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Wyświetlanie 1-15 z 241
Tytuł:
A new species of Hystrix (Rodentia: Hystricidae) from the Pliocene site of Węże 1 in southern Poland
Autorzy:
Czernielewski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/24024715.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Pliocene
rodents
porcupines
Węże
karst
pliocen
gryzonie
węże
kras
Opis:
The specific name velunensis is established to encompass porcupine remains (Hystrix Linnæus, 1758) recovered from the Pliocene site of Węże 1 in southern Poland. The studied specimen was previously assigned either to H. primigenia (Wagner, 1848) or H. depereti Sen, 2001, however it can be distinguished from these species and other fossil Hystricidae by its distinct occlusal morphology, most importantly the presence of an anterolingual flexus dissecting the anteroloph of P4. Hystrix velunensis sp. nov. was probably closely related to H. primigenia and H. depereti. A previously undescribed specimen from the nearby site of Węże 2 most probably belongs to H. refossa Gervais, 1852b, which would be the first known occurrence of this species in Poland.
Źródło:
Acta Geologica Polonica; 2023, 73, 1; 73--83
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion of carbonate speleothems by an allogenic river inferred from petrography and a weight loss experiment : a case study from the Demänová Cave System, Slovakia
Autorzy:
Sala, Przemysław
Bella, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/27311293.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Karst
carbonates
hiatus
dissolution
palaeoenvironment
Opis:
The crystallization of speleothems can be interrupted by the invasion of allogenic water into cave passages. These interruptions were studied, both in speleothems currently submerged in an underground river and in speleothem sections, which were found at the lowermost fluvially active passage level of the Demänová Cave System. The interaction between speleothems and allogenic water, undersaturated with respect to calcite, is manifested in the presence of siliciclastic material and the corrosion of calcite crystals. The progressive development of corrosion features depends on the duration of the interaction of calcite crystals with allogenic water. Moreover, the movement of the water and siliciclastic deposition over the speleothems can influence the corrosion process. The estimated rate of corrosion, caused by the underground Demänovka River and measured by the weight loss of experimental tablets, is up to 0.029 mm/y. U-series dating indicated that the interaction of speleothems with allogenic water occurred during the Vistulian (Weichselian). The identification of corrosion episodes, caused by allogenic water, is a step towards understanding the origin of hiatuses and establishing criteria for recognition of them.
Źródło:
Annales Societatis Geologorum Poloniae; 2023, 93, 4; 467--481
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potencjał geoturystyczny wybranych obiektów Ojcowskiego Parku Narodowego i jego otuliny
Geotouristic potential of selected objects in the Ojców National Park and its protected zone area (S Poland)
Autorzy:
Dzięgiel, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/20204843.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geoturystyka
Oksford górnojurajski
skalisty wapień
kras
tuf wapienny
less
geotourism
Upper Jurassic Oxfordian rocky limestone
karst
calcareous tufa
loess
Opis:
In this paper, two scenic caves, five selected karst rock forms, and five rock outcrops situated in the Ojców National Park and its protected zone area are the subject of comparative research, considered as very essential examples of geotouristic potential. Most of their karst forms differ between each other. These include Łokietek and Ciemna (Dark) cave, Kraków Gate, Rękawica and Igła Deotymy rock-cliff at Ojców, Duży Pochylec rock-cliff in Skała, and Maczuga Herkulesa rocky tower at Pieskowa Skała. Apart from them, outcrops of Quaternary calcareous tufa and rock falls at Ojców, an abrasion surface cutting Upper Jurassic limestones and covered with Cretaceous limestones and marls, Pleistocene loess at Januszowice, and the Duże Skałki (Big Rocks) former quarry of Upper Jurassic limestone at Czajowice were also studied. All of them are situated in the Silesian-Kraków Monocline. The caves, rock-cliffs and Maczuga Herkulesa rocky tower developed in the Upper Jurassic Oxfordian massive limestone. Their karst forms are diverse and picturesque. The other objects selected for research are also very interesting and important examples, displaying products of very complex geological processes. The comparative geotouristic potential evaluation of all 12 objects was made to meet tourists', educators' and investors' expectations and needs to increase their geotouristic development level. The statistical data of the annual number of visitors at the described two caves is also discussed. In general, interest in them as geotouristic abiotic nature objects has been growing regularly until today. They have become very widely known in Poland. Moreover, the Łokietek Cave, Kraków Gate rock-cliff and Maczuga Herkulesa rocky tower have become very popular worldwide.
