Community news

Speleology in Kazakhstan

Shakalov on 04 Jul, 2018
Hello everyone!   I pleased to invite you to the official site of Central Asian Karstic-Speleological commission ("Kaspeko")   There, we regularly publish reports about our expeditions, articles and reports on speleotopics, lecture course for instructors, photos etc. ...

New publications on hypogene speleogenesis

Klimchouk on 26 Mar, 2012
Dear Colleagues, This is to draw your attention to several recent publications added to KarstBase, relevant to hypogenic karst/speleogenesis: Corrosion of limestone tablets in sulfidic ground-water: measurements and speleogenetic implications Galdenzi,

The deepest terrestrial animal

Klimchouk on 23 Feb, 2012
A recent publication of Spanish researchers describes the biology of Krubera Cave, including the deepest terrestrial animal ever found: Jordana, Rafael; Baquero, Enrique; Reboleira, Sofía and Sendra, Alberto. ...

Caves - landscapes without light

akop on 05 Feb, 2012
Exhibition dedicated to caves is taking place in the Vienna Natural History Museum   The exhibition at the Natural History Museum presents the surprising variety of caves and cave formations such as stalactites and various crystals. ...

Did you know?

That paleontology is the study of life in past geologic time, based fossil plants and animals and including phylogeny, their relationships to existing plants, animals, and environments, and the chronology of the earth's history [1].?

Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms

What is Karstbase?



Browse Speleogenesis Issues:

KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
See all featured articles
Featured articles from other Geoscience Journals
Karst environment, Culver D.C.
Mushroom Speleothems: Stromatolites That Formed in the Absence of Phototrophs, Bontognali, Tomaso R.R.; D’Angeli Ilenia M.; Tisato, Nicola; Vasconcelos, Crisogono; Bernasconi, Stefano M.; Gonzales, Esteban R. G.; De Waele, Jo
Calculating flux to predict future cave radon concentrations, Rowberry, Matt; Marti, Xavi; Frontera, Carlos; Van De Wiel, Marco; Briestensky, Milos
Microbial mediation of complex subterranean mineral structures, Tirato, Nicola; Torriano, Stefano F.F;, Monteux, Sylvain; Sauro, Francesco; De Waele, Jo; Lavagna, Maria Luisa; D’Angeli, Ilenia Maria; Chailloux, Daniel; Renda, Michel; Eglinton, Timothy I.; Bontognali, Tomaso Renzo Rezio
Evidence of a plate-wide tectonic pressure pulse provided by extensometric monitoring in the Balkan Mountains (Bulgaria), Briestensky, Milos; Rowberry, Matt; Stemberk, Josef; Stefanov, Petar; Vozar, Jozef; Sebela, Stanka; Petro, Lubomir; Bella, Pavel; Gaal, Ludovit; Ormukov, Cholponbek;
See all featured articles from other geoscience journals

Search in KarstBase

Your search for photographs (Keyword) returned 47 results for the whole karstbase:
Showing 1 to 15 of 47
Atlas of Sedimentary Rocks under the Microscope, 1984, Adams A. E. , Mackenzie W. S. , Guilford N

Early History of Yarrangobilly Caves, 1986, Bilton, Gary

To present my first ever paper to the first-ever seminar of spelean history in Australia is indeed a daunting, but challenging task. Present knowledge is scattered, to say the least, however it is my aim to present what is known from present resources with regard to the early history, and to reproduce some of the earliest photographs and maps of the area, some of which have never before been published. Hopefully this will provide impetus for a more systematic and detailed approach to future historical research on Yarrangobilly Caves. The history of the human occupation of Yarrangobilly Caves probably goes back thousands of years with increasing evidence of Aboriginal use becoming apparent. The Caves have been known to Europeans for around 150 years but the history of the early years is far from clear.

Symposium on Cave Surveying - Aerial Photographs for Cave Studies, 1987, Lowe D. J.

