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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. ...

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That coarse silt is a geologic term for a silt particle having a diameter in the range of 1/32 to 1/16 mm (31-62 microns, or 5 to 4 phi units).?

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Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
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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;
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Your search for ardeche (Keyword) returned 17 results for the whole karstbase:
Showing 1 to 15 of 17
News from France [Trou de Glaz, St. Marchel D'Ardeche, La Henne Mort], 1947, Munkittrick A. T.

Investigations on the Entocytheridae Ostracods. Data on Sphaeromicola cebennica juberthiei nov. ssp. and Sphaeromicola cirolanae Rioja., 1977, Danielopol Dan L.
Sphaeromicola cebennica juberthiei n. ssp., a cavernicolous ostracod found in the South of France (Systme de Cent Fons and Avencas, Herault), is described here. The new subspecies differs from Sph. cebennica cebennica (found in a cave from Ardche) by the smaller carapace and a reduced distal bristle on the 'finger" of the male copulatory organ. The affinities and differences between the European Sphaeromicola and Sph. cirolanae from Mexico are discussed. The genus Sphaeromicola is divided into two groups of species: the group topsenti and the group cirolanae. Some observations on the mating process of Sph. Cebennica juberthiei are presented. A precocious sexual behaviour of the female in the last post-embryonic instar is recorded. This type of behaviour seems to be a characteristic of the Entocytheridae.

Polydesmide et Craspedosomides cavernicoles nouveaux de France et du Maroc (Myriapoda; Diplopoda)., 1985, Mauris Jean Paul
This is a description of the affinities and biogeographic significance of three new cavernicolous species of Diplopoda from France and Morocco. One species apparently belongs to the Polydesmida (family Paradoxosomidae) and the other two to Craspedosomida (families Caratosphydae and Chordeumidae). 1) Eviulisoma abadi n.sp. is distinguished from other species of this genus by total depigmentation, by the characters of the gonopodial orifice and the male gonopods, by the low number of segments (19) and by its geographic isolation (Morocco) and ecology (Kef Aziza cave). This justifies the establishment of a new sub-genus, Jeekelosoma. The other species of this genus are found in equatorial Africa and the east. E. abadi is the first paleoarctic species of this genus and is the second paleoarctic species of the tribe Eviulisomidi after Boreviulisoma liouvillei Brol.). It is also the first known from a cave. Like the two other known species of Paradoxosomidae known from the southwest of the paleoarctic zone, Boreviulisoma liouvillei Brol. and Oranmorpha guerinii (Gerv.) the new species is indicative of originating in the Ethiopian region at a time when the Sahara was not a barren desert. 2) Ceratosphys maroccana n.sp. from Gouffre Friouato (Morocco) probably is not an epigean troglophile; it is the southernmost species of this genus which is normally found in France and Spain. This is apparently a remnant of a small group of species from the south of Spain that constitute a sub-genus Proceratosphys Mau. and Vincente. 3) Orthochordeumella leclerci n.sp. (caves of Ardche, France) manifest the presence unique in this genus of cavernicolous characters including depigmentation and extreme length of antennae and is the only truly troglobitic species of this genus. Other characters are less distinctive but it is possible to distinguish this species by sexual characteristics from other species, notably that from the neighbouring geographic area, O. cebennica (known only from the Ardche region) which is troglophilic. The other three species are found in epigean forest habitats, one in the Pyrenees, the other two in the Tyrol, the Swiss Jura, Baden and the northeast of France and Belgium.