Źródło:
Przegląd Geologiczny; 2023, 71, 3; 113-131
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of tectonic setting on groundwater chemical composition in the Peshkopi gypsum karst area, Korab Mountains, Eastern Albania
Autorzy:
Eftimi, Romeo
Andreychouk, Viacheslav
Niedoba, Tomasz
Różkowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/31342964.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gypsum karst
groundwater shallow
deep circulation systems
water chemical composition
thermal springs
Albania
Opis:
The diversity of groundwater chemistry in the Peshkopi gypsum karst area may be related to its setting within the tectonically active Korab Massif (Albania), as shown by field tests of temperature, pH, Eh and EC, and sampling of the waters for chemical analysis (both major and trace components) from cool brackish springs and mineralized thermal springs. The relationship between the chemical composition of the spring waters and of the reservoir rocks was elucidated by analysis of anhydrite-gypsum rocks and experimental dissolution of an anhydrite-gypsum sample. Statistical analysis was used in the processing of hydrochemical data. Comparison of analytical results from 2019 with earlier data indicates compositional stability of the groundwaters over time. Our results together with statistical analysis of the hydrochemical data support an earlier hypothesis of two systems of groundwater circulation within the anhydrite-gypsum deposits of the Peshkopi region. A shallow circulation system involves cold (10-14°C), mainly brackish SO4-Ca waters with very low concentrations of Na+ and Cl- ions, reflecting their formation in a sulphate rock environment that probably corresponds spatially with a gypsum layer formed by hydration of anhydrite in the near-surface zone. A deep circulation system conditioned, inter alia, by the presence of a large fault, brings to the surface water at up to 44°C, saturated with H2S, mineralized, of the SO4-Ca type with an increased content of Na, K, HCO3, Cl, BO3 and SiO2>/sub>. The chemical composition of these waters, regardless of the presence of large amounts of sulphates, is significantly different and suggests the influence of other factors on their formation, such as slow circulation, contact with flysch rocks in the fault zone and the mixing of deep and near-surface waters in the final part of their ascent to the surface.
Źródło:
Geological Quarterly; 2023, 67, 2; art. no. 19
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of malacological analysis to reconstruction of regional and local environmental changes : the Cisowa Skała locality (the Carpathians, southern Poland)
Autorzy:
Skoczylas-Śniaz, Sylwia
Alexandrowicz, Witold Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2127367.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
karst sediments
molluscs
environmental changes
Holocene
Podhale Basin
Pieniny Klippen Belt
Opis:
An isolated limestone hill (Cisowa Skała), located in the Podhale Basin in southern Poland, has yielded mollusc shells and small vertebrate bones in deposits filling small karst forms such as rock shelters, characteristic molluscan assemblages can be identified, the succession of which reflects changes in the environment and also microhabitat variations depending on local factors, such as slope exposure and type of vegetation. These local factors markedly affect regional environmental trends determined primarily by climate change and, during the last several hundred years, also by human activity. Such malacological analysis enables effective palaeogeographical reconstructions, both on the scale of geographical regions and for microhabitats.
