Middle carboniferous phosphorites of the Yayyu suite in the Nyan’vorgavozh river basin (the Lemva paleotectonic zone of the Urals)

Results of study of structures and composition of Middle Carboniferous phosphorite concretions in the Lemva paleotectonic zone are presented. The complexconstruction of the geological section is shown and Middle-Late Carboniferous fossils are presented. A variety of calcium phosphate microstructures (cryptocristalline, coagulatio-clotted, microbiomorphic, radiated) which is classified as a carbonate fluorapatite, and a version of its formation is suggested.