geological units in the region as follows: 1. Coarse-grained and conglomeratic sandstones which transgressive overlain basalts, gently dipping to the south. 2. Agglomerates which developed from sandstones are composed mainly of fragments of Karroo sediments, volcanic carbonatite material, and syenite fragments - cemented with carbonate. The pyroclastic series base consists of agglomerate with carbonatite volcanic bombs and lapilii. 3. Alkali lava flows which cover sedimentary sequence forming tabular igneous bodies elongated to south, represented by rhomb porphyry trachytes and hyalotrahytes Summarized the major events and characteristics of Lupata Series their time of extent was from Lower Jurassic to Lower Cretaceous, and from that time Monte Muambe, as a part of volcanic system of the East African Rift, represent carbonatite extinct volcano Carbonatitic Complex During the Lupate Series formation, in the phase of alkali magmatism, syenite and later carbonatite were also intruded. The concave bottom of caldera, about 5 km in diameter, consists of carbonatite, agglomerate, tuff, feldspathic rocks (fenites) and basic dykes. The bottom periphery, 0.5 km wide, is mostly built of feldspathic rocks and little or no carbonatite. The central circular part of highly dissected, craggy hills of carbonatite is asymmetrical and about 200 m lower than Karroo ridge. It is composed of relics of carbonatite intrusion, now appearing as carbonatite ring and subsided central part. The carbonatite ring is characterized by vertical scarps on inner side, with surface which often shows irregular knots, nodes, or veins of more resistant (silicate) material. Laterite covers are formed on both sides of carbonatite ring with accumulation of residual ferruginous-manganese minerals. Carbonatitic rocks are characterized by considerable variation, or great variety of textures, while the mineral composition is quite uniform and chiefly independent of texture. According to texture of carbonatite, can be distinguished: hypidiomorphic granular, medium-grained, pseudoporphyric and trachytic. The most abundant are carbonatites with granular texture, while porphyric and trachytoid carbonatites are much less abundant. Porphyric carbonatite are formed by fast cooling of semi-crystallized magma, or in contact with cool environment. The primary crystallized and fast crystallized calcites form phenocrysts and fine-grained groundmass, respectively. The slower cooled magma obtained granular texture. Carbonatitic magma was probably separated during the differentiation and crystallization of syenites and alkali basic rocks. The primary silicate magma was enriched with alkalies, carbon-dioxide, calcium and deficient with silica. During the alkali syenite crystallization, the carbonate portion of silicate magma was separated forming carbonatitic magma. Alkalies were already linked