bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comportement de la sillimanite et de l'andalousite dans quelques roches pyreneennes
Authors: Macaudiere Jean 
Published: March 2020

Abstract
The high valley of Louron is occupied by a complex of granitic and metamorphic rocks of which the Lys-Caillaouas granite is best known. The stability domains and modalities of transformations of silicates during metamorphism, particularly andalusite and sillimanite, are discussed.
Note preliminaire sur le Bathonien inferieur du Bugey (Jura meridional)
Authors: Mangold Charles , Enay R. , Dominjon Pierre 
Published: March 2020

Abstract
The recent discovery of lower Bathonian (upper middle Jurassic) ammonites at several places in the Bugey region of the southern Jura mountains of eastern France resolves the problem of the relationship of the Bajocian to the Bathonian in this key region. Fauna of upper Bajocian (lower middle Jurassic) and middle and upper Bathonian had long been known but lower Bathonian was unknown. One bed is particularly rich in a varied fauna of ammonites, pelecypods, gastropods, and echinoderms in a remarkable state of preservation. The faunal association shows the coexistence of the forms of the Zigzag beds of England and the Wuerttembergicus beds of Germany, thus confirming the homology of these two horizons. The geographic distribution of type genera of the lower Bathonian in western Europe permits the identification of two faunal domains overlapping in Lorraine and the northern Jura mountains as well as the Bugey region. The genus Zigzagiceras extends from southern England through Switzerland, the Jura mountains, and the Basses-Alpes to Sicily, and also has been found in Portugal. The western limit of the species Parkinsonia (Oraniceras) wuerttembergica occurs in Germany, Lorraine, the Jura mountains, and Sicily. It appears that the genera Morphoceras and Ebrayiceras may have an even greater distribution.
Stratigraphie du Silurien du Tassili N'Ajjer
Authors: Dubois Paul , Mazelet Pierre 
Published: March 2020

Abstract
A new lithostratigraphic nomenclature is established for the Silurian of the Tassili N'Ajjer and the mole anticlines of Essaoui Mellene in southeastern Algeria from a new series of sections examined from Tihemboka westward to Oued Amassine. The unit termed the graptolite clay formation is a homogeneous unit of plastic clays ranging from 350 to 450 meters in thickness, with thin lenticular beds of ripple-marked fine-grained sandstone. The sandstones in the upper part of the formation thicken eastward, and in the eastern half of the region the fine-grained sand gives way to coarser grained sand and grit. In the eastern third of the region, the Gara Marhet sandstone is an important member. The overlying heterogeneous Atafatafa formation comprising multiple facies of lenticular silty clays, siltstones, shaly sandstones, ferruginous oolitic sandstones, massive sandstones, and quartzites thins from a thickness of 150 meters on the west, to 80 meters on the east. Ripple marks, markings of organic origin, and tigillites are numerous.
Etat actuel de nos connaissances sur la geologie de la Guyane francaise
Authors: Choubert Boris 
Published: March 2020

Abstract
A summary of the geology of northern French Guiana includes brief discussions of the stratigraphy, tectonics, dolerite dikes, Quaternary deposits and mineral resources. Precambrian rocks, which constitute a major part of the area, are represented by a discordant series ranging between 4000 and 1800 m.y. in age, which have been metamorphosed by successive granitization and intrusions of basic rocks. Two tectonic depressions, oriented in an ESE-WNW direction, occupy part of the area, one in the north extending halfway into Surinam, the other in the central region. Dolerite dikes up to 70 km long strike NNW-SSE. Transgressions and regressions in the Quaternary resulted in the deposition of three series of sediments on fossiliferous Eocene beds. Gold deposits, the basic resource of the country, seem to be related to the Caribbean granitization. A table correlates the stratigraphy of French Guiana, Guyana, and Surinam.
Formations eruptive antejurassiques en Eubee moyenne (Grece)
Authors: Guernet Claude 
Published: March 2020

Abstract
In addition to the well-known upper Jurassic or lower Cretaceous lava flow in the central part of Euboea island, Greece, an older flow occurs between a Permian formation with neritic fossils and an upper Triassic algal limestone. A Ladenian-Carnian (Triassic) age is tentatively assigned to the flow. Between this and the Jurassic flow, spilites and related rocks overlie shales interbedded with crinoidal and fusulinid limestones and overlain by algal limestones. Outcrops at Tharounia expose the flows and the intermediate beds.
Stratigraphie du Paleogene du bassin de Paris en relation avec les bassins avoisinants
Authors: Blondeau A. , Cavelier Claude , Feugueur Leon , Pomerol Charles 
Published: March 2020

