ИХНОФОССИЛИИ И ПАЛЕОПОЧВЫ ПАЛЕОЦЕНА РАЗРЕЗОВ «ПРИВОЛЬСК» И «ШИХАНЫ» САРАТОВСКОГО ПОВОЛЖЬЯ

Abstract

The article discusses the results of preliminary studies of the Paleocene sections “Privolsk” and “Shikhany” from the Saratov Volga region. A complete description of the geological structure of the sections is given for the first time. Ichnoassemblages, ichnofacies and paleosols are identified. There is an alternation of sands and sandstones of glauconite-quartz, and quartz of various degrees of density (up to quartzite), mainly light dirty gray, micaceous, fine-grained, sometimes obliquely layered. Some of the layers are strongly bioturbated, others are less bioturbated, occasionally there are thin (up to 1 cm) extended interlayers of clays in the studied sections. Fragments of the wood trunks in a sandstone crust, sometimes with elements of the root system, as well as leaf imprints and plant debris, frequent remains of invertebrates are found in many layers. There are at least one well-defined paleosol profile and several undeveloped FPS profiles (fossil paleosols). In total, there are 12 layers or beds from 1 to 5 m each in the summary section, with a total thickness of 25-28.5 m. The entire section is permeated with a variety of ichnofossils that stand out on the weathered surface. According to their morphology, the ichnofossils are divided into several groups that characterize the certain ichnofacies and reflect specific sedimentation environments