


During the Cretaceous Period, about 100 million years ago, the continuing plate collision pushed the granitic and metamorphosed sedimentary rocks (changed by the heat and pressure of burial and squeezing) up into huge mountains, which may have been as high as the Andes of western South America are today. These rocks are exposed today in the eroded Peninsular Range Mountains of eastern San Diego County. You can recognize the granitics by the huge boulders they weather into, which are visible on the surface of the hills.  

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