bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dosage du potassium, de l'uranium, du radium et du thorium, par spectrometrie gamma dans les laves d'Auvergne, du Velay et de la province sicilienne
Authors: Cheminee Jean Louis , Nordemann Daniel 
Published: June 2020

Abstract
Fifty samples of volcanic rocks from south-central France, ranging from basalts to rhyolites, were subjected to gamma spectrometry analysis for the purpose of determining the proportions and relationships of the constituent radioactive elements. Zircon, sphene and apatite generally contained less thorium and uranium than the less abundant accessory minerals such as allanite, monazite and xenotime. Results of the analysis also show that the percentage of radioactive minerals is greater in the acidic lavas than in the intrusive rocks, suggesting that the latter were subjected to hydrothermal alteration. The percentage of potassium varies in direct proportion to the variation in the percentage of silica. The increase in thorium as a function of silica is more rapid than that of uranium. Graphically, no correlation exists between the percentage of radium and silica. The concentrations of uranium and thorium do not vary independently but seem to have a statistical dependence whose functional relations are not yet apparent.
Quelques particularites de la partie nord-ouest du volcan cantalien (region des Rhues et de la Sumene)
Authors: Roux Jean 
Published: June 2020

Abstract
The Miocene basalts at the base of Cantal volcano are exposed at approximately uniform heights in the valleys of the area, indicating that there ought to be a branching internal basaltic lava flow with an origin and extent similar to the upper Pliocene basalts of the plateaus. The igneous breccias in the Auzers area exhibit an abnormal thickness of 170 meters. The northwest part of the Moussage lava field, formed of the plateau basalts, is overlain by the Suc du Rond flows indicating that the Suc du Rond basalts, and not those of the plateau, represent the last phase of the Cantal eruption.
A propos de depots du Pliocene superieur et du Quaternaire sur la cote nord de l'ile de Minorque (Baleares)
Authors: Bourrouilh Robert , Magne J. 
Published: June 2020

Abstract
Remnants of upper Pliocene and early Quaternary formations have recently been discovered at the summit of the Atalaya promontory, the easternmost and highest of three promontories on the northern coast of the island of Minorca (Spain). Study of the beds indicates that the underlying Jurassic-Cretaceous formations were abraded and then subjected to karst erosion. The basal bed of the Pliocene-Quaternary sequence is a decalcification clay, the product of the karst phenomena. Overlying the clay is an organic limestone with abundant foraminifera and Microcodium indicative of littoral conditions produced by partial submergence of the northern coast. Two microbreccias, the upper more compact than the lower, overlie the organic limestone and also contain abundant foraminifera. The microbreccias are clearly marine littoral, evenly bedded below, crossbedded above, and the result of submarine currents. A lighter colored limestone petrographically identical to the lower organic bed overlies the microbreccias. Final uplift (probably Recent) produced the existing cliffs and exposed the Pliocene-Quaternary formations. The age of the sequence is tentatively assigned on the basis of the presence of Microcodium.
Nouvelles recherches sur le gisement villafranchien de Seneze (Haute-Loire, France)
Authors: Elha Henri , Grangeon Pierre 
Published: June 2020

Abstract
Examination of a section of the core taken from a boring in the center of the Villafranchian Seneze lake has provided additional data on this classic locality. Variations observed in the pollen content are used to delineate a series of four separate climatic oscillations of alternating temperate and cool periods. The deposits represented in the core were laid down during the Villafranchian in a fresh-water medium as indicated by the presence of pollen from fresh-water aquatic plants and from Botryococcus. Pollen diagrams are included.
La signification climatique fournie par les faunes malacologiques quaternaires en Bourgogne
Authors: Puissegur Jean Jacques 
Published: June 2020

Abstract
An abundant terrestrial molluscan fauna was collected from Genay and Flavigny-sur-Ozerain, Cote-d'Or, France. Both localities are underlain by Bajocian detritus overlying Liassic marls. Three principal faunas are recognized in the Genay deposits. The first fauna is characteristic of temperate conditions. The second fauna contains only a few species all of which show signs of adaptation to difficult conditions: alternating humid and dry periods. The third fauna contains numerous species including forest-dwelling forms, indicating the replacement of the Wuermian glaciation by the Atlantic climate. Other deposits provide similar results, demonstrating the variability and usefulness of molluscan faunas in relation to temperature and humidity.
Nouvel essai de correlation des terrasses rhodaniennes
Authors: Bonnet Andre 
Published: June 2020