Abstract
New data on the lower Tertiary of the Paris basin places the Vigny limestone in the Montian (Paleocene). The Thanetian-Sparnacian (lower-upper Paleocene) boundary is well-marked. The Ypresian (lower Eocene) in the basin includes the basal lagoonal Sparnacian and the Cuisian at the top. The upper section of the Lutetian includes the Biarritzian. The Ledian (upper Eocene) and probably the Wemmelian in Belgium, and the upper Bracklesham beds in Hampshire (England) should be correlated with the upper Lutetian. The Bartonian substage is extended to include the Auversian, Marinesian, and Ludian which are equivalent to the upper Eocene. The Eocene-Oligocene boundary is situated at the base of the Romainville green shale. The supragypsiferous marls, the lower Tongrian and the Bembridge beds are assigned to the upper Eocene. The Sannoisian is referred to the Stampian in the Paris basin, which corresponds to the upper Tongrian and Rupelian in Belgium and to the Hamstead beds in England. Charts correlating the stages in the Paris basin with the neighboring countries of Belgium and England are given for each stage.
Rotundomys, nouveau genre de Cricetidae (Mammalia, Rodentia) de la faune neogene de Montredon (Herault)
Authors: Mein Pierre 
Published: March 2020

Abstract
On the basis of molars found in white marls between the villages of Bize, Argeliers, and Montouliers, a new Miocene rodent genus, Rotundomys, is erected. Cricetodon montisrotundi Schaub (1944) is rediagnosed and designated as the type species.
Les cordilleres dans les mers cretacees et paleogenes des Carpathes du nord
Authors: Ksiazkiewicz Marian 
Published: March 2020

Abstract
The flysch deposits of the northern Carpathian Alps (southern Poland) contain abundant exotic blocks and pebbles whose dimensions exclude the possibility of their being transported over a long distance. This suggests the presence of cordilleras from which the material was detached. The localization of these features can be shown approximately as a function of the stratigraphic and geographic distribution of the exotic material. The cordilleras have crystalline basements overlain by Paleozoic and Jurassic sedimentary rocks; while in the submerged troughs between the cordilleras, flysch or pelagic formations were accumulated in the Cretaceous and lower Tertiary. Adjoining the cordilleras, in certain periods, littoral sediments were deposited. The erosion of the cordilleras progressed gradually, wearing away the sedimentary cover and exposing the basement complex. The distribution of the exotic material in the stratigraphic series indicates that the cordilleras were mobile, alternately emerging and submerging. This is particularly distinct in the external klippen of the Inwald zone, suggesting that one of the Carpathian cordilleras was better preserved.
Contribution par l'etude des mineraux lourds et argileux a l'interpretation stratigraphique du Quaternaire des Landes meridionales
Authors: Alvinerie J. , Latouche Claude , Thibault Claude 
Published: March 2020

Abstract
Stratigraphic, paleoclimatic, pedological, and archaeological study of cuts in the area of the confluence of the Adour and Midouze rivers defines several Quaternary formations. Analysis of the clay shows a mineralogical break between the lower kaolin-rich beds and the overlying beds rich in illite and interbedded chlorite-vermiculite. This break is described from the Chalosse alluvials and at the base of the Landes eolian sands. Although the suites of heavy minerals are generally homogeneous in these cuts, two zones can be recognized: one by well preserved metamorphic minerals; the other by more resistant minerals that withstood alteration.
Les grandes epoques de fracture et de bombement du Sahara central
Authors: Karpoff Roman 
Published: March 2020

Abstract
A study of the Precambrian massifs of the central Sahara confirms movements of great magnitude in the basement rocks which affected the overlying strata. There were successive readjustments along the faults and reactivation of the folds. The major period of dislocation and deformation of the sediments was the Mesozoic and not the Hercynian. Because of its wide extent this period is called the 'Ramadian movements.' It ended after the lower Eocene and at the time of the Tertiary movements (Timetrinian phase or episode).
Decouverte du genre Amphipora et autres stromatopores dans les formations devoniennes d'Afghanistan central
Authors: Brice D. 
Published: March 2020

