PALEOCENE AND LOWER EOCENE OSTRACODA FROM THE UMM ER RADHUMA FORMATION OF SAUDI ARABIA'

Abstract.—Six species and one subspecies of trachyleberidid ostracodes are described and illustrated from the Umm er Radhuma Formation (Paleocene-Lower Eocene). Of these, four are new species, Gyrocythere celata, Hermanites straba, Anommatocythere porata, and Hornibrookella abdulrazzaqi; and one is a new subspecies, Hornibrookella quin-quecellulosa irregularis. THE UMM ER RADHUMA Formation is divided into two major units, an upper dolomitic lime-stone of early Eocene age and a lower lime-stone-shale unit of Paleocene age. These units, designated "upper Umm er Radhuma " and "lower Umm er Radhuma " respectively, are separated by an unconformity that causes loss of section locally in crested areas. The upper Umm er Radhuma is more porous than the lower unit, consisting of tan t