"This report describes and provides background for the accompanying preliminary geologic map of Sequoia and Kings Canyon National Parks compiled on the special topographic map of the parks at a scale of 1:125,000. This geologic map of the parks is one-half the scale of the 12 published geological quadrangle maps (scale 1:62,500) that cover more khan half of the parks area. Therefore it was necessary to simplify cartographic detail and to portray a minimum number of lithologic units. .... This open file map, and the explanatory text, is intended as a general assessment of the regional geology of the parks area, as a resource for planning further geologic research in the parks, and as a guide for the park interpretive staff in the geologic framework and geologic history of the parks. It is also an initial step in the preparation of a final map to accompany a popularized report on the geology of the parks."--Page 2.