Abstract
The genus Amphipora and other stromatopores of the genera Clathrodictyon, Stromatopora, and Stromatoporella occur in Devonian marine limestones at Zard Sang mountain, central Afghanistan. Associated fossils include numerous brachiopods and corals of upper Devonian, probably Frasnian, age. The best specimens, unfortunately, came from loose rocks among which both Frasnian and Famennian elements are present, hence the stratigraphic horizon cannot be assigned precisely.
La cause de l'orientation des mineraux dans les roches metamorphiques
Authors: Goguel Jean 
Published: March 2020

Abstract
The orientation of minerals in metamorphic rocks is postulated as resulting from selective pressure solution, not from rotation, during deformation. The calculations upon which the hypothesis is based are given. If the pressure-solution hypothesis is correct, statistical studies of the distribution of crystal orientations can indicate not only the direction of principal stress but also the relative pressures in different directions.
Sur quelques ammonites du Valanginien de l'Oued Guelta' (Tunisie)
Authors: Memmi Lucia 
Published: March 2020

Abstract
An upper Jurassic and lower Cretaceous sequence in the Guelta wadi basin, northeastern Tunisia, includes a richly fossiliferous marl containing abundant ammonites of the middle Valanginian (lower Cretaceous) Kilianella roubaudiana zone. Berriasellidae occur in great variety; Lytoceratidae and Belemnitidae are represented by only a few individuals. Several ammonites are systematically described.
La presence de Gazellospira torticornis Aymard (ruminant) dans le gisement villafranchien de Saint-Vallier (Drome); essai de repartition geographique et stratigraphique
Authors: Heintz Emile 
Published: March 2020

Abstract
A study of the third lower molar and the second and third upper molars of Gazellospira torticornis found in the Villafranchian (Quaternary) deposit of Saint-Vallier (Drome, France) is presented. Comparison with specimens from Spain indicates a size decrease. Spain and France were two distinct climatic provinces during the Villafranchian, with similar faunas differing from each other only in the frequency of species.
Sur le rapport des gneiss de Bormes et des micaschistes du cap Negre a l'ile du Levant (Var)
Authors: Tanazacq Francois 
Published: March 2020

Abstract
On Levant island (Var, France), south of the Maures massif, anticlinal crests and folds of the Negre Cape mica schist plunge into and under the Bormes gneiss and are clearly visible along the coast. Both the schist and the gneiss have behaved as distinct stratigraphic units, with no evidence of overturning. The Bormes gneiss therefore apparently overlies the Negre Cape mica schist. The feldspars in the entire series are principally detrital.
Ages isotopiques K/A de roches prelevees dans les possessions francaises du Pacifique
Authors: Krummenacher Daniel , Noetzlin Jacques 
Published: March 2020

Abstract
The authors present some forty age determinations made by the K/Ar method on the volcanic rocks of Tahiti and the archipelagoes of French Polynesia by means of a Philips omegatron. The results obtained may be divided grossly into three groups: sub-Recent ages (from 0 to 3 m.y.); Mio-Pliocene ages (about 10 to 15 m.y.) and an age of about 150 m.y., given by a granular inclusion in a nephelinic gabbro-diorite from the center of the island of Tahiti. The last age is particularly interesting because no fossiliferous formations older than Cretaceous are known in the Pacific. These rocks may thus be older and may date at least from the Jurassic. They accordingly pose the problem of the existence, beneath the present volcanoes, of a much older crystalline basement.
Etat actuel des connaissances sur le volcan Niragongo (Republique democratique du Congo)
Authors: Tazieff Haroun 
Published: March 2020

Abstract
The Niragongo volcano of the Congo region is located in the western Great Rift Valley in east Africa. The cone is formed of feldspathoidal lavas containing augite and accessory minerals, and the crater contains terraces representing ancient lava levels. Studies were conducted on the chemical composition and petrography of the rocks, on the chemistry of the gases and sublimates, and on the temperature of the lavas. The magnetic and gravimetric values for the volcano and the area were measured and energy discharge was estimated. The study confirmed the importance of the gaseous phase in volcanic phenomena.
Reflexions sur les types de consolidation des produits du magmatisme crustal superficiel
Authors: Panto Gabor 
Published: March 2020