Les karsts dans le Jurassique ardchois, 1992, Marchand, Th.
ARDECHE KARSTS IN THE JURASSIC LIMESTONES - The southern part of the department of the Ardeche consists of numerous karstic zones. In these places, there are several caves, some of which are well-known: The Sauvas-Cocalieres cave, St Marcels cave... But speleological and scientific studies have mainly focused on the Cretaceous karst. The Ardche gorges cut through this area. The Jurassic karsts although lesser known deserve to be studied in depth for their hydrogeological and geomorphologic interest. The surface landforms show evidence of the intense karstification, but it is deep down underground that these phenomena are most impressive. Four elements characterise the originality of these plateaus: the very strong amplitude of outflows in relation to the structure, the active grinding and the neotectonic affect most of the caves, the importance of the fillings which are sometimes allochtonous and the probable age of the caves. In most cases, investigating them means using subterranean diving techniques.

Les recoupements karstiques de mandres encaisss, 1997, Nicod, Jean
Three types of cut-off can be observed: 1) by natural bridge or short tunnel: Pont d'Arc type self-piracy (Ardeche, France) ; 2) by caves system or hydrogeological network, Lesse type (Ardenne, Belgium) ; 3) subaerial in karstic environment, the case of Vis in Navacelles (Herault, France). The main processes are debated: anteriority or/and coexistence of the underground drainage, impact of neotectonics, of the load and the screes and of the water chemistry changes.

Le karst des plateaux jurassique de la moyenne vallee de l'Ardeche: datation par paleomagnetisme des phases devolution plio-quaternaires (aven de la Combe Rajeau), 2001, Audra P. , Camus H. , Rochette P.

Le karst des plateaux jurassiques de la moyenne valee de l'Ardeche; datation par paleomagnetisme des phases d'evolution plio-quaternaires (aven de la Combe Rajeau), 2001, Audra P, Camus H, Rochette P,
Thanks to its immunity, karst is an excellent recorder of environmental change, which also offers the possibility for dating. Karst records position of old base levels, in particular to which were linked horizontal underground drains located near the piezometric surface. After a base level lowering, a new drain appears at a lower level, the old perched drain being abandoned. If base level lowering is slow, the initial drain is progressively entrenched, forming a canyon. The 'Combe Rajeau' cave system corresponds to this last type: a 100 m high underground canyon, continuously entrenched during the Ardeche valley downcutting. The underground river left several terraces during the entrenchment. Knowing that speleothem U/Th radiometric dating method covers only the most recent part of karst systems history, which spans over several million years, paleomagnetism has been applied to date the Combe Rajeau sediments. A more precise knowledge of the evolution phases of this system provides a better understanding of the middle Ardeche valley evolution upon which it depends

L'aven de la Combe Rajeau : un jalon dans l'evolution du karst des plateaux jurassiques et de la moyenne vallee de l'Ardeche, 2001, Audra Ph. , Camus H. , Rochette P.
The << Combe Rajeau >> aven is a large cave system in the Ardeche Jurassic limestones. It harbours a 100 m high underground canyon, which was entrenched during the Ardeche downcutting. Paleomagnetic dating of the canyon's sediments allow us to follow this entrenchment during about 2 m. y. (magnetic polarities related to the Brunhes and Matuyama periods). Correlation between the underground levels and the Ardeche terraces allows to date the beginning of the Ardeche entrenchment to about 2 Ma, with a middle level around 780 ka. Over this period, mean entrenchment lowering is about 5 cm/ka.

Le gaz carbonique dans la dynamique de l'atmosphere des cavites karstiques : l'exemple de l'Aven d'Orgnac (Ardeche): Carbon dioxide in karst cavity atmosphere dynamics: the example of the Aven d'Orgna, 2001, Bourges F, Mangin A, D'hulst D,
ResumeLe suivi des teneurs en CO2 de l'atmosphere de grotte montre que le transfert aerodynamique peut etre un processus majeur de la dynamique du systeme karstique. Les parametres meteorologiques et la geometrie des cavites controlent les echanges entre l'atmosphere souterraine et l'exterieur. L'air enrichi en CO2 biogenique transite en ecoulement diphasique par le reseau microfissural depuis le sol jusque dans la grotte ou il est produit en continu au niveau des parois. L'analyse des vidanges aerodynamiques de zones confinees et des mesures de debit donnent la production moyenne de CO2 par unite de surface dans la cavite

