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Featured articles from Cave & Karst Science Journals
Characterization of minothems at Libiola (NW Italy): morphological, mineralogical, and geochemical study, Carbone Cristina; Dinelli Enrico; De Waele Jo
Chemistry and Karst, White, William B.
The karst paradigm: changes, trends and perspectives, Klimchouk, Alexander
Long-term erosion rate measurements in gypsum caves of Sorbas (SE Spain) by the Micro-Erosion Meter method, Sanna, Laura; De Waele, Jo; Calaforra, José Maria; Forti, Paolo
The use of damaged speleothems and in situ fault displacement monitoring to characterise active tectonic structures: an example from Zapadni Cave, Czech Republic , Briestensky, Milos; Stemberk, Josef; Rowberry, Matt D.;
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;
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Your search for structure (Keyword) returned 702 results for the whole karstbase:
Showing 16 to 30 of 702
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The new data from the Big Hole and its vicinity give some further support to the view maintained previously as to its origin, though an approach through water chemistry proved non-committal. Difficulties attaching to an origin by true phreatic solution of underlying limestone through circulations of groundwater of meteoric provenance remain however. Nevertheless, the possibility, not considered previously, that the Big Hole is due to hydrothermal solution in the manner of many collapse structures associated with uranium ore bodies in southwestern U.S.A. finds no support in the regional geology of the Shoalhaven valley, though it could produce features of the right dimensions. Previous lack of a complete parallel to the Big Hole has been removed by reference to the furnas of southern Brazil where a similar origin to the one proposed here is also inferred.
Bathymetric map, seismic reflection profiles, arcer profiles, bottom features, sediment distribution, faults, karst-like topography
The author examines two specimens of Nicoletia texensis Ulrich from the Quintero caves, Tamaulipas (Mexico). Among the most important characteristics of this species the exaggerated lengthening of the legs, cerci, antennae and other appendages has to be mentioned. Among Diplura, nearly the same degree of lengtheneing of the appendages may be observed in Plusiocampa dargilani (Moniez), a troglobitic Campodeidae of France. The structure of the median claw, completely different form other Nicoletia, probably will allow the institution of a new Genus for N. texensis.
The paper presents the diagnosis of 4 new Bathynella species found in Romania: B. paranatans nov. sp., B. boteai nov. sp., B. motrensis nov. sp. and B. plesai nov. sp.; a discussion on B. cf. scythica Botosàneanu et Damian is also given. The morphological features which were used are the general and the fine structure of the genital pereiopode of the male (Pl. 5—8), the chaetotaxy of the maxillula, maxilla, thoracic appendages, uropods and furca. The presence of the distal (coxal) epipodite on the first pereiopod in E. paranatans nov. sp., distinguishes this species from the others (Pl. 1—4). The true taxonomical value of the VIIIth pereiopod of the male is pointed out, which; at least in the case of these species; shows, by its general structure, the relationships, the heterogeneous morphology of the anterior plate (PI. 5- 8, a), marking the speciation.
The author examines two specimens of Nicoletia texensis Ulrich from the Quintero caves, Tamaulipas (Mexico). Among the most important characteristics of this species the exaggerated lengthening of the legs, cerci, antennae and other appendages has to be mentioned. Among Diplura, nearly the same degree of lengtheneing of the appendages may be observed in Plusiocampa dargilani (Moniez), a troglobitic Campodeidae of France. The structure of the median claw, completely different form other Nicoletia, probably will allow the institution of a new Genus for N. texensis.
The paper presents the diagnosis of 4 new Bathynella species found in Romania: B. paranatans nov. sp., B. boteai nov. sp., B. motrensis nov. sp. and B. plesai nov. sp.; a discussion on B. cf. scythica Botosàneanu et Damian is also given. The morphological features which were used are the general and the fine structure of the genital pereiopode of the male (Pl. 5—8), the chaetotaxy of the maxillula, maxilla, thoracic appendages, uropods and furca. The presence of the distal (coxal) epipodite on the first pereiopod in E. paranatans nov. sp., distinguishes this species from the others (Pl. 1—4). The true taxonomical value of the VIIIth pereiopod of the male is pointed out, which; at least in the case of these species; shows, by its general structure, the relationships, the heterogeneous morphology of the anterior plate (PI. 5- 8, a), marking the speciation.
In a previous paper (Ollier and Holdsworth, 1970) we described the island of Kitava and many of the caves on the island. This note supplements that account and describes caves and related features discovered during a brief expedition to the south of the island (Figure 1) in 1971. Kitava is a coral island with a number of terraces and reaches a height of 466 feet. There is a central depression in the top of the island, the site of the lagoon before the reef was uplifted. Some caves are associated with the rim of the island, a few occur on mid-slopes, and others are found along the sea cliffs. Many of the caves have been used for burial of human remains, sometimes associated with pots, clam shells or canoe prows. Canoe prow burials are reported here for the first time. Some caves are associated with megalithic structures and legends of the origin of the various sub-clans (dala) of the island.
The representatives of the genus Stenasellus (sensu lato) in Africa have been previously known from Cote d'lvoire, bassin of the Congo and Somali. The new species of this genus was collected from the well in the town Sicascau (Mali). This species differs from all others in the structure of the carpopodites of pereopods II-IV which are enlarged and armed with multiple curved spines. This character shows a distinct sexual dimorphism. In all other features St. laticarpus sp.n. belongs to the group of St. gjorgjevici Rac. and shows the closest resemblance to St. africanus Monod. It is now preferable to conserve the unity of the genus Stenasellus (sensu lato). The validity of the African endemic genera Metastenasellus Magniez, Parastenasellus Magniez and Magniezia Lanza needs to be confirmed.
The representatives of the genus Stenasellus (sensu lato) in Africa have been previously known from Cote d'lvoire, bassin of the Congo and Somali. The new species of this genus was collected from the well in the town Sicascau (Mali). This species differs from all others in the structure of the carpopodites of pereopods II-IV which are enlarged and armed with multiple curved spines. This character shows a distinct sexual dimorphism. In all other features St. laticarpus sp.n. belongs to the group of St. gjorgjevici Rac. and shows the closest resemblance to St. africanus Monod. It is now preferable to conserve the unity of the genus Stenasellus (sensu lato). The validity of the African endemic genera Metastenasellus Magniez, Parastenasellus Magniez and Magniezia Lanza needs to be confirmed.
Many cavernicolous and phreatic localities are known for the species Stenasellus virei. Some of these, which harbor a rather abundant population have been studied for several years. The endemic populations from permanent waters of some fossil karstic systems seem to have an abnormal composition. They include especially large individuals (juvenile stages being rare). They differ from the phreatic populations, which exhibit a normal distribution in size groups with a normal percentage of juveniles. These differences in the structure of populations may result from physical differences between the habitat in free waters of caves and in phreatic water, and from differences between the associations of species that these two types of hypogean habitat may support.
Many cavernicolous and phreatic localities are known for the species Stenasellus virei. Some of these, which harbor a rather abundant population have been studied for several years. The endemic populations from permanent waters of some fossil karstic systems seem to have an abnormal composition. They include especially large individuals (juvenile stages being rare). They differ from the phreatic populations, which exhibit a normal distribution in size groups with a normal percentage of juveniles. These differences in the structure of populations may result from physical differences between the habitat in free waters of caves and in phreatic water, and from differences between the associations of species that these two types of hypogean habitat may support.
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