Źródło:
Geological Quarterly; 2022, 66, 1; art. no. 5
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Castoridae (Rodentia) from the Villafranchian site of Węże 2 in southern Poland
Autorzy:
Czernielewski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2185979.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Villafranchian
rodents
beavers
Węże
karst
Opis:
Several isolated teeth and jaw fragments of beavers (Rodentia: Castoridae), discovered at the Villafranchian (MN 16b?) site of Węże 2 in southern Poland, are attributable to two species: Dipoides ex gr. problematicus-sigmodus and Trogontherium (Euroxenomys) minus. The genus Dipoides and the species Trogontherium (Euroxenomys) minus have not previously been reported from Poland. Their presence at the Węże 2 site suggests that these lesser-known and extinct representatives of the Castoridae were adapted to similar conditions as the modern species (Castor fiber and C. canadensis).
Źródło:
Geological Quarterly; 2022, 66, 2; art. no. 18
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exogenous seed treatment with proline and its consequences to Norway spruce (Picea abies (L.) H. Karst) seedling establishment
Autorzy:
Kijowska-Oberc, J.
Wawrzyniak, M.K.
Staszak, A.M.
Ratajczak, E.
Powiązania:
https://bibliotekanauki.pl/articles/2130182.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
proline
seed treatment
Norway spruce
seedlings development
tree seeds
oxidative stress
Opis:
Accumulation of proline is a defense mechanism against external stress conditions, preventing damage to the structure and function of cells and improving plant development processes, such as germination. The purpose of this study was to investigate proline treatment as a means of improving the germination and development of Norway spruce seedlings. The effect of exogenous proline has been studied in three stages of initial plant development. The collected seeds were soaked in water or 8 mM proline solution and placed on the germinators. The germination capacity and the mean germination time were determined. Seedlings with radicles >10 mm were transferred to the sand-peat substrate at a constant temperature of 20 °C. Seedlings at 3 subsequent developmental stages (S1 – germinated seeds with radicles > 3 mm; S2 – seedlings with radicles >10 mm; S3 – established seedlings grown for 90 days) were examined for the oxygen consumption rate, total antioxidant capacity, hydrogen peroxide level, malondialdehyde level and intracellular proline content. Proline treatment was conducive to lowering the levels of hydrogen peroxide and malondialdehyde at stage S1. At the subsequent stages of development, the levels of hydrogen peroxide and malondialdehyde increased, and at the S3 stage, there was also a marked increase in total antioxidant capacity. At stage S3, the seedlings of the proline treatment were characterized by a lower total mass, and the response to exogenous proline was stronger in the root tissues than in the leaves. The oxygen consumption rate was higher for the proline treatment at all stages of development. Seedlings at the analyzed stages of establishment differed in response to proline treatment. Exogenous proline had some beneficial effects during the first phase of germination by reducing the level of hydrogen peroxide and improving the condition of lipid membranes. In the subsequent stages of seedling development, in response to the same concentration of proline solution, undesirable effects, such as an increase in hydrogen peroxide levels and damage to cytoplasmic membranes, were observed. Optimal concentrations of exogenous proline should be determined prior to commercial use of proline treatment to improve plant stress tolerance.
Źródło:
Dendrobiology; 2022, 87; 149-162
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Karst relief of the Mali me Gropa Massif, central Albania
Autorzy:
Andreychouk, Viacheslav
Eftimi, Romeo
Nita, Jerzy
Klimchouk, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/2127365.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
karst geomorphology
mountain karst
central Albania
Mali me Gropa massif
Opis:
The mid-altitude mountain massif of Mali me Gropa is located in the central part of Albania, rises to an altitude of 1500–1800 m a.s.l., is composed mostly of Mesozoic limestone, and is characterized by extensive surface karst development. The karst relief is dominated by “doline” morphology including “polygonal” karst. Detailed geomorphological analysis of the western part of the Mali me Gropa massif (so-called Western Massif) by means of GIS methods is used to determine and explain the morphometric and morphological diversity of the area’s topography. Based on a homogeneity criterion, a number of geomorphological units with specific kinds of karst relief have been distinguished within the massif. The differences in karst sculpture concern the size (diameter) of dolines and depressions, their depth, shape and symmetry, orientation, density of occurrence and spatial pattern, which provide the basis for distinguishing geomorphological units. The spatial differentiation of the karst relief is explained by the influence of factors which are evolutionary (geological and geomorphological evolution of the massif), hypsometric (altitude difference of terrains) and geomorphologic-structural (inclination of the slopes and layers). The relatively poor expression of open karst conduits (i.e. caves and vertical shafts) on the surface of the massif may result from the relative immaturity of the epikarst zone, the widespread occurrence of residual cover on the plateau, and the accumulation of large amounts of clay material in dolines and depressions. Detailed hydrogeological studies show, however, high karst permeability and dominance of conduit flow. Considering the high geomorphological landscape and ecological value of the area, it should be granted the status of a nature reserve or national park. Geomorphological and karstological research within the massif should be continued as it represents a type of karst found also in other parts of Albania. This type of karst area is of great economic (groundwater reserves) and natural protection (environmental) importance.