Le karst du gypse du centre de la dpression de l'Ebre (Espagne), 1990, Soriano, M. A.
THE GYPSUM KARST OF THE CENTER OF THE EBRE BASSIN (SPAIN) - The central Ebro basin was filled with evaporitic deposits (gypsum and limestones) during the Miocene. During the Quaternary, several alluvial terrace and pediment levels were developed and they overlay the gypsum deposits. A large number of karstic landforms developed on gypsum have been found. The most important reason is its high solubility. We have found different types of microlandforms. The most important are Rillenkarren, solution pits and micro etching. There are also small tumuli. They are active at present. We have differentiated three macrolandforms: paleocollapses, depressions and alluvial dolines. The paleocollapses are very narrow and deep. They are filled with quaternary materials. They are not active and were generated in the Middle or Upper Pleistocene. The depressions were developed by the gypsum dissolution, together with topographical and geomorphologic factors. They do not seem to be active nowadays. The alluvial dolines are developed on the terrace and pediment deposits, which overlay gypsum materials. There is basin, well and pan-shaped dolines and they are especially frequent in the T2 terrace level. From the study of aerial photographs of different years, the variations in the number and size of dolines and their density have been determined. Natural factors (lithology and fractures), together with human activities (irrigation) are the principal causes in their development.

Spectacular towers (average 130 m high) are to be seen in the Lijiang plain near Guilin in middle and upper Devonian limestone forming a downthrown structural panel surrounded by the high relief of a cockpit karst. The limestone was fractured by at least three Triassic and Tertiary tectonic episodes. Statistical analysis of the altitudes of tower summits shows that they are distributed according to a log-normal law with a well marked mode at 250-280 m. This mode is very similar to that of the depression altitudes of the cockpit karst. It was deduced that tower summits and cockpit bottoms show that there was an ancient, relatively flat surface which was the basic level for flow in the surrounding karstic relief (water table at ground level). Fall in this ground water caused preferential karstic breakdown in very fractured zones, leaving the stronger blocks. This subsidence must have taken place in stages, as is shown by Pliocene and lower Quaternary fossil cavities at various altitudes of the towers. Observation of fracturing in the field, in aerial photographs and satellite images show that the edges of the towers are mainly transverse faults with sub-vertical planes

Four areas with different styles of fenglin (tower and cone karst) are investigated using morphometric techniques in the Shuicheng area of Guizhou Province. The karsts were formed in the Neogene and were uplifted during the Quaternary, to present elevations of about 1800 m. Measurements were made of the characteristics of 745 cones using maps and aerial photographs supplemented by field investigations. The karst cones are found to be of almost constant slope angle (45-degrees to 47-degrees) regardless of structure, but with a tendency for slightly lower slopes to occur where the carbonates have impure interbeds. Although generally symmetrical in plan, elongation of both cones and intervening depressions appears controlled by major elements of the structure and the general slope of the topography. Spatial analysis shows the cones to be relatively uniformly distributed in three of the four cases studied. Morphometric evidence points strongly to parallel slope evolution of cones. A model is offered of landscape evolution in which sequential development occurs through stages of karst-tableland with dolines to fencong-depression to fenglin-depression and finally to fenglin-plain. Geological control becomes less influential as this development proceeds, with the smaller and more widely spaced cones of the later stages becoming increasingly symmetrical in form

Geological and hydrogeological remote sensing techniques can be applied very favorably to Dinaric karst in the Balkans, a well-known reference area for studies of karst phenomena. The elements that make karst terrain of the Dinarides suitable for remote sensing are geomorphologic characteristics, in particular the specific surface drainage and karst forms, the varying vegetation that most often reflects the existence of different geologic formations on the surface, and distinct tectonic features. Some of the world's largest springs, ponors (sinks), and dolines are controlled by fractures visible on both satellite images and aerial photographs. Lineaments represent fault zones, systems of close faults with similar strike, or large individual faults which all are young or show recently renewed activity. Their neotectonic character and major importance for karst groundwater flow are confirmed by numerous field investigations including water tracing, geophysical research, and drilling

