New species of the genus Blattinopsis Giebel, 1867 (Insecta: Blattinopsida: Blattinopsidae) from the Permian of Taimyr Peninsula, Russia

Blattinopsis indefinitus Rasnitsyn et Aristov, sp. n. is described from the Lower Permian Fokina locality (the upper Burgukla subhorizont of the upper Kungurian Stage) in North-Western Siberia. It is the latest record of the genus Blattinopsis Giebel, 1867.

Hydrogeochemical characteristics of underground waters in the suture zone of the Ufa brachyanticline and the Pre-Urals foreland basin

During the period of long-term research, since the end of the XIX century, a large hydrogeochemical material has been accumulated within the suture zone of the Ufa brachyanticline and the Pre-Urals foreland basin. There are very few works on studying the conditions of natural water formation from the perspective of modern methodologies based on the study of variations in the isotope ratios of hydrogen and oxygen within the study area. The main goal of the work is to establish the conditions for the formation of the isotopic and chemical composition of groundwater of the Lower Perm aquifer complex, which is distributed within the suture zone of the Ufa brachyanticline and the Pre-Urals foreland basin, which belongs to the Kishert karst region. The features of the formation of the chemical and isotopic composition of groundwater in the suture zone of the Ufa brachyanticline and the Pre-Urals foreland basin in the Kishert region are analyzed based on data obtained in the period 2017–2018. In the Western part of the region, there is a watered zone associated with tectonic disturbances, where karst water is discharged. The chemical composition of the karst waters of the Kishert region has been studied quite fully. Data on the isotopic composition (deuterium and oxygen–18 content), which has been studied to a lesser extent, were used for a detailed study of the conditions for the formation of groundwater composition. In addition, the chemical and isotopic composition of precipitation and river water is considered. It is shown that the source at the Nizkoe village, discharging near the contact of carbonate-sulfate and terrigenous rocks, is characterized by the НСО3 –SO4 –Ca–Mg composition and mineralization 550,0–738,0 mg/dm3 , the source at the Zuevo village, which unloads within distribution of terrigenous rocks of the Kungurian stage, has a SO4 –Ca composition and high mineralization of 1623,0-2110,0 mg/dm3 . The isotopic composition of the two sources varies within rather narrow limits and is lighter than the weighted average value of atmospheric precipitation, which indicates that these sources are primarily recharge by light snow waters of the winter and spring periods. The waters of the lakes Molebnoe and Proval mainly НСО3 –Ca composition, they are characterized by vertical hydrochemical zonality associated with a change in chemical parameters. An increase in the mineralization of lake water indicates a groundwater inflow from sulfate (Proval lake) and carbonate (Molebnoe lake) sediments of the Kungurian stage. Lake waters have the heaviest and relatively stable composition due to the processes of evaporation from the surface and discharge of deep waters at the bottom of the lakes. The relationship between atmospheric precipitation, river waters and the waters of Proval lake and the source of the village of Nizkoe was established, and for the Zuevsky source only with river waters. A weak correlation was revealed for the Molebnoye lake with precipitation (r = 0,25) and river waters (r = 0,12).

The mazuevka locality (Lower Permian, the middle CIS-Urals, Perm region): new data on its taxonomical composition and palaeoecology

The paper is focused on characteristics of the peltaspermalean pteridosperms from the Lower Permian (Kungurian stage) of the Mazuevka locality (Kishert District of the Perm region, Russia). The paper is based on the material kept in the paleobotanical collection of the Earth Science Museum of the Lomonosov Moscow State University. The peltasperm seed-bearing organ is characterized for the Mazuevka locality for the first time. This organ is preliminarily determined in open nomenclature as Peltaspermum sp. General considerations by the present authors on the possible entomophily of at least some representatives of peltaspermalean pteridosperms are given.

