MORPHOLOGY OF THE FIRST MANDIBULAR TOOTH MICROTUS GREGALIS (RODENTIA, ARVICOLINAE) FROM THE MIDDLE PLEISTOCENE OF THE PRE-ALTAI PLAIN

2021 ◽  
pp. 86-91
Author(s):  
D. G. Malikov ◽  
◽  
S. E. Golovanov ◽  
◽  
Keyword(s):  
Morphological Study ◽  
Morphological Structure ◽  
Intermediate Position ◽  
Middle Pleistocene ◽  
Morphometric Data ◽  
Alluvial Deposits ◽  
Mandibular Tooth ◽  
Modern Species ◽  
Lower Molar

In this paper morphological structure of the first lower molar m1 tooth of the narrow-skulled vole from alluvial deposits of the Pre-Altai Plain Middle Neo-Pleistocene is described. Morphological study of the vole remains showed that they belong to the modern species Microtus gregalis. At the same time, the study sample showed significant differences, both in morphological structure and in the size of the first lower molar, in comparison with the recent representatives of the same territory. The set of morphological and morphometric data shows that the studied voles occupy an intermediate position between M. gregaloides of the Early and M. gregalis of the Late Neo-Pleistocene. The ratio of m1 morphotypes also showed the relative primitiveness of the M. gregalis sampling. Morphological study of remains of the narrow-skulled vole from the Solonovka, Petropavlovskoe and Malinovka-4 locations confirmed the previously determined age for sediments containing the remains of microtheriofauna.

scholarly journals SOLONSKE SECTION AND THE PERSPECTIVES OF THE STUDY OF PLEISTOCENE CARPATHIAN FORELAND

2019 ◽  
pp. 73-100
Author(s):  
Roman Hnatiuk ◽  
Igor Papish
Keyword(s):  
Field Study ◽  
Key Words ◽  
Middle Pleistocene ◽  
Buried Soils ◽  
Iron Compounds ◽  
Main Attention ◽  
Alluvial Deposits ◽  
River Terraces ◽  
The Village ◽  
Made In

The article presents the results of the field study of the two artificial outcrops of the Pleistocene deposits, which are located in the suburbs Solonske near Drohobych city. Outcrops (careers) are located within the terrace of the Tysmenytsia River. The height of the terrace is about 50 m above the river level and changes along the distance from the mountains. The main attention in the article is paid to the study of the structure of the upper (covering) stratum of the terrace with a thickness of about 26 m, and also to the characteristics of its consolidated stratigraphic section. The basis of this stratum consists of the layers of non-carbonate loams and clays. They are more or less enriched of iron compounds and gleyed. Between them there are four horizons of buried soils of the interglacial and interstadial rank. Based on the observations made in the field, it was found that the sediments of the covering stratum have mainly river origin. The conditions of their accumulation, as well as the conditions for the formation and transformation of ancient soils, are considered; eight pre-Holocene lito- and pedostratigraphic layers of different rank are singled out. The division of the covering stratum of the terraces into three main layers is sub¬stan¬tiated, which is equivalent to the stratigraphic units of the glacial and interglacial rank. Comparison of the Solonske section with other sections of the similar height terraces, in particular with well-known outcrops near the village Dubrivka (section Dubrivka) gives grounds to assume that the formation of a local terrace occurred during the Marine Isotopic Stages 12 to 10. Consequently, the Solonske section represents a short strati¬gra¬phic interval of the Middle Pleistocene (not the three main Pleistocene units as stated in the results of its previous study). It can be the basis for studying only a few (two to three) horizons of the glacial/interglacial rank. At the same time, it is potentially a very impor¬tant key section of the Solonske (Dubrivska, Dovhivska, Varnytska) terrace of the Pre-Dniester. The studying of Solonske outcrops makes it necessary to revise the popular notions about the origin and the age of the so-called covering stratum of the river terraces of the Carpathian Foreland and Podolian Pre-Dniester, its stratigraphic filling and significance. Key words: alluvial deposits; terraces; soil-loess sequence; Middle Pleistocene; Dniester valley; Carpathian Foreland; Solonske section.

