“…U raninite and pyrite, 'associated or not with oxidized products of these minerals, occupy the central part of the nodules, which generally are encased in a zone of manganese and iron oxides (Sharp and others, 1964). In the Montezuma Oanyon area, San Juan County, Utah, ellipsoidal bodies consist of cores of barren iron-stained sandstone as much as 10 feet thick •and 40 feet across, which are enclosed by shells of uranium-•and vanadium-bearing sandstone a few inches to a few feet thick; the surrounding host rock is barren gray sandstone (Huff and Lesure, 1962).…”