Intrt de lapproche morphognique pour la comprhension globale dune grotte haute valeur patrimoniale, la grotte Chauvet (Ardche - France), 2004, Delannoy Jeanjacques, Perrette Yves, Debard Evelyne, Ferrier Catherine, Kervazo Bertrand, Perroux Annesophie, Jaillet Stphane, Quinif Yves
Interest of the morphogenesis approach to improve the knowledge of a high-value heritage: Chauvet cave (Ardche, France) - This paper describes the shapes and cave deposits of the Chauvet cave. Especially, the geomorphologic approach improves the global understanding of the Chauvet cave characteristics while Man and animal prehistoric occupancies. Access to the cave, painting location in the cave, and finally cave closing, are discussed on geomorphologic basis to answer the questions asked by prehistorians and archaeologists. The ultimate goal of this paper is to enhance the contribution of the geomorphologic high resolution mapping to the prehistoric investigations. To answer the three questions above, we used shapes and deposits to relate the past cave environments. Soil detailed map allows to describe deposits and shapes in a stratigraphic approach. Some U/Th dating complete the chronology especially during Man and animal occupancy; thus, the closing of the prehistoric entrance has been dated older than 15000 years. Also, this paper shows the interest of crossing the disciplinary approaches in the understanding of such a complex scientific object: the Chauvet cave, a high value Man heritage

The effect of the Messinian Deep Stage on karst development around the Mediterranean Sea. Examples from Southern France, 2004, Audra P, Mocochain L, Camus H, Gilli E, Clauzon G, Bigot Jy,
It is difficult to explain the position and behaviour of the main karst springs of southern France without calling on a drop in the water table below those encountered at the lowest levels of Pleistocene glacio-eustatic fluctuations. The principal karst features around the Mediterranean are probably inherited from the Messinian period ('Salinity crisis') when sea level dropped dramatically due to the closing of the Straight of Gibraltar and desiccation of the Mediterranean Sea. Important deep karst systems were formed because the regional ground water dropped and the main valleys were entrenched as canyons. Sea level rise during the Pliocene caused sedimentation in the Messinian canyons and water, under a low hydraulic head, entered the upper cave levels. The powerful submarine spring of Port-Miou is located south of Marseille in a drowned canyon of the Calanques massif. The main water flow comes from a vertical shaft that extends to a depth of more than 147 in bsl. The close shelf margin comprises a submarine karst plateau cut by a deep canyon whose bottom reaches 1,000 in bsl. The canyon ends upstream in a pocket valley without relation to any important continental valley. This canyon was probably excavated by the underground paleoriver of Port-Miou during the Messinian Salinity Crisis. Currently, seawater mixes with karst water at depth. The crisis also affected inland karst aquifers. The famous spring of Fontaine de Vaucluse was explored by a ROV (remote observation vehicle) to a depth of 308 in, 224 m below current sea level. Flutes observed on the wall of the shaft indicate the spring was formerly an air-filled shaft connected to a deep underground river flowing towards a deep valley. Outcroppings and seismic data confirm the presence of deep paleo-valleys filled with Pliocene sediments in the current Rhone and Durance valleys. In the Ardeche, several vauclusian springs may also be related to the Messinian Rhone canyon, located at about 200 in below present sea level. A Pliocene base level rise resulted in horizontal dry cave levels. In the hinterland of Gulf of Lion, the Cevennes karst margin was drained toward the hydrologic window opened by the Messinian erosional surface on the continental shelf