Źródło:
Geological Quarterly; 2022, 66, 1; art. no. 6
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of the 2D/3D electrical resistivity tomography (ERT) method in investigating the carbonate karst of the Zakrzówek Horst
Autorzy:
Pasierb, Bernadetta
Powiązania:
https://bibliotekanauki.pl/articles/2172908.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
2D/3D ERT methods
karst structures
Zakrzówek Horst
Jasna Cave
Opis:
A characteristic features of the geological structure of the Krakow area are tectonic horsts and grabens. The Zakrzówek Horst is one of the seven horst structures within the Krakow area, located in the south-western part of the area. It is built of Upper Jurassic limestones, where numerous karst caves have been developed. The caves of the Zakrzówek Horst probably form a system of interconnected caves. This hypothesis has been tested in the western region of the Zakrzówek Horst using the electrical resistivity tomography (ERT) method. The investigations were conducted in the parallel profile configuration as well as with the data processing procedure based on the 2D and 3D inversion. The results of these studies are an attempt to locate additional voids as well as fractured zones in carbonate rock mass. The studies confirmed the hypothesis that the Jasna Cave is probably only a fragment of a vast cave system developed within the Zakrzówek Horst. As a result of the research carried out with the ERT method, the most prospective directions for future speleological research have been determined.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 3; 319--327
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The karst landscapes of Beni Mellal Atlas (central Morocco): identification for promoting geoconservation and tourism
Autorzy:
Barka, Abdellah Ait
Rais, Jamila
Barakat, Ahmed
Louz, Elhassan
Nadem, Samir
Powiązania:
https://bibliotekanauki.pl/articles/15804900.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
karst landscapes
geo-tourism
Central High Atlas
Atlas of Beni Mellal
Opis:
The Atlas of Beni Mellal is located in the Moroccan central High Atlas, characterized by an important geo-di-versity that attracts tourists every year. However, the number of visitors remains limited due to the lack of the promo-tion means, enhancement and mediation of this heritage. The obtained data indicate that the studied area preserves a great number of karst geosites, such as ruiniform landscapes, caves, poljes, sinkholes, Karren, shaft cave and many remarkable reliefs such as canyons and cliffs. This work concerns the inventory, the quantitative evaluation and the en-hancement of the remarkable geomorphosites. The results reveal the presence of 21 sites, including six karst forms; five ruiniform landscapes and one karren form, one enviable panoramic viewpoint and five karst springs, four caves, two travertines, two waterfalls, and one structural relief geosite; canyon, and one tepee structures. However, these sites are not protected against all types of degradation, because the general public does not recognize them. These karst forms are very vulnerable, they cannot reproduce quickly, and their deterioration leads to their permanent disappearance. That is why this heritage must be the object of a particular attention of the whole community. The valorisation of these geomorphologic assets is the proposal of a number of circuits and geotourist routes from the perspective of local and integrated development.