scholarly journals A Long-Term Record of Quaternary Facies Patterns and Palaeonvironmental Trends from the Po Plain (NE Italy) as Revealed by Bio-Sedimentary Data

Geosciences ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 401
Author(s):  
Veronica Rossi ◽  
Alessandro Amorosi ◽  
Giulia Barbieri ◽  
Stefano Claudio Vaiani ◽  
Matteo Germano ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Middle Pleistocene ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Environmental Response ◽  
Alluvial Deposits ◽  
Po Plain ◽  
Ne Italy ◽  
Coastal Marine

Understanding Quaternary dynamics of delta-coastal plains across multiple glacial-interglacial cycles in the Milankovitch band (~100 kyrs) is crucial to achieve a robust evaluation of possible environmental response to future climate-change scenarios. In this work, we document the long-term bio-sedimentary record of core 204 S16 (~205 m long), which covers a wide portion of the post-MPR (Mid-Pleistocene Revolution) interval, taking advantage of the highly subsiding context of the SE Po Plain (NE Italy). Detailed facies characterization through an integrated sedimentological and meiofauna (benthic foraminifers and ostracods) approach allowed for the identification of a repetitive pattern of alluvial deposits alternating with four fossiliferous, paralic to shallow-marine units (Units 1–4). The transgressive surfaces identified at the base of these units mark major flooding events, forced by Holocene (Unit 4), Late Pleistocene (Unit 3) and Middle Pleistocene (Units 1, 2) interglacials. Distinct stratigraphic patterns typify the Middle Pleistocene interval, which includes coastal-marine (tidal inlet and bay) deposits. In contrast, lagoonal sediments record the maximum marine influence in the Late Pleistocene-Holocene succession. As a whole, the meiofauna tracks a regressive trend, with the deepest conditions recorded by the oldest Unit 1 (MIS 9/11 age?).

scholarly journals Comparative morphology of the spleen of birds of the families phasianidae and columbidae

2020 ◽  
Vol 93 (8) ◽  
pp. 164-170
Author(s):  
L. Horalskyi ◽  
◽  
N. Kolesnik ◽  
I. Sokulskyi ◽  
I. Horalska ◽  
...  
Keyword(s):  
Musculoskeletal System ◽  
Lymphoid Tissue ◽  
Morphological Study ◽  
Morphological Structure ◽  
Comparative Morphology ◽  
White Pulp ◽  
Morphometric Features ◽  
Hematoxylin And Eosin ◽  
Lymphoid Nodules ◽  
Red Pulp

Morphological study of the phylogenetic direction allows to determine the ecological conditionality in the nature of the development of related forms and deepens their characteristics. The work aimed to study the spleen of birds of the Phasianidae family (chicken, quail) and Columbidae (pigeon). The histological preparations were stained with hematoxylin and eosin. Their morphometry was performed for establishing the features of the morphological structure of the organ. The microscopic structure of the spleen in birds of the pheasant and pigeon classes was characterized by the presence of the same components: stroma and parenchyma. The musculoskeletal system consisted of trabeculae and capsules. The pulp was divided into white and red. However, each species of bird had its own histological and morphometric features. The pulpal trabeculae were found only in chickens. The capsular trabeculae were also present in quails and pigeons. A characteristic feature of the pigeon's spleen is the association of the connecting trabeculae with the vascular ones, in which a large number of vessels were located. The lymphoid tissue of the spleen of birds was predominantly structured. However, in the pigeon's spleen, there was also unformed lymphoid tissue of varying size of various shapes. The white pulp of birds consisted of lymphoid nodules and periarterial lymphoid sheaths. Additionally, ellipsoids were found in the white pulp of the hens' spleen, and they were almost non-existent in pigeons. In pigeons, lymphoid nodules were mainly located in the subcapsular zone of the spleen and often formed conglomerated structures by merging 3–6 nodules. The musculoskeletal system is best developed in pigeons (9 %). The relative area of white pulp is the largest in chickens (18.6 %), red pulp – in quail (82 %).In this work, we have taken the first step in elucidating the features of the morphology of the spleen of birds of different classes, for detailed analysis, our further research will focus on the study of morphophysiology of the spleen of birds in age and breed aspects.