Etude des palokarsts des environs de Saint-Remze (Ardche, France) : mise en vidence dune rivire souterraine fossilise durant la crise de salinit messinienne, 2005, Martini, Jacques
Paleokarst investigation near Saint-Remze, Ardche, France discovery of an underground river fossilized during the Messinian salinity crisis - The paleokarst features studied in this paper are hosted in Lower Cretaceous limestone and generally appear as filled caves, subsequently de-roofed by denudation. The most important of them forms a sequence of segments developed at a relatively constant elevation of 360-380 m above sea level and can be traced over a length of 5.2 km. The ancient cave passages generally appear as soil covered bands, 5 to 20 m in width and limited on both sides by limestone outcrops. At surface the nature of the cave filling is revealed mainly by scattered blocks: calcite from speleothems and calcified clay, silt, sand and breccia. In the best preserved places, the earth band lies in a trench, where the walls may display a cave morphology and where the filling is often exposed in a undisturbed state. Three types of detrital cave filling have been identified, which in stratigraphical order are as follows: 1) Beige-grey silt, sand and microconglomerate of immature alluvials, with elements of Paleozoic granites and metamorphic rocks, and Upper Miocene volcanics, both originating from the Cvennes Mountains 30 km to the NW. The lithological composition is comparable to the recent alluvials of the Paleokarst investigation near Saint-Remze, Ardche, France discovery of an underground river fossilized during the Messinian salinity crisisArdche River, which is flowing a few kilometers to the SW and is deeply entrenched into a canyon at elevations of 40 to 80 m. The karst context, combined with the biostratigraphical data obtained from rodent molars in the alluvials, suggests an Uppermost Miocene age, comprised between ~5.8 and ~5.45 Ma. 2) Red mature alluvials and colluvials originating from local reworking of surficial karst residuals. At one spot they gave a paleontological age of 3.6 to 3.0 Ma, but from the local karst context one may expect ages from final Miocene to Pleistocene in other spots. 3) Monogenic breccia generated from wall gelifraction, which is Pleistocene after rodent molars found in two places. The paleocave is visualised as formed by an underground stream fed from swallow-holes on the bank of the Ardche River, when it was flowing more than 300 m higher than its actual bed. With regard to its relatively constant elevation and a discordant relationship with the country rock bedding, it is interpreted as a vadose cave controlled by a paleo-water-table. The other fillings (2 and 3) were deposited during subsequent vadose speleogenesis and after considerable water-table lowering. The elevation of this fossilised underground river coincides fairly well with the pre-salinity crisis abandonment surface (5.52 Ma), which is evidenced in the area by high perched gravel relics. The end of the speleogenesis could have taken place just before this event (~5.6 Ma) or at an age not younger than ~5.45 Ma. In the latter possibility, speleogenesis had to be working before the regressive erosion generated by the drastic lowering of the Mediterranean Sea [5.52 to 5.33 Ma, Clauzon et al, 2005 ] reached the area and de-watered the deep karst aquifer. This fossil underground river provides also information about the morphological evolution of the area. For instance the nature of the immature alluvials suggests that the torrential regime of the Ardche was about the same than today. It also indicates that the important and famous cave systems in the area (Grotte de Saint-Marcel, Aven dOrgnac, Systme de Foussoubie, Grotte Chauvet), which are developed at lower elevations, cannot be older than ~5.6 Ma and most likely formed mainly during the Plio-Pleistocene, although most of them have been initiated during the salinity crisis.

