Characteristics of the Middle Cenomanian rhythmic sequence from Mount Selbukhra in southwest Crimea
Journal: Moscow University Geology Bulletin
Year: 2012

New lithological, ichnological, and isotope data are given for the rhythm from the section of the Middle Cenomanian rhythmic sequence at Mount Selbukhra. The intense rock bioturbation has distinct multistage structure that is typical of writing chalk sections and corresponds to the Cruziana ichnofacies that are characteristic of the soft grounds of the open shelf. The values of the δ13C and δ18O ratios in ichnofossils contradicts the model of the farming structures for the Chondrites and Zoophyc