Abstract
Reconstruction of the Quaternary terraces of the Rhone (southeast France) reveals three or possibly four levels between the Rhone delta and the Rhone-Drome confluence. The age of the lowest terrace level--best exposed at Valence-Romans and upstream--is questionable. It may represent either the Wuerm or the Riss, or it may be divided between two different stades--neo-Riss and an older stade represented by the Leore-Fouillouse terrace. The middle terrace is Rissian and the highest terrace represents the Villafranchian. This phenomenon of uplifted terraces seems to be related to an isostatic uplift of blocks to compensate for the load of glacial ice. The continuity and extent of this phenomenon would explain the relative positions of the terraces, the older higher than the younger. Cross sections are included which show the recognized terraces. A correlation chart presents the Quaternary stratigraphy of Scandinavia, the alpine regions, the Sahara, central Africa, and Australia, and includes the major archaeological divisions.
La sequence climatique wurmienne du gisement paleolithique de la Salpetriere (Remoulins, Gard)
Authors: Escalon de Fonton Max 
Published: June 2020

Abstract
Stratigraphic study of the prehistoric site in the Salpetriere shelter cave (southern France) has provided information which gives an indication of the Wuerm II-Wuerm IV climatic evolution. The Wuerm II is represented by thermoclastic gravels and eolian sands. Gully erosion on the surface of the uppermost gravel represents the warming trend of the Wuerm II-III interstade. Red sand and gravel in the Wuerm III beds owe their color to a karst clay corresponding to the warm interstade between the Wuerm IIIa and b. The Lascaux interstade between the Wuerm III and Wuerm IV is represented by eolian sands badly eroded by trenches and gullies. Gravelly sands in the upper beds of the Wuerm IV form talus deposits which represent cooler, less humid conditions. Another gravelly sand which overlies the Wuerm beds represents two phases of the Dryas II--a cool, dry phase followed by a phase of increasing humidity. Remnants of upper Paleolithic industries are also described.
Correspondance entre les couples erosion-sedimentation et pluvial-aride au Sahara nord-occidental
Authors: Chavaillon Jean 
Published: June 2020

Abstract
A climato-sedimentologic cycle is proposed on the basis of Villafranchian deposits in the northwest Sahara. The relationship between the erosion-sedimentation cycle and the pluvial-arid cycle is shown. The stratigraphy and sedimentation of the material composing the terrace deposits show an evolution toward increasing aridity, beginning with gravel deposits of a fluvial character and progressing toward typically arid sediments. The proposed cycle begins with a period of maximum aridity during which massive dunes cover the ancient terraces and hamadas, and debris from gravity erosion accumulates in cones. In the arid-pluvial transition period, humidity gradually increases, causing erosion of the slopes and debris cones. Maximum erosion occurs in the pluvial period. In the pluvial-arid transition period, sedimentation is at first fluvial, involving coarse-grained material, then loamy, and finally eolian. Lacustrine levels, crust formations and secondary rhythms are also recognized and briefly described. This cycle is confirmed by the prehistoric civilizations from the Pebble Culture to the Neolithic.
Age et position des calcaires de Saint-Jean-de-la-Riviere dans le Cambrien des Moitiers d'Allonne (Manche)
Authors: Dore Francis 
Published: June 2020

Abstract
The type section for the Saint-Jean-de-la-Riviere limestone outcrops on the Moitiers d'Allonne anticline in the Douits valley north of Carteret and east of Moitiers (France). The limestones are younger than the sandy shale of the Cap Carteret series and between Moitiers and Bosquet the sequence is overlain by shales and red sandstones separating it from the Armorican sandstones. The lower Cambrian of the area presents a complete sedimentary section ending with a red sandstone facies of a regressing sea. A significant hiatus is evident before lower Ordovician transgression and continued deposition. Hyolothides and sponges, believed to be Azoic (early Precambrian) and older than Archaeocyathidae and Bigotina, are found in calcareous sandstone nodules on the beach at Carteret.
Essai sur la paleogeographie post-triasique et l'evolution secondaire et tertiaire du versant sud des Alpes orientales (Alpes meridionales; Lombardie et Venetie, Italie; Slovenie occidentale, Yougoslavie)
Authors: Aubouin Jean 
Published: June 2020