Alluvial deposits evolution in the Inaouene river valley (Morocco) during late Pleistocene and Holocene epoch.

2021 ◽  
Author(s):  
Mohammed Lghamour ◽  
Lhoucine Karrat ◽  
Vincenzo Picotti ◽  
Irka Hajdas ◽  
Negar Haghipour ◽  
...  
Keyword(s):  
Organic Matter ◽  
Late Pleistocene ◽  
Ion Source ◽  
River Valley ◽  
Middle Pleistocene ◽  
Annual Rainfall ◽  
Carbonate Content ◽  
Alluvial Deposits ◽  
Homogeneous Surface ◽  
Middle Atlas

<p>      The Inaouène wadi is a river located in the northern region of Morocco. Its catchment area covers about 5124 km² with an average altitude of 800 m. The tributaries drain the marly reliefs of the Prerif in the northern side, as well as its southern ones are crossing the liasic carbonate and the Paleozoic crystalline rocks of the last Middle Atlas foothills. This region is characterised by a semi-arid Mediterranean climate influenced by the ocean oscillations, the average annual rainfall records 600 mm with a very significant spatial and interannual irregularity.</p><p>Along the major part of its flow, the Inaouène river has cut its bed between the Prerif and the Middle Atlas belts, by following the foreland corridor that separates them. From a pass (Touaher) that marks the corridor closing, the river valley widens from East to West, forming an alluvial plain with a maximum width of 5 km incised by a meandering and highly sinuous stream.</p><p>      Alluvial deposits in this valley are more developed on the Atlas side than at the Prerif foot; At least five levels representing the vestiges of the Lower and Middle Pleistocene terraces are present in the landscape.</p><p>More recent deposits occupy the valley floor, they constitute a more homogeneous surface showing low terraces abrupts and lateral limits between different sedimentary units. These alluvial deposits correspond to the terminal Pleistocene, middle and upper Holocene epoch. About 30 samples of charcoal and TOC have been selected and analysed using the  AMS 14C dating. Due to the scarcity of organic matter, some of the samples contained less than 0.1 mg of carbon and had to be analysed using the gas ion source (GIS) interface of the MICADAS (Haghipour et al., 2019; Wacker et al.,2013). 12 sections were described in the field and of which 8 sections were analysed regarding grain size, mineralogical composition, carbonate content as well as organic matter in soils and sediments.</p><p>      The analysis results indicate that the late Pleistocene is characterised by a high fluvial activity reflected by the development of braided system river and so coarse material, while fine deposits of floodplains are more abundant during the Holocene.</p><p>……...........</p><p><strong>Haghipour, N., Ausin, B., Usman, M. O., Ishikawa, N., Wacker, L., Welte, C., Ueda, K., and Eglinton, T. I., 2019, Compound-Specific Radiocarbon Analysis by Elemental Analyzer-Accelerator Mass Spectrometry: Precision and Limitations: Analytical Chemistry, v. 91, no. 3, p. 2042-2049.</strong></p><p><strong>Wacker, L., Fahrni, S., Hajdas, I., Molnar, M., Synal, H., Szidat, S., and Zhang, Y., 2013, A versatile gas interface for routine radiocarbon analysis with a gas ion source: Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms, v. 294, p. 315-319.</strong></p>

The northern segment of the Têt Fault (Pyrenees-Orientales) : Neogene evolution and geomorphic implications

