Conodont elements were studied from the Kamenka River section in the southern part of the Pechora Swell (northern Cis-Urals, N 65[degrees]04'27.4", E 56[degrees]42'50.9") (Fig.
The predominance of organic-rich lamellar and paralamellar tissues in these conodont elements makes them suitable for this study (Muller & Nogami 1971).
The study of thin and polished sections of conodont elements in association with micro-CT and optic microscopy data allow elaborating the histological model of the P1 element of P.
The diagenetic degradation of the organic matter of conodont elements was estimated by their demineralization in 1N solution of HCl.
In any case similar preservation of the studied conodont elements provides uniform degradation of organic matter and suggests good preservation of relative variations in the isotope composition.
contained in this biozone were identified as follows: Merrillina divergens, Hindeodella triassic, Hideodus excavates.
Many conodont elements
formed notched blades, similar to the cheek teeth of modern mammal carnivores like cats and dogs.
Alternation of bleaching and Stoddard's solvents was the most effective in breaking down the rock, but the sparse conodont elements
were badly broken as a result of such processing.
The redeposition, reworking, and mixing rate of conodont elements differs significantly along the klint area, being largest in the western part.
This conclusion is also supported by the lack of redeposited conodont elements in this part of the basin.
On the other hand, differences in the apatite lattice parameter values of various histological types of mineralized matter of conodont apparatus reported earlier (Zhuravlev & Sapega 2007) should be expressed as decrease in the crystallinity of the studied samples, causing the lowering of the lattice parameter a for a bulk sample of conodont elements
. While this phenomenon was not recorded, we explain it by prevalence of enamel-type tissue in conodont material.
The same situation is recognized in the Uuga section, NW Estonia, where conodont elements
of these two zones are mixed in the whole range of the P.