Abstract
The southern Alps are divided into five distinct zones formed during the geosynclinal stage: the Lombardian depression, the Tridentine ridge, the Belluno depression, the Friuli ridge, and the Julian depression. Transition zones can be defined between the units. Late geosynclinal deposition (Miocene) is best represented in the Friuli ridge zone. Post-geosynclinal deposition corresponding to Pliocene-Quaternary deposits is equivalent to that of the Po river plain. Geosynclinal and late geosynclinal evolution was marked by folding perpendicular to earlier tectonic trends. Post-geosynclinal folding (Pontian to Pliocene) was oblique or perpendicular to the preceding structural patterns. A correlation is made between the southern Alps and the Italian Dinaric Alps north of Lombardy and Venice; the geosynclinal deposits are correlated with the Dinaric molasse sequence; and post-geosynclinal events are related to the Po plains. It is believed that the eastern Alps are the 'true' Alps whereas the western Alps are a part of the Italian Dinaric Alps.
Etude geologique de la region de Castello-Tesino (Alpes meridionales, province de Trente, Italie)
Authors: Rasplus Leopold 
Published: June 2020

Abstract
The sedimentary series of the Castello-Tesino region in the eastern Venetian Prealps comprise a sequence of marine rocks ranging in age from the Liassic to Miocene. The Liassic gray limestones and the Dogger ooelitic limestones are neritic or subreefal deposits. The Malm and the Cretaceous deposits indicate a deepening of the sea. The Eocene and Oligocene facies are more terrigenous, but in the Lutetian, Priabonian, and Oligocene become littoral. The Miocene marks the transgression of a neritic sea indicated by the accumulation of a slightly discordant molasse sequence. The folds trend in a WSW-ENE direction. The stratigraphy and paleogeography indicate that the region belongs to the Belluno zone between the zone of Friuli to the east and the zone of Trento to the west.
Description d'une succession lithologique avec niveaux-reperes dans les schistes cristallins des Cevennes pres de Villefort (Lozere)
Authors: Brouder Paul 
Published: June 2020

Abstract
In the Villefort region of south France, crystalline schists are inclined along a fold trending northeast-southwest and overturned toward the northwest. The series is composed of conglomeratic gneiss and mica schist. Distinct horizons of amphibolite, quartzite, mispickel gneiss, and zoisitic gneiss are included. Many of these beds are persistent and valuable on a regional scale as marker horizons.
Le Cambrien et la base de l'Ordovicien dans la partie orientale et meridionale du Tafilalt (Maroc)
Authors: Destombes Jacques 
Published: June 2020

Abstract
A recent structural study of the Tafilalt area (Morocco), including a correlation study between the El-Aness and Ouzina sections, showed that the Cambrian units at the two localities are correlative and can be divided into two series--the Georgian series characterized by detrital material and arkosic beds, and an upper Acadian series which is thicker than the lower series. The lower Ordovician is characterized by a red sandstone horizon representing the upper Tremadoc transgression, and overlain by the lower Arenig series of green shales with graptolites. Between the Arenig and Tremadoc is a green glauconitic bed. It can be deduced that deposition decreased from south to north during Acadian and Georgian time. The seas did not reach the El-Aness massif during the Tremadoc but only during the lower Arenig.
Remarques sur Posidonomya dalmasi Dumortier du Jurassique de l'Ardeche
Authors: Freneix Suzanne 
Published: June 2020

Abstract
The pelecypod species Posidonomya dalmasi which was previously considered a synonym of Posidonomya ornati is now assigned to the genus Silberlingia on the basis of material collected from the Privas mines (France). The range of Silberlingia is therefore extended into the Callovian.
Observations sur le subbetique au sud de Calasparra (prov. de Murcie, Espagne)
Authors: Paquet J. 
Published: June 2020