Abstract
The plutonic and volcanic domains of magmatism are generally regarded as independent; the distinction of typically volcanic igneous formations from all those that were consolidated in the interior of the crust rests generally on purely petrographic criteria. Nevertheless, these criteria alone do not allow precise definition of the depth of formation. Differentiation of volcanic, intravolcanic, and subvolcanic formations can only be based on genetic study of the igneous phenomena within their geologic environment.
L'accident de Gigondas (Vaucluse)
Authors: Demarcq G. , Truc G. 
Published: March 2020

Abstract
In the Gigondas area (Vaucluse, French Alps of Provence), Cretaceous and Burdigalian (Miocene) rocks related to the Suzette massif are thrust northwestward over Tortonian (Miocene) rocks of the Comtat Venaissin basin. This decollement is cut by three fault systems, one oriented north-northeast, one trending east-northeast, and one trending northwest. The pre-Oligocene pyrenean-provencal phase of the alpine orogeny, and the erosion which followed, controlled the future outlines of the decollement. The second, post-Miocene, alpine phase formed the decollement and faults.
Les olistholites du Riou d'Entraix et leur signification paleostructurale
Authors: Artru Philippe 
Published: March 2020

Abstract
The upper Bajocian (middle Jurassic) heterogeneous polygene breccias of the Riou d'Entraix (southeast France) are interpreted as olistostromes formed by gravity sliding along a paleoscarp. The scarp was to the east, in the area presently covered by overthrusts, and separated a euxinic deep basin from a well-oxygenated shallow shelf. Similar deposits in the Barcelonette window and the semi-window at Embrun are probably of the same origin.
Sur l'extension de certains invertebres marins
Authors: Sarkar Satya S. 
Published: March 2020

Abstract
The three large groups considered are the ammonites, trilobites, and graptolites. Curves constructed express variations in the number of genera during the course of time. Most of the paper deals with the Ammonoidea, especially the Indian forms. An attempt to explain the extinction at the end of the Cretaceous involves both environmental changes (shallower seas, sandier deposits) and a phenomenon of overspecialization.
Problemes relatifs a la determination des especes chez les Moorellininae (Thecideidae, brachiopodes)
Authors: Pajaud Daniel 
Published: March 2020

Abstract
The subfamily Moorellininae is revised and Rioultina matisconensis n. gen. n. sp. is described. More than half the Jurassic thecideid species belong to the genera Moorellina Elliott and Rioultina n. gen. Some of the species defined in the 19th century were based on erroneous ideas of specific differentiation, and biometric studies of these species are frequently impossible, which inhibits their clarification. At present it would be as inadvisable to group these former species as it would be to subdivide them or to maintain them provisionally.
Sur la sedimentation et la tectonique du Miocene de la Provence occidentale
Authors: Dubois Paul 
Published: March 2020

Abstract
Two Miocene stratigraphic series are distinguished in western Provence: a marginal series with reduced thicknesses, and a series of subsident type with great thicknesses, denoting synorogenic development of sedimentation in the Miocene of Provence. A description of the effects of the tectonics at the end of the Miocene shows the importance of terminal Miocene folds, asymmetric and slightly overthrust to the south. Their direction of thrust is opposite to the major structures of the region, formed by the Pyrenean-Provencal orogeny.
Especes nouvelles d'inocerames dans le Taurus lycien (Turquie)
Authors: Lefevre Roger , Sornay Jacques 
Published: March 2020

Abstract
An occurrence of inoceramids enclosed within a complex of rudistid limestones of middle Senonian age (upper Cretaceous) in the Lycian Taurus (Antalya province, Turkey) is described. A description of a new species is given: Inoceramus antalyaensis and two associated varieties in this locality.
Les goniatites des argiles viseennes du Mouydir (Sahara central)
Authors: Conrad Jacqueline 
Published: March 2020

Abstract
The discovery of Dimorphoceras gilbertsoni and Beyrichoceras casteltonense in the Dinantian [lower Carboniferous] argillaceous series of Mouydir [Algeria] permits reassignment of these deposits to the upper Visean [upper lower Carboniferous].
Sur la structure du massif du Tribulaun (region de Brenner, Tyrol, Autriche)
Authors: Geyssant Jacques 
Published: March 2020