La grotte de Saint-Marcel (Ardche) : un rfrentiel pour lvolution des endokarsts mditerranens depuis 6 Ma, 2006, Mocochain Ludovic, Bigot Jeanyves, Clauzon Georges, Faverjon Marc Et Brunet Philippe
Saint Marcel Cave: an important site for the evolution of the mediterranean endokarst in the last 6 million years - The plateau of Saint-Remze is a mesozoic carbonate platform located close to the Rhne valley. This carbonate platform is intensely karstified, as proven by Saint-Marcel Cave, which is 53 km long. It displays several horizontal levels. The upper and middle levels are dry most of the time. They are composed of large horizontal conduits extending over several kilometers. The lowermost third level is active and partly drowned. Scuba divers have reached a depth of 65 m below the Ardche. The horizontal levels are not controlled by geological structure. Consequently, the distribution of the horizontal levels depends only on the base level which constrains the whole organisation of the Ardche karst. Around the Ardche Canyon and the Rhne Valley, the identification of the marks made by the messinian salinity crisis allows to reconstruct the evolution of the local base level. This reconstruction allowed us to study the Saint-Marcel Cave in a geodynamical and chronological frame over the last six million years. The morphological investigations in the cave, combined with the study of the base level change, have shown three main stages of speleogenesis and two main types of water flow. Following entrenchment of the deep messinian canyons during the salinity crisis, cave levels developed according to the very deep base level of that time. At the end of the crisis, at 5.35 Ma, the Pliocene transgression caused a sudden rise of the base level. The messinian valleys as well as the karst outflows were flooded. This hydraulic change produced a per ascensum genesis of some shafts that are called chimney-shafts. This per ascensum genesis of chimney-shafts repeated itself at each stage of the Pliocene base level rise. During the Pliocene (5.32 to 2 Ma), the infilling of the messinian canyons by fluvial sediments shows that the Ardche river had several long stages of base level stability, allowing the development of new cave levels. The karst system was fed by both local recharge from the Saint-Remze Plateau and large underground shortcuts through the Ardche river meanders. The detailed study of the main levels in Saint-Marcel Cave reveals the existence of intermediate stages in the evolution of the base level, allowing us to refine its knowledge.

The Ardeche endokarstic responses to the eustatic variations resulting from the Messinian salinity crisis, 2006, Mocochain L. , Clauzon G. , Bigot J. Y. ,
The Messinian salinity crisis is typically recorded by evaporites in the abyssal plains of the Mediterranean Sea and by canyons incised into the Mediterranean margins and their hinterlands. However, the impacts of crisis on geomorphology and surface dynamics lasted, until. canyons were filled by sediments in the Pliocene (fig. 2). In the mid-Rhone valley, the Ardeche Cretaceous carbonate platform is incised over 600 m by the Rhone Messinian canyon. The canyon thalweg is located - 236 m Lis) (below sea level) in the borehole of Pierrelatte [Demarcq, 1960; fig. 1]. During the Pliocene, this canyon was flooded as a ria and infilled by a Gilbert type fan delta [Clauzon and Rubino, 1992; Clauzon et al., 1995]. The whole Messinian-Pliocene third order cycle [Haq et al., 1987] generated four benchmark levels. The first two are [Clauzon, 1996]: (i) The pre-evaporitic abandonment Surface which is mapped around the belvedere of Saint-Restitut (fig. 1). This Surface is synchronous [Clauzon, 1996] of the crisis onset (5.95 Ma) [Gautier et al., 1994; Krigjsman et al., 1999] and, consequently, is an isochrounous benchmark. (ii) The Messinian erosional surface is also an isochronous benchmark due to the fast flooding [Blanc, 2002] of the Rhone canyon, becoming a ria at 5.32 Ma [Hilgen and Langereis, 1988]. These surfaces are the result of endoreic Mediterranean sea level fall more than a thousand meters below the Atlantic Ocean. A huge accommodation Space (up to more than 1000 in) was created as sea-level rose up to 80 in above its present-day level (asl) during (lie Pliocene highstand of cycle TB 3.4 (from 5.32 to 3.8 Ma). During the Lower Pliocene this accommodation space was filled by a Gilbert fan delta. This history yields two other benchmark levels: (i) the marine/non marine Pliocene transition which is an heterochronous surface produced by the Gilbert delta progradation. This surface recorded the Pliocene highstand sea level; (ii) the Pliocene abandonment Surface at the top of the Gilbert delta continental wedge. Close to the Rhone-Ardeche confluence, the present clay elevations Of file four reference levels are (evolution of base-level synthesized in fig. 4): (1) 3 12 in asl, (2) 236 in bsl, (3) 130 m asl, (4) 190 In A. The Ardeche carbonate platform underwent karstification both surficial and at depth. The endokarst is characterized by numerous cavities organised in networks. Saint-Marcel Cave is one of those networks providing the most coillplete record (fig. 5). It opens out on the northern side of the Ardeche canyon at an altitude of 100 m. It is made up by three superposed levels extending over 45 km in length. The lower level (1) is flooded and functionnal. It extends beneath the Ardeche thalweg down to the depth of 10 m bsl reached by divers. The observations collected in the galleries lead us to the conclusion that the karst originated in the vadose area [Brunet, 2000]. The coeval base-level was necessarily below those galleries. The two other levels (middle (2) and upper (3)) are today abandoned and perched. The middle level is about 115 m asl and the upper one is about 185 m A. They are horizontal and have morphologies specific to the phreatic and temporary phreatic zone of the karst (fig. 6). In literature, the terracing of the Saint-Marcel Cave had been systematically interpreted as the result of the lowering by steps of the Ardeche base-level [Guerin, 1973; Blanc, 1995; Gombert, 1988; Debard, 1997]. In this interpretation, each deepening phase of the base level induces the genesis of the gravitary shaft and the abandonment of the previous horizontal level. The next stillstand of base level leads to the elaboration of a new horizontal level (fig. 7). This explanation is valid for most of Quaternary karsts, that are related to glacio-eustatic falls of sea-level. However Our study on the Saint-Marcel Cave contests this interpretation because all the shafts show an upward digging dynamism and no hint of vadose sections. The same 'per ascensum' hydrodynamism was prevailing during the development of the whole network (figs. 8 and 9). We interpret the development of the Ardeche endokarst as related to the eustatic Messinian-Pliocene cycle TB 3.4/3.5 recorded by the Rhone river. The diving investigations in the flooded part of the Saint-Marcel Cave and also in the vaLlClusian springs of Bourg.-Saint-Andeol reached - 154 in bsl. Those depths are compatible only with the incision of the Messinian Rhone canyon at the same altitude (- 236 m bsl). The Saint-Marcel lower level would have develop at that time. The ascending shaping of levels 2 and 3 is thus likely to have formed during the ensuing sea-level rise and highstand during the Pliocene, in mainly two steps: (i) the ria stage controlled by the Mediterranean sea level rise and stillstand; (ii) the rhodanian Gilbert delta progradation, that controlled the genesis of the upper level (fig. 10)

