CENTRAL GEOLOGICAL SURVEY, MOEA

	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

:::Eastern Coastal Range

General Description	Stratigraphy and Lithology	Geologic Structure	Geologic History	Longitudinal Valley of Eastern Taiwan

General Description

The Coastal Range lies between the Longitudinal Valley and the eastern coast of Taiwan. This range is about 135 kilometers long, a maximum of 10 kilometers wide, and only 3 kilometers wide at the northern and southern extremities. Two prominent southern offshore islands, Lutao and Lanhsu, are also included in this geologic province. In the plate tectonic model, the Coastal Range is the remnant of a westward-facing Neogene island arc, the Luzon Island Arc, on the leading edge of the Philippine Sea plate. The Coastal Range is thus considered the northern continuation of the Luzon Island Arc and the Luzon Trough to the south (Biq 1972a; Bowin et al., 1978; Chi et al., 1981).

The core of the Coastal Range and the two offshore islands are underlain by Miocene to Pliocene andesitic arc rocks. Overlying the volcanic series, the main part of the Coastal Range is composed of imbricate thrust sheets of Miocene, Pliocene, and Pleistocene volcanogenic and flyschoid rocks. In the classical geosynclinal model, the Coastal Range would be considered to be eugeosynclinal and this eugeosynclinal belt contrasts with the miogeosynclinal fold-and-thrust belt in western Taiwan in the predominance of typical flysch deposition and abundance of volcanogenic and volcaniclastic rocks.

:::© CENTRAL GEOLOGICAL SURVEY, MOEA

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