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The Klamath Mountains province is an accumulation of tectonic fragments (terranes) of oceanic crust, volcanic arcs, and melange that amalgamated during Jurassic time prior to accretion to North America. The nucleus of the province is the Eastern Klamath terrane, which consists of oceanic volcanic and sedimentary rocks ranging from early Paleozoic to Middle Jurassic in age and includes the Trinity ophiolite of Ordovician age. The volcanic arc and melange terranes lying west of the nucleus contain three additional dismembered ophiolites that range in age from late Paleozoic to Late Jurassic and that are sequentially younger oceanward (westward). The volcanic arc terranes also contain preamalgamation plutons that are of Devonian, Permian, and Jurassic age and that are cogenetic with the volcanic rocks they intrude. Following amalgamation, the terranes were stitched together by postamalgamation plutons during Middle Jurassic to earliest Cretaceous time. Accretion of the amalgamated Klamath terranes to North America seems to have occurred during intrusion by plutons of the Shasta Bally belt in earliest Cretaceous time, following large-angle clockwise rotation of the terranes during Triassic and Jurassic time. The accreted terranes are unconformably overlapped along much of the southeastern and eastern perimeter of the province by relatively weakly deformed Cretaceous and Tertiary strata. Along the arcuate western boundary, the rocks of the province are in fault contact with accreted Jurassic and Cretaceous rocks of the Franciscan Complex and related formations of the Coast Ranges province.

Field guide for a GEOMAR & University of Kiel trip across the accreted terranes of the southern Klamath Mountains, California, June 14, 1997