Uranium occurrences in sedimentary rocks exclusive of sandstone

A classification of uranium deposits in sedimentary rocks, presented earlier (Jones, 1978), contained nine major classes. In the present report, the first eight of these classes (placers, quartz-pebble conglomerates, marine black shales, phosphorites, water, lignite and related rocks, evaporative precipitates, and limestones) are described in greater detail and summarized by a set of recognition criteria. Recognition criteria for the ninth class, sandstone deposits, are presented elsewhere (Austin and D'Andrea, this volume). Headings for the recognition criteria include geologic setting, host-rock characteristics, uranium mineralogy, and geometry of the ore. The recognition criteria are followed by a list of selected references