2004 ◽  
Vol 175 (3) ◽  
pp. 257-272 ◽  
Author(s):  
Bernard Delcaillau ◽  
Jean-Michel Carozza ◽  
Marianne Font
Keyword(s):  
Structural Data ◽  
Fault Scarp ◽  
Strike Slip ◽  
Middle Pleistocene ◽  
Tectonic Deformation ◽  
Drainage Pattern ◽  
Alluvial Deposits ◽  
Plan View ◽  
Hypsometric Integral ◽  
Northern Segment

Abstract In intraplate areas, low tectonic deformation frequently resembles denudational processes. Fault scarps are eroded and buried by Quaternary alluvial deposits. The eastern termination of the Pyrenean orogenic belt displays a moderate tectonic and seismic deformation. In the northern segment of the Tet fault (F.T.N.), geomorphic systems are analysed with intent to detect the various response of landforms and drainage pattern to recent tectonics. We used topography, structural data, drainage pattern and sedimentological syntectonic deposits which determine the evolution of the fault scarp since the Pliocene. The F.T.N., trending N080 to 050oE, is about 30 km long. The fault, separating the Pliocene sequences in the hanging wall and granite in the footwall, is emergent along the scarp. The change in fault orientation along strike gives the fault zone a “dog-leg” pattern in plan view (fig. 1 and 2). Structural data indicate that the faults are steeply dipping (> 60o). The stratigraphy of the study area can be divided up into three main depositional units, bounded above and below by sequence boundaries (fig. 6 and 7). The lithofacies of the Pliocene deposits is composed of coarser conglomerate, sandstones and silts. Most of the sediments exposed in the sections were deposited by braided rivers. Palaeocurrent data indicate a dominant SW-NE directed palaeoflow, although there are also a range of lateral flow directions. Proximal breccias provide evidence for the degradation of the fault scarp (fig. 7b). In westward direction, the offset of middle Pliocene level shows a differential uplift from 150 to 300 m. In several places, the fault is covered by middle Pleistocene terrace deposits that are not apparently affected. The activity of the Têt fault and transversal faults is thus probably lower to upper Pliocene age. The geomorphological indices are useful tools in the evaluation of neotectonics. One of the major features of the relief is the fresh and immature aspect of the fault scarp. They are characterized by a sharp contact between sediments and basement, a low sinuosity index and two triangular spurs. Some statistical properties of landscape (relief, hydrographic network geometry, hypsometric integral ...) may be dominated by the influence of tectonic processes [Merrits and Vincent, 1989 ; Lucazeau and Hurtrez, 1997 ; Font, 2002]. These geomorphic parameters can provide quantitative estimates of surface displacements. But the factors other than tectonics (climate, glacioeustatism and lithology) control morphometric properties. In our study, we used topography, drainage pattern and structural data to perform quantitative morphometric analysis on the basis of field investigation and digital elevation model processed with Arcview V.3.1. The geomorphic indices of drainage basins (area, length, basin relief, slope...), physiographic of the drainage network and degree of topographic dissection of the fault scarp provide information to analyse the timing of the landscape development (tables I & II, fig. 12). Hypsometry has been determined both for basins and selected lithologies within these basins. Hypsometric analysis is performed to summarize the form and evolution of drainage pattern (fig. 10). This F.T.N. is the surface expression of vertical movement located along the strike-slip fault with a normal component. The fault scarp is characterized by three segments which have different morphogenic comportements : the western segmented scarp is poorly exhumed and steeped, the central and eastern scarps are highly eroded and present a poorly geomorphic expression. In the western area, steeper topography accompanied by breaks in the slope along transverse profiles seem to correspond to the trace of recent uplift. Triangular shaped analysis, procured by degradation of the fault scarp, is a geomorphic indicator of neotectonics [Delcaillau, 2001]. Lateral propagation of the deformation and rapid valley incision in the Pliocene formation and the granite of the Millas block are the main factors of the geomorphological evolution of the fault scarp. Divergent-oblique stress leads to the development of strike slip main faults, normal faults and transtensional subbasins. The Conflent basin is in a pull-apart that was initiated during the Pliocene. The elements of the basin fill are underlain by local syndepositional relief, such as fault-flank conglomeratic wedges and evidence of syndepositional tectonism including intraformational fault and roll-overs (fig. 6c).