Abstract
The Subbetic group, along the Calasparra meridian between the autochthonous Prebetic to the north and the basal Triassic of the Subbetic to the south, is divided into seven tectonic units. The Prebetic is characterized by continental, lagoonal, and neritic facies. The Puerta unit consists of Tertiary facies intermediate between the Prebetic and the Subbetic units to the south. The Los Rameles unit--northernmost Subbetic--consists of Jurassic-Eocene facies, the Cretaceous and Tertiary units being intermediate between the Puerta and Loma de Solana units. In the Loma de Solana unit (Jurassic-Oligocene) the Malm contains red bedded nodular limestones passing into upper Oxfordian and Tithonian marls. The Sierrecica de las Cabras unit contains Neocomian and Barremian beds which overlie the basal Triassic and underlie the Loma de Solana unit. The Sierra de Burete unit contains Jurassic-Paleogene beds intermediate between the Loma de Solana and Sierrecica de las Cabras units. The Sierra de Ponce unit contains Jurassic-Miocene strata representing the southern Subbetic. The recognition of these units makes it necessary to abandon the terms northern and southern Subbetic in this area.
Position stratigraphique des phosphates en Syrie
Authors: Atfeh Seifuddin A. , Faradjev Vladimir A. 
Published: June 2020

Abstract
Hydrologic investigations and field reconnaissance for the 1:50,000 scale map of Syria provided more detailed information on the exact stratigraphic position, quality, and extent of the phosphate deposits. The deposits are found in strata of Santonian through Eocene age, as well as in Holocene deposits in the southern part of the region. Santonian phosphates are limited to the central part of the southern Palmyride chain. Campanian phosphorites are well-developed and represented by rocks primarily composed of calcium phosphate. The major Maestrichtian phosphate deposits occur in the southern Palmyrides. Lower Danian phosphate is known only in the Ghadir el-Hamal. Paleocene phosphates are found on the flank of Mount Abou Rabah and Jabal Ash-Sheikh. Middle Eocene phosphorites are found in thin, localized bands, and in carbonate and glauconite beds. Upper Eocene phosphorites also occur in the southern Palmyrides. Holocene phosphates are represented by phosphatized bone accumulations.
Les Ceriopora neogenes (Bryozoaires cyclostomes) de la collection Michelin
Authors: Fischer J. C. , Buge Emile 
Published: June 2020

Abstract
The discovery and subsequent reexamination of the holotype and paratypes of Chaetetes pomiformis Michelin show that the specimens can be divided among three species, all of which are here described and figured: Ceriopora balavoinei Buge (=Chaetetes pomiformis), Ceriopora tumulifera (=Chaetetes pomiformis var. mamillosa), and Ceriopora hardouini n. sp. The new species was collected from the Tortonian of Vaucluse (France), and is characterized by the complete lack of diaphragms.
Contribution a l'etude seismologique du volcanisme de l'Herault et des Causses
Authors: Allegre Claude , Doussaint Louis , Mechler P. , Proust Francois 
Published: June 2020

Abstract
An initial series of experiments was made concerning seismic reception in the Languedoc region of southern France. The M-discontinuity is at relatively shallow depth (25 km) beneath these old volcanoes. Basalt is at 19 km depth. Some relationship may exist between this region of crustal thinning and the crystalline axes of Montagne Noire and the Pyrenees.
Observations sur les formations du continental terminal et du Quaternaire dans le bassin du Logone (Tchad)
Authors: Bouteyre G. , Cabot Jean , Dresch Jean 
Published: June 2020

Abstract
The rock series in the Logone and Lame basins in the southern Sahara is a crystalline basement complex, a series of Mesozoic formations culminating in the Benoue marine Cretaceous transgression in the western part of the region, the Pala and Kelo sandstone with lateritic zones, and Quaternary surficial deposits. The Mberi-Begangber-Koro erosion surface of Villafranchian (?) (late Pliocene) age is prominent in the region.
Elimination des produits d'alteration des roches anciennes avant leur examen en lames minces
Authors: Boyer Claude , Brousse Robert 
Published: June 2020

Abstract
There are several promising methods of removing alteration products from thin sections of rocks. The reagents used are hydrochloric, sulfuric, and nitric acids, distilled water, and oxygenated hot water. Some methods result in decreased clarity, but others suggest that further refinements may yield excellent results. Particularly good results are obtained with ferruginous pigmentation subjected to hydrochloric acid.
Les nappes alluviales des cours fossiles du Gave de Lourdes dans leur partie aval
Authors: Alimen H. , Maggion Roseline 
Published: June 2020