Geodynamic evolution of the peri-Mediterranean karst during the Messinian and the Pliocene: evidence from the Ardeche and Rhone Valley systems canyons, Southern France, 2006, Mocochain Ludovic, Clauzon Georges, Bigot Jean Yves, Brunet Philippe,
During the Messinian-Pliocene eustatic cycle, the Mediterranean Sea was characterized by a short lived (5.95-5.32[no-break space]Ma) sea-level fall, which attained - 1500[no-break space]m in some areas. The study of benchmark levels permits the chronology and dynamics of this event to be established. In the Rhone's middle valley, our investigations allow a new interpretation for the genesis of the Ardeche endokarst. A fall in base-level was responsible for both the incision of the so-called Messinian canyons as well as a deep karst development. Karst systems were formed in association with the Messinian canyons of the Ardeche and Rhone Rivers. During the flooding of the Mediterranean Basin (5.32[no-break space]Ma), these karst systems were filled by water and plugged by sedimentary infilling of the rias. This mechanism pushed groundwater backward through the karst system, which in turn formed diagnostic 'chimney-shafts'. These pathways were geometrically connected to the position of the Pliocene benchmark levels. Consequently, the Messinian Salinity Crisis was responsible for two karst responses.The first was concomitant with the crisis itself and corresponds to the formation of a karst system. The second followed the Messinian Salinity Crisis and corresponds to the adaptation of this karst system in Vauclusian karsts by the formation of 'chimney-shafts'

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