scholarly journals Evolution of the Bystrzyca River valley during Middle Pleistocene Interglacial (Sudetic Foreland, south-western Poland)

2020 ◽  
Vol 12 (1) ◽  
pp. 1679-1703
Author(s):  
Dariusz Krzyszkowski ◽  
Lucyna Wachecka-Kotkowska ◽  
Marcin Krawczyk
Keyword(s):  
Distal Part ◽  
System Development ◽  
River System ◽  
River Valley ◽  
Oxbow Lake ◽  
Middle Pleistocene ◽  
Alluvial Deposits ◽  
The North ◽  
Study Results ◽  
Tectonic Movements

AbstractThe article depicts the problem of river system development during the Middle Pleistocene Interglacial in the Bystrzyca River Valley (Sudetic Foreland, south-western Poland). Ten research sites located within the Świdnica Plain are presented, in which the structural, grain size (granulometry), petrographic, quartz grain morphoscopy, and heavy mineral analyses were carried out. The study results show the formation of piedmont fan deposits 2–8 km to the NE of the Sudetic Marginal Fault. The location of the fluvial deposits between the Sanian and Odranian tills indicates that they were deposited during the Holsteinian Interglacial (Krzczonów Formation, Mazovian; see Table 1). According toxthe lithofacies analysis, vast alluvial plains, composed of angular gravel grains in the south and of sands in the north, were deposited in the Sudetic Foreland in the environment of a very dynamic river. They are covered with a discontinuous layer of Odranian till. The petrographic spectrum shows 90–99% of local rocks, namely, Sudetic porphyry, Sowie Mts Gneiss and milky quartz, and 1–10% of Scandinavian rocks. In the proto-Bystrzyca river system, the existence of an oxbow lake in the distal part of the Krzczonów fan has been proved, which was developing at the end of the Holsteinian Interglacial. The continuity of the alluvial deposits is interrupted in the vicinity of Świdnica due to both the tectonic movements and the formation of the narrow tectonic graben of Roztoka–Mokrzeszów.

scholarly journals Quaternary alluvial fan systems of the Agri intermontane basin (southern Italy): tectonic and climatic controls

2011 ◽  
Vol 62 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Salvatore Giano
Keyword(s):  
Southern Italy ◽  
Alluvial Fan ◽  
Coarse Grained ◽  
Middle Pleistocene ◽  
Normal Faults ◽  
Tectonic Deformation ◽  
Alluvial Deposits ◽  
Plan View ◽  
Intermontane Basin ◽  
Eastern Margin

Quaternary alluvial fan systems of the Agri intermontane basin (southern Italy): tectonic and climatic controls The Agri River high valley is a Quaternary intermontane basin located in southern Italy. The tectonic evolution of this basin was controlled by Lower Pleistocene strike-slip master faults, subsequently reactivated as normal faults until the Middle Pleistocene. The Quaternary sediments of the basin infill are mainly constituted of continental clastics, represented by coarse-grained alluvial deposits divided by unconformities. The arrangement of clastic deposits suggests that the Pleistocene to Holocene alluvial fan system developed along the eastern margin of the valley. Five generations of slope and alluvial fan systems have been recognized in the Agri basin. The oldest fans have formed on both slope and alluvial deposits. The younger alluvial fans are located along the entire valley floor and arose upon the earlier fan apexes originating in these valleys. The youngest fans are arranged in two different generations and show proximal facies distributed along the foot slopes. Plan view morphology, fan slope profiles, and sedimentary features of the fan system have been used here to determine the magnitude of the tectonic deformation episode affecting the faulted mountainous front of the Agri basin eastern margin. Both fast and slow tectonic episodes occurred during the different regional Quaternary tectonic stages that affected the southern Apennine chain. These tectonic episodes have therefore been analysed in relation to climatic conditions in order to determine their contributions to the evolution of the Pleistocene to Holocene fan systems.