Źródło:
Quaestiones Geographicae; 2022, 41, 3; 87-109
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Subaquatic Springs in the Formation of Flow, Temperature and Chemical Composition of River Water in the Reserve
Autorzy:
Vaganov, Sergey
Blinov, Sergey
Belkin, Pavel
Perevoshchikov, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2068457.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
karst
groundwater
surface water
subaquatic spring
chemical composition
river flow formation
temperature regime
nature reserve
Opis:
A study of the effect of subaquatic discharge of karst groundwater sources on the composition of the Vishera River, the largest tributary of the Kama River, was carried out. The study was carried out on the territory of the State Nature Reserve "Vishersky" and included the determination of the flow rate, temperature as well as chemical composition of natural waters. Six zones of karst groundwater discharge and their influence on the water regime of the Vishera river were studied in detail. It was shown that subaquatic sources in the places of their discharge, forming up to 36% of the river flow, significantly affect the temperature regime. A significant part of dissolved substances, primarily calcium ions and hydrocarbonate ions, as well as some trace elements (Li, Sr, V, Cr) enter the Vishery river with karst waters. The results of the study show that monitoring the composition and properties of groundwater discharged covertly in the river channel is an important part of the monitoring of water bodies of both protected and developed areas.
Źródło:
Journal of Ecological Engineering; 2022, 23, 3; 39--48
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Ras El Ma Karst Spring Features by Structural and Functional Approaches at the Region of Taza, Morocco
Autorzy:
Naoura, Jamal
El Kati, Imad
Benaabidate, Lahcen
Powiązania:
https://bibliotekanauki.pl/articles/1955574.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
karst aquifer
hydrogeological functioning
Ras El Ma spring
model of Mangin
Morocco
Opis:
This work performed by considering two complementary approaches for investigating the Karst system of Ras El Ma source: (1) The structural approach based on field studies, (2) The functional approach requiring inputs data (precipitations) as well as output data at the exit of the karstic system. The choice of the Ras El Ma source is justified by the fact that it constitutes the main outlet of the Liassic aquifer at the Southwest of Taza town. The structural approach highlighted that the impact of South Rifan and North Middle Atlas faults, oriented mainly NE-SW to ENE-WSW and NW-SE, tectonically linked to the Hercynian and late-Hercynian phases; these faults compartmentalized the karst into panels. The functioning of this karst system is based on the coupling of inputs and outputs, the analysis of interannual hydrograph, flood hydrographs, the recession curves and the analysis of hydrogeochemical results. Respectively, the obtained results are presented as follows: A close relationship between flow rates and precipitation, interannual hydrographs marked by a contrasting variation in flow rates and a periodicity that occurs between low water and high-water years. Concerning flood hydrographs, there are two types, a unit modal hydrographs type which generally occurs following time concentrated rainfall and a second multi modal hydrographs type which follows the repetitive rainfall in the basin. The study of recession curves reveals a clear complexity of the systems supplying the source. However, due to the low drying-off coefficients (7.66∙10-4), the aquifer seems to have a poorly developed drainage network in a flooded area. According to the Mangin method [1975], this karstic system is classified in the category of poor or complex karst systems taking into accounts two parameters (i) and (K), which characterize the functioning of the infiltration zone and the volume of flooded karst, respectively. The physicochemical parameters study highlighted the nature of drained rock by the sources. The correlation between conductivity and different chemical elements shows that bicarbonates and calcium are responsible for the mineralization of the waters of this source. It can be concluded that the low values of mineralization occur during the winter and spring floods. The spring regains its normal mineralization during the summer period.
