The Jurassic formations of the Colorado Plateau are relatively well understood, but comparatively little is known of their detailed stratigraphy in the high mountains of central and west-central Colorado. Between 1948 and 1955 these rocks were examined in the Elk Mountains (Fig. 1), at first while investigating older rocks in the area (Langenheim, 1952, 1954), and later in the hope of adequately describing and interpreting Jurassic stratigraphy in west-central Colorado. It is intended to continue this project but publication of available information seems justified because of recent requests for some of the measured sections.


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