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The North American Continent-Ocean Transects Program is a study of the tectonics and Phanerozoic evolution of the transitional region of the North American hemisphere between its bordering ocean basins and the craton or longstable continental interior.

Corridor CI transects the North American Cordillera from the active Mendocino triple junction off the northern California coast, to the North American craton in Wyoming. The North American Cordillera in this transect displays examples of terranes presently being displaced, ancient displaced terranes and deformed North America. The primary aims of this explanatory pamphlet are: 1) to guide and assist the reader in the use of the graphic display; 2) to provide documentation on the sources of data and manner of construction for the graphic display; and 3) to supplement the graphic display with supporting discussions on crustal structure, tectonostratigraphic units, major structures and tectonic evolution. An in-depth synthesis of the CI display will be integrated with that of the C2 display (central California offshore to Colorado Plateau) in the North America Transects Synthesis Volume to be published as part of the DNAG (Decade of North American Geology) series. In order to give the reader a reasonable geological context from which to explore the graphic display and explanatory pamphlet, the first section of the pamphlet will provide an overview of the major tectonic features displayed.

From west to east Corridor C-l (Fig. 1) crosses a number of major tectonic features that record the growth of the North American continental margin throughout the Phanerozoic, as well

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