Using an electron scanning microscope equipped with a microprobe chemical analyzer, organic remains of an unclear systematic position from the core of the Payakhskaya 1 well were studied. According to experts, in this section the boundary between the Middle and Upper Jurassic is located within the interval containing our finds. Therefore, the identification of relicts of colonial calcareous organisms, first discovered in the Yenisei-Khatanga basin, seems to be important. According to the complex of features reported in the description, a similarity of fossils with the representatives of Chaetetidae was proposed, and critical comparison with other organisms having a mesh-cellular structure was provided.