An examination of the impact of Olson’s extinction on tetrapods from Texas

It has been suggested that a transition between a pelycosaurian-grade synapsid dominated fauna of the Cisuralian (early Permian) and the therapsid dominated fauna of the Guadalupian (middle Permian) was accompanied by, and possibly driven by, a mass extinction dubbed Olson’s Extinction. However, this interpretation of the record has recently been criticised as being a result of inappropriate time-binning strategies: calculating species richness within international stages or substages combines extinctions occurring throughout the late Kungurian stage into a single event. To address this criticism, I examine the best record available for the time of the extinction, the tetrapod-bearing formations of Texas, at a finer stratigraphic scale than those previously employed. Species richness is calculated using four different time-binning schemes: the traditional Land Vertebrate Faunachrons (LVFs); a re-definition of the LVFs using constrained cluster analysis; individual formations treated as time bins; and a stochastic approach assigning specimens to half-million-year bins. Diversity is calculated at the genus and species level, both with and without subsampling, and extinction rates are also inferred. Under all time-binning schemes, both at the genus and species level, a substantial drop in diversity occurs during the Redtankian LVF. Extinction rates are raised above background rates throughout this time, but the biggest peak occurs in the Choza Formation (uppermost Redtankian), coinciding with the disappearance from the fossil record of several of amphibian clades. This study, carried out at a finer stratigraphic scale than previous examinations, indicates that Olson’s Extinction is not an artefact of the method used to bin data by time in previous analyses.

New representatives of the species Kerpia samarica from the location Novyi Kuvak (kazanian stage, Samara Region)

The article is devoted to the study of new representatives of the genus Kerpia Naugolnykh from Novyi Kuvak located in Shentalinsky district (northeast of Samara region). The genus Kerpia for ginkgo similar leaves was set by S.V. Naugolnykh in 1995 on the material from the Kungurian stage of the Middle Urals. Typical species of this genus is Kerpia macroloba Naugolnykh. In the diagnosis of the genus S.V. Naugolnykh showed the most important signs of this genus: presence of lobes and sinuses of the 1st and 2nd order, distinct petiole and two veins included in lamina from the petiole. Later, in 2001, from the sediments of Kazanian stage of the Southern Urals S.V. Naugolnykh described a new species Kerpia belebeica Naugolnykh. In 2013 in Novyi Kuvak location we found impressions of ginkgo similar leaves with on the one hand a great similarity with the known members of the genus Kerpia ( Kerpia macroloba and Kerpia belebeica ), but on the other hand they are clearly not identical to this representative at the species level. According to the results of the study of these impressoins in 2014 we described a new species of the genus Kerpia - Kerpia samarica N.S. Bukhman et L.M. Bukhman, 2014. In this paper we give description of both known and new findings of species Kerpia samarica and a comparison of this species with other species of the genus Kerpia .

Permian volcanics in the Northern Gemericum and Bôrka Nappe system: U-Pb zircon dating and the implications for geodynamic evolution (Western Carpathians, Slovakia)

Permian volcanics in the Northern Gemericum and Bôrka Nappe system: U-Pb zircon dating and the implications for geodynamic evolution (Western Carpathians, Slovakia)U-Pb dating (SHRIMP) of magmatic zircon ages from the Northern Gemericum Permian volcanics (Petrová Hora Formation) yielded the Concordia age of 272.4 ± 7.3 Ma for basaltic andesite, as well as the Concordia age of 275.2 ± 4 Ma for rhyodacites. Both zircon ages correspond to the Cisuralian Epoch in the time span of the Kungurian Stage. Acquired206Pb/238U zircon age data support the nearly contemporaneous origin of the acid and basic volcanogenic members in the Northern Gemericum Permian strata. The bimodal volcanic suite proves the transtension/extension tectonic regime in the North Gemeric sedimentary basin during the Late Cisuralian. The magmatic zircon ages of rhyodacites, occurring in the lower thrust sheet of the Bôrka Nappe (Jasov Formation), gave a younger Concordia age of 266 ± 1.8 Ma proving the Guadalupian Epoch, in the time span of the Wordian/Capitanian. In comparison to the Northern Gemericum realm, this age refers to the relatively younger stage of rift-related extensional movements. In the wide Alpine-Dinarides realm the Middle Permian (Guadalupian) movements are related to the beginning of the Alpine sedimentary cycle. Thus, the Middle Permian rifting expresses the beginning of the formation of the future Meliata oceanic trough.