scholarly journals Concerning the Microdiamonds and Cosmic Spherules from Middle Pleistocene Selenge River Basin in North Mongolia

2017 ◽  
Vol 1 (1) ◽  
Keyword(s):  
River Basin ◽  
Practical Interest ◽  
Flood Plain ◽  
Middle Pleistocene ◽  
Alluvial Deposits ◽  
The North ◽  
River Terraces ◽  
Cosmic Spherules ◽  
Alluvial Terraces ◽  
North And South

This paper concerns deals with new discovery of microdiamonds and cosmic spherules from Middle Pleistocene Selenge river basin by the example of the Teel and Khukh Ereg terrace alluvial terraces. The Teel and Khukh Ereg alluvial terraces are located at the north and south edges of the Selenge river (Fig.1), at the base of mountain Namnan uul (Fig.2). These terraces are those whose cusp and bench entirely composed of alluvial sediments of Middle Pleistocene age [1]. This indicates that the Selenge river has a long history of development, had time to develop a flood plain and to deposit alluvium, through which it cut subsequently and north and south behind as a Teel and Khukh Ereg terraces [2]. Alluvium studies may be of great practical interest because in some areas, river terraces are veritable treasure-troves of economic minerals. With river terraces are associated most placer deposits of such important economic minerals as gold, platinum, diamond, etc. Numerous engineering projects, an example, bridges (Kherlen, Tuul, Selenge, Orkhon, Baidrag, Tui, Zavkhan, Delger Muren, etc.), dams and hydropower plants (Durgun Nuur, Ulaan Boom) are built on alluvial deposits. Hence the need to know all the essential features of the geostructure of river terraces. Just our investigation of the Selenge river terraces in 2006-2010 and 2014 gave possibility to discover the placer diamonds within the Teel and Khukh Ereg alluvial terraces for the first time in Mongolia [3,4].

scholarly journals Changes in the morphological structure of giant prolactinoma during treatment with cabergoline

2020 ◽  
Vol 66 (3) ◽  
pp. 15-21
Author(s):  
Ludmila I. Astafyeva ◽  
Lyudmila V. Shishkina ◽  
Boris A. Kadashev ◽  
Pavel L. Kalinin ◽  
Julia G. Sidneva ◽  
...  
Keyword(s):  
Morphological Study ◽  
Tumor Regression ◽  
Morphological Structure ◽  
Human Tumor ◽  
Residual Tumor ◽  
Labeling Index ◽  
Ki 67 ◽  
Giant Prolactinoma ◽  
Subtotal Removal

Currently, cabergoline therapy is the main method of treatment with prolactin. The use of the drug in most cases leads to tumor regression, normalization of prolactin levels and restoration of gonadotropic function. The mechanism of its impact on tumor cells in vivo, which is dynamically traced in the same human tumor, is the case of considerable interest. We observed a 30-year-old patient who was operated on twice for a giant prolactinoma before and on treatment by cabergoline. The morphological study after the first surgery (before introducing of cabergoline therapy) revealed a prolactin-positive pituitary tumor with a Ki-67 labeling index of 8% and with strong expression of dopamine type 2 receptors (D2R), CD31 and CD34. After 4 months, during which the patient received cabergoline at a dose starting from 0.5 mg to 1.5 mg per week, a second transsphenoidal surgery was performed with subtotal removal of residual tumor tissue. During the morphological study of the second biopsy sample, the tumor retained a pronounced immunopositivity to prolactin and D2R, with a decrease in the labeling index Ki-67 to 2%, as well as a decrease in the expression of CD31 and CD34. Subsequent cabergoline therapyresulted in persistent normoprolactinemia, restoration of androgen (and reproductive) status, and no tumor recurrence over a 10-year period on cabergoline treatment. Thus, one of the mechanisms of effect of cabergoline that leads to tumor regression is a decrease in the proliferative index and angiogenesis of the tumor.

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