Deforestation in the Dominican Republic: a village-level view, 1997, Brothers Ts,
Deforestation is still rapid in some parts of the Caribbean, though it has attracted much less attention than deforestation in mainland Latin America. This paper examines the history and causes of the recent rapid deforestation of a lowland karst region of the Dominican Republic in the light of models derived from studies in Central America and the Amazon. Investigation was limited to the vicinity of a single village (Los Limones). Information was drawn from interviews, questionnaires and ground reconnaissance, in addition to archival information and aerial photographs. Deforestation at Los Limones involved many of the same elements seen in mainland deforestation, including construction of access roads, spontaneous agricultural colonization, and pasture conversion, but it followed no single mainland model. Logging, not normally emphasized as a cause of Latin American deforestation, played an important role in opening up the forest to agricultural settlement. Pasture conversion was not a matter of aggregation of large ranches by wealthy absentee landowners, as in the Amazon, but apparently a local response to the economic and ecological advantages of cattle raising. Government actions strongly influenced deforestation, but not via colonization schemes or economic subsidies for cattle ranching; the rhythm of deforestation at Los Limones was tied to the monopolistic practices of the dictatorship of Rafael Trujillo and the social disorganization following his assassination. The national government in fact bears the primary responsibility for deforestation of Los Haitises, a conclusion that contradicts the government's own suggestion that the destruction was largely carried out by poor farmers. Prospects for rehabilitation of the deforested area are gloomy because of the extent of ecological damage and the continued adversarial relationship between the government and the rural population

Stacks and notches at Hopewell Rocks, New Brunswick, Canada, 1998, Trenhaile A. S. , Pepper D. A. , Trenhaile R. W. , Dalimonte M. ,
Spectacular rock formations have developed in coarse, poorly sorted conglomerates and arkosic sandstones at Hopewell Rocks in the Bay of Fundy, which has the largest tidal range in the world. The average gradient of the shore platform is 3.2 degrees, although it varies because of slight differences in rock hardness. Schmidt Rock Test Hammer measurements show that the rock is generally no more resistant in 16 stacks and in one stack-arch than in the adjacent platform and cliff. Most stacks, arch-tunnels and caves in this area result from dissection of the rock mass along prominent, well-spaced joint planes. Old photographs suggest that the stacks at Hopewell Rocks may have developed in the :Last 100 to 250 years. Notches are ubiquitous at the cliff foot, and they are responsible for the characteristic mushroom-shaped appearance of the stacks. Although there is no consistent relationship between the depth of notches on the seaward and landward sides of the stacks, the notches are at higher elevations on the seaward side. The deepest part of most notches is a little below the mean high tidal level, although several are up to 1 or 2 m below it, especially on the landward side of stacks. Stack morphology and notch depth change in a fairly predictable manner through time, as the stacks become increasingly isolated from the cliff. (C) 1998 John Wiley & Sons, Ltd

A hazard map of the Magnesian Limestone in County Durham, 1998, Green M. R. , Forth R. A. , Beaumont D. ,
A large part of County Durham is underlain by carbonate rocks of Permian age, principally Magnesian Limestone. In recent years problems have been encountered in constructing on the Permian carbonates, due to dissolution followed by subsidence and/or sink hole formation. Features believed to be triggers for dissolution of limestone have been mapped and a weighted factor hazard map has been created. The map is based on an extensive review of existing site investigation data including a study of aerial photographs. Records of dissolution features noted by the County Council engineers have been incorporated into the hazard map. The map is intended as a guide for County Council Engineers who are planning site investigations within the area. The preparation of the map and its limitations are discussed

A Colour Atlas of Carbonate Sediments and Rocks under the Microscope, 1998, Adams A. E. , Mackenzie W. S.

Exploitation of massif fracturation by karstification: example of the Causse de I'Hortus (Herault, France), 1999, Boinet N,
The Causse de l'Hortus is a particularly well adapted massif to the survey of the fracturation and to its interdependences with karstification. The on-going realisation of a hydrogeological and speleological monograph of the massif, as well as the existence of more than twenty kilometers of prospected channels belonging to the active networks, provide new data which can be compared with previous surveys carried out in this field. The comparison of the directions of fracturation, visible on aerial photographs with directions currently exploited by the karstic channels on the whole Causse, show the effect of the greater fractures and the influence of the hydraulic gradient on the exploitation of the fracture spectrum. To sum up, the display of the relationships between the dextral disconnecting faults and the temporary emergences of the 'boulidou' type, results in concrete applications for speleological and hydrogeological aspects. The survey of these 'boulidous' provides new information about the vertical structuration of the karst. (C) Elsevier, Paris