Źródło:
Journal of Ecological Engineering; 2021, 22, 9; 32-47
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bedrock characteristics of selected covered karst sites in the Małopolska Upland
Autorzy:
Brzozowicz, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/2037021.pdf
Data publikacji:
2021-12-23
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
karst landform
Mesozoic surface
digital terrain model
undrained depressions
Opis:
The article describes the nature of the bedrock in areas in the Małopolska Upland where landforms associated with covered karst processes occur. It seeks to find a relationship between geological structure and the potential for covered karst processes to develop. To this end, it includes a review of the literature on the geological structure of three areas in the mesoregions of Wzgór-za Opoczyńskie, Niecka Włoszczowska and Niecka Solecka. Two of the three sites are located in an area of limestone karst, and the third (located in Niecka Solecka) is an area of gypsum karst. All three sites were filled with sediment in the Holocene, but the forms being studied probably formed much earlier. The author also attempts to reconstruct the relief of the Mesozoic surface as digital terrain models. For this purpose, data was taken from geological drillings contained in geological maps of Poland and developed using GIS software. According to digital terrain models in the form of 3D views all three investigated sites are locat-ed in a depressions in the Mesozoic surface (on the slopes or bottom of the basin). That location and low thickness of impervi-ous deposits has caused that migration of underground water, which can affect karstified rocks with increased intensity.
Źródło:
Acta Geographica Lodziensia; 2021, 111; 7-17
0065-1249
Pojawia się w:
Acta Geographica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomorphology and hydrogeology of an exposed evaporite dome: the Dumre karst area, Central Albania
Autorzy:
Andreychouk, Viacheslav
Eftimi, Romeo
Nita, Jerzy
Klimchouk, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/2058685.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Albania
gypsum karst
Dumre area
chemical denudation
Opis:
The Dumre area, located in Central Albania, is distinguished by a landscape whose main features consist of low altitude, mosaic and irregular relief, and the presence of a large number of depressions with lakes. These features result from karst development related to the presence of a tectonically affected dome of Triassic evaporite rocks, mainly gypsum. Gypsum karstification has operated since the Pliocene, and the present-day geomorphological appearance of the area indicates an advanced, mature stage of karst development. Signs of this maturity include the widespread occurrence of large depressions, many of which are water-filled, forming lakes, the occasional presence of gypsum hills in the form of monadnocks, a thick “coating” of residual sediments largely isolating the karstic gypsum substrate from precipitation and surface waters, and the fragmentary pattern of a degraded river network. The karst character of the relief is largely “camouflaged” by clastic terrigenous and residual deposits of considerable thickness which cover the gypsum and form a caprock. At the present stage, the caprock is being strongly reshaped and eroded. Chemical analyses show a mean dissolved gypsum content of 1.9 g/l and mean dissolved NaCl content of 0.4 g/l. The mean flow rate of subaqueous springs is calculated as 1.84 m3. The density of gypsum is 2.3, and that of rock salt is 2.17, thus the total volume of gypsum dissolved each year is 47,420 m3 and of rock salt 10,680 m3, making a total volume of dissolved material released by the subaqueous springs in one year of 58,100 m3. This corresponds to a cubic void of side length 38.7 m.
Źródło:
Geological Quarterly; 2021, 65, 4; 139--157
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gliridae (Rodentia) from the Villafranchian site of Węże 2 in southern Poland
Autorzy:
Czernielewski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2058683.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Villafranchian
rodents
dormice
Węże
karst
Opis:
A fossil assemblage of dormice (Rodentia: Gliridae) was uncovered at the (Lower?) Villafranchian site of Węże 2 in southern Poland. Based on morphometric criteria, the diagnostic M1 and m1 speci mens are assignable to Glis mi nor and Glis sackdillingensis, two species which differ only in the dimensions of their cheek teeth. The presence of dormice at Węże 2 implies that the fossil assemblage of this site represents an at least partly wooded environment. The enamel structure in the glirids from Węże 2 is formed predomi nantly by radial enamel. A thin layer of lamellar enamel, occurring close to the enamel-dentine junction, may be present. Such a type of enamel structure is typical of the Myomorpha, the clade of rodents encompassing the Muroidea (the mouse-like rodents) and Gliridae.
Źródło:
Geological Quarterly; 2021, 65, 4; 28--39
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 241

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