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Introduction
Earlier Geologic Maps of Taiwan
Geographic Setting
General Geology And Geologic Provinces Of Taiwan
Explanation Of Legend And Representation Of Geologic Data
Eastern Central Range
Western Central Range Backbone Ridges
Western Foothills
Eastern Coastal Range
Geology Of The Hengchun Peninsula
Major Geologic Features Of Taiwan
Plate Tectonic Setting
References


:::Western Foothills
General Stratigraphy Oligocene Stratigraphic Units Miocene Stratigraphic Units Miocene Rocks on Tiaoyutai Island Pliocene Stratigraphic Units
Quaternary Stratigraphic Units Volcanism and Volcanic Rocks Diastrophism and Orogenic Movements General Structural Features Geologic History
The geologic province of the western foothills is the site of a Late Cenozoic sedimentary basin west of the Central Range. Recent paleontologic studies indicate that sedimentation in this basin began in Oligocene time and continued into the early Pleistocene, Major orogeny began in early Pleistocene time, and all the sedimentary units in this western basin have been folded and faulted to form the geologic structures of the western foothills. The western foothills are composed of a series of mountains and rolling hills flanking the western margin of the Central Range, but the boundary between the two is topographically not well-defined. The geologic boundary, however, is marked by the Chuchih fault, a tectonic line that separates the western foothills from the upthrust argillite-slate series of the Central Range to the east.
The western foothills gradually merge westward into the tablelands and coastal plains bordering the Taiwan Strait. The Penghu Islands in the Taiwan Strait and the Hengchun Peninsula at the southern tip of the island of Taiwan are also included in this geologic province. Since the Restitution of Taiwan, this geologic province has been extensively studied and mapped, because it is the most important one economically, including all the leading coal and oil fields of Taiwan. These deposits of fossil fuels may also continue westward under the western coastal plains and offshore areas. Therefore the western foothills make up the most well-known geologic province of Taiwan, and pertinent geologic data are much more abundant than those of the other provinces.


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