Ribbon helictites: a new category, 1999, Rowling, Jill

Describes the size, shape, abundance and location of ribbon helictites and proposes possible growth mechanisms for them. SEM photographs of surface of a ribbon helictite show an unusual crystal form for a calcite speleothem, together with apparent etching and pitting of surfaces. These surfaces exhibit some features found in organically deposited calcite. Further optical work revealed that stem of ribbon helictites is composed of a twinned pair of crystal aggregates, with stem's central canal lying in this twin plane. The ribbon also appears to exhibit twinning. Oval features on ribbon's surface appear to be twinned aggregates, originating from ribbon's central canal. It is proposed that ribbon helictites form by two growth stages: development of stem and then a ribbon, with influences from acidic solutions. Overall shape is strongly controlled by crystal habit.

Geohazard map of cover-collapse sinkholes in the 'Tournaisis' area, southern Belgium, 2002, Kaufmann O. , Quinif Y. ,
This paper reports the methodology developed to draw up a geohazard map of cover-collapse sinkhole occurrences in the 'Toumaisis' area. In this area, Carboniferous limestones are overlain by a Mesocenozoic cover, mainly consisting of marls, sand and clay. The thickness of this cover ranges from a few meters to more than 100 m. The surficial morphology of the area does not show any karstic evidence except for the occurrence of these collapses. From a paleogeographical point of view, a developed quaternary karst is not conceivable in the area. Recent works suggested that the collapses are set off from reactivated paleokarsts. The paleokarsts studied in the area proved to be the result of a particular weathering of the limestone. The organization of these paleokarsts seems very low and mainly guided by the limestone fracturing. As for most induced sinkholes, the reactivation of these paleokarsts is linked to the lowering of piezometric heads. In most of the area, a thick cover and intensive land use mask potential surface hints of the buried paleokarsts and of the fracturing of the bedrock. Aerial photographs and remote sensing techniques have therefore shown little results in delineating collapse hazard zones up to now. The study of the surficial morphology is also of little help. In order to draw up the geohazard map in such a difficult context, hydrogeological data and geological mapping information could only be used. These informations are based on a limited number of boreholes and piezometers and are thus, only valid on a regional scale. Records of former collapses were also available. These records were of great interest since sinkhole distribution is obviously clustered in the area. Bedrock roof and cover formation floor altitudes were digitized and adapted to produce digital thematic maps. Piezometric heads were imported from a calibrated groundwater model of the aquifer. These data and a digital elevation model of the area were integrated into a geographical information system (GIs) to produce a coherent 3-D description of the area on a regional scale. Parameters such as the dewatering of the limestone and the thickness of the cover formation where sinkholes occurred were then estimated. Density of former collapses was also computed. This showed that zones of high sinkhole occurrence coincide with zones of heavy lowering of piezometric heads. Combining the density of former collapses with the dewatering of the limestone enabled us to delineate zones of low, moderate and high collapse hazard. (C) 2002 Elsevier Science B.V. All rights reserved

Subsidence rates and urban damages in alluvial dolines of the Central Ebro basin (NE Spain), 2002, Soriano M. A. , Simon J. L. ,
In the central Ebro basin, alluvial dolines develop on Quaternary materials overlying Neogene evaporites. This process is very active. Analysing aerial photographs of different years important differences can be observed. Since the 1970s, when the urbanisation of the area took place, karst processes have damaged many buildings and infrastructures. From the dates of construction and the repair of a number of buildings and pavements we calculate subsidence rates (12-120 mm/year). Moreover, we decided to monitor, for around 4 years, three dolines developed on urban areas to determine their subsidence behaviour. A water level device (with an error of 2-3 mm) was utilised for this purpose. The subsidence rates, so obtained, are 64.5, 39 and 21 mm/year, which fit with the previous data from repaired zones

Results 1 to 15 of 47
You probably didn't submit anything to search for