This map of selected post-Nevadan features is in a sensesupplementary to Map I-2148 (Geologic map of the Klamath Mountains,compiled by W.P. Irwin, 1994). The map of selected post-Nevadangeologic features is in large part a compilation of the publishedwork of many geologists (see Fig. 1--Index map showing sources ofdata). The principal focus of Map I-2148 concerned the assemblageof terranes that constitute the principal bedrock of the KlamathMountains. The terranes of the Klamath Mountains variously consistof rocks that range from Cambrian to Late Jurassic and perhaps evenearliest Cretaceous age. All of these terranes have been subjectedto episodes of metamorphism, plutonism, and tectonism, including amajor widespread tectonic event which occurred mainly in Jurassictime and which generally is referred to as the Nevadan orogeny.The geologic map database delineates map units that are identifiedby general age, lithology and clast size following the stratigraphicnomenclature of the U. S. Geological Survey. The scale of thesource map limits the spatial resolution (scale) of the database to1:500,000 or smaller.