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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Structural patterns developed throughout western Montana and northern Idaho indicate that sinistral transcurrent movements have played an important role in the tectonic development of the Northern Rocky Mountains Province. Transcurrent movements were concentrated along a series of deep-seated, fundamental shear zones that trend west-northwestward from central Montana and cut obliquely beneath the more northerly trends of the main Cordilleran mobile belt. The shear zones (megashears), which also accommodated considerable vertical movements, are expressed at the surface as a series of outstanding structural and topographic lineaments that are called the Lewis and Clark lineaments.
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