A new species of an unusual genus of stromatoporoids Stylostroma Gorsky, 1938, S. absurdum sp. nov., first identified in the sediments of the Middle Famennian of the Devonian system of the South Tatar arch of the Volga-Ural oil and gas bearing province, is described. The study of the host rocks revealed an increased content of organic carbon, which allows us to consider the sediments as analogs of oil-maternal rocks.
Antropova et al. (2025) studied this question.