Abstract
Imbricate structures, phase-two folding (near-horizontal axial planes) with axial-plane schistosity and greenschist-facies metamorphism phase-two refolding (near-vertical axial planes), Jurassic lithostratigraphic units
Borelis melo (Fichtel et Moll) dans le Miocene de la partie orientale des cordilleres Betiques (Espagne)
Authors: Azema Jacques , Fernex Francois , Hottinger Lucas , Magne Jean , Paquet Jacques 
Published: March 2020

Abstract
Foraminiferal-ostracod faunas, species lists, discussion of B. melo (by Hottinger), Puerto Lumbreras-Lorca area, Sierra de Espuna, and northern Fortuna basin
Le copeau jurassique de djebel Tafaroui et l'unite senonienne a 'microbreches' des monts de Tessala (Algerie)
Authors: Fenet Bertrand 
Published: March 2020

Abstract
Jurassic block in Albian-Cenomanian (Cretaceous) nappe partially overlain by Senonian microbreccia, lower Miocene autochthonous? substratum, three-stage emplacement of Jurassic block, upper Jurassic deformation, Triassic diapirism, upper Cretaceous decollement, Miocene imbricate structures
Étude préliminaire de la surface de Vingrau dans les Corbières méridionales
Authors: Cornet Cécile 
Published: March 2020

Sommaire
La surface de Vingrau, qui s'étale, à 300 m d'altitude moyenne à l'E et au S du bassin pliocène de Tuchan, est assez riche en placages de sables argileux (généralement rutilants, parfois jaunâtres) associés à des nodules de limonite. On y trouve également beaucoup de quartz, ainsi que des dépôts de galets et de blocs cristallopylliens, bien roulés, atteignant près de 1 m de grand axe.
L'arasion de la surface s'est effectuée après la phase pyrénéenne paroxysmale et avant le creusement, au Pontien terminal, des canyons sous-marins qui bordent la côte actuelle. Il y a de fortes présomptions pour que le cycle d'aplanissement remonte au Pontien (en tous les cas au Miocène). Quant à l'épandage alluvial des plateaux, il avait sa source au Sud ou Canigou) et il est à rapporter soit à cette même époque, soit au Pliocène.
Tectonique des extrémités de la chaîne des Babors (Algérie)
Authors: Caire André , Coutelle Alain , Obert Daniel 
Published: March 2020

Sommaire
Dans les Babors extrême-orientaux et extrême-occidentaux, le style tectonique n'est pas, comme on l'admettait souvent, de plis extrusifs associés à des intrusions triasiques, ni de chevauchements locaux et limités. Le trait majeur de la structure consiste en recouvrements dont l'ampleur atteint plusieurs dizaines de kilomètres.
Les Babors orientaux peuvent être divisés horizontalement, en trois zones E-W, et verticalement en : 1) un parautochtone (autochtone relatif par rapport à l'allochtone franc, allochtone vers le Sud par rapport à la patrie de la lame B 1) qui déborde sur le Tell nordsétifien 2) un allochtone franc, décollé sur le Trias, composé de Mésozoïque et de Miocène, et qui se développe sur une distance méridienne d'au moins 25 km. Cet ensemble est recouvert par du matériel ultra-baborien : lame de type B 2 (unité épitellienne) et flyschs (unités de Guerrouch, numidienne, etc.).
Les Babors d'Akbou montrent : 1) un soubassement (Trias à Cénomano-Turonien) déplacé vers le Sud, avec plissement, schistosité et écaillage du Jurassique, les écailles les plus tardives étant poussées vers l'Est ou le Sud-Est; 2) une nappe sénono-éocène de type 132, venant de la zone de la Basse-Soummam ; 3) un couronnement allochtone de flyschs (surtout Numidien).
Le soubassement des Babors d'Akbou est l'équivalent latéral, par rapport aux nappes plasliques surincombantes, de l'allochtone franc et du parautochtone des Babors orientaux. Tous les grands recouvrements vers le Sud datent du Miocène I. Les unités 1 et 2 des Babors orientaux et des lfabors d'Akbou sont caractérisées par un Sénonien conglomératique, et font partie de la zone intermédiaire. Elles n'ont rien d'autochtone. Cependant, nous continuerons à qualifier l'unité 1 de parauchtone, car c'est la portion dn Tell algérien qui semble le moims déplacée.