Abstract
The downstream portions of the Quaternary terraces of the Gave de Lourdes river, Hautes-Pyrenees, southwestern France, are assigned Donau, Guenz, and Mindel age on the basis of their respective positions, their continuity with the dated Bigorre terraces, the nature of their paleosols, and the petrographic characteristics of their cobbles.
Existence de filons ignimbritiques au sud de la caldera de Maure-Vieille, Esterel oriental (Alpes-Maritimes)
Authors: Boucarut Marc 
Published: June 2020

Abstract
The southern flank of the Maure-Vieille caldera of the Esterel massif of the Maritime Alps in southeastern France is remarkable for the large number of ignimbrite dikes in the series of alternating sedimentary and volcanic rocks of Permian age. Three types of dikes occur. The first is a rhyolitic rock poor in quartz and sanidine phenocrysts, but with abundant oriented laths consisting of a spherulitic quartz-potassic feldspar nucleus enclosed in an aureole of feldspar dusted with iron oxide. These 'fiammes' are devitrified fragments of pumice. The second type is of similar material but is brecciated in fragments cemented by a rhyolitic matrix. The third type is vitroclastic in structure with iron oxide inclusions, but completely devitrified. The rhyolite of the area is the same chemically as the ignimbrite, and the dikes of ignimbrite represent pyromagmatic fragmentation occurring in the conduits through which the rhyolite was erupted.
Sur la presence d'algues calcaires dans le Carbonifere de differents bassins sahariens (Colomb-Bechar, Reggane, Polignac)
Authors: Chanton Nicole 
Published: June 2020

Abstract
Marine Carboniferous algae in the Colomb-Bechar, Chebbi, El Ahmar, Ohanet, and Polignac basins of the Sahara are present in greater numbers than had been supposed. Although they are good facies indicators, they are not suitable for regional zonation, and their stratigraphic value is very limited. Dasycladaceae of the genera Anthracoporellopsis, Koninckopora, and Macroporella, and Rhodophyceae of the genus Petschoria are numerous. The genera Anthracoporellopsis and Petschoria elsewhere are known only in the Ural region of the USSR. Koninckopora and Macroporella are known from various parts of Europe, Asia, Africa, and America.
Caracteres generaux de la biogeographie de l'U.R.S.S. pendant la periode carbonifere
Authors: Einor O. L. , Voynovskiy-Kriger K. G. , Vasilyuk N. P. , Vdovenko M. V. , Gorak S. V. , Dunayeva N. N. 
Published: June 2020

Abstract
Analysis of the geographic extent of faunas in the Carboniferous seas of USSR has provided general characters for defining biogeographic provinces in the area. Two provinces are distinguished in the lower and middle Carboniferous seas. The Europe-Tien Shan province is divided into regions including the Ukraine-Donets, eastern USSR, Ural, Transcaucasus, and Tien Shan regions. The Kazakhstan-Siberia province includes the regions of Kazakhstan, Altai, Kuznetsk basin, Transbaikalia, Taimyr, Kolyma-Koryak, Mongolia, Sikhote-Alin. In the upper Carboniferous, following a major regression, the differences between the marine faunas of Europe and Central Asia increased to such a degree that the corresponding basins must be considered independent provinces--eastern Europe, Tien Shan, eastern Siberia, and the Pacific Ocean. The data presented are based on published material.
Variations de teneurs en Cu, Ni, Cr, Co et V dans quelques roches volcaniques des Causses et du Bas-Languedoc
Authors: Dupuy Claude 
Published: June 2020

Abstract
Fourteen samples from the Causses and Bas-Languedoc volcanics, including a peridotite nodule, basaltic lavas, and pegmatoids, have been submitted to geochemical analysis for the first time, in order to determine the distribution of Cu, Ni, Co, and V. In the rocks studied, these elements decrease in percentage during the course of differentiation with the exception of Cu, whose percentage is not affected. The decrease of the Ni/Co ratio to below 1 suggests that Ni was removed more quickly from the magma than was Co. Median percentages calculated for the basalts indicate that the presence of olivines is accompanied by a marked enrichment of Ni, Co, Cr, and Cu.
Apercu general sur les depots eocenes de la Belgique
Authors: Gulinck Marcel 
Published: June 2020

Abstract
Tertiary sedimentation in the Belgium basin began with the Montian. The Heersian is retained as a separate stage to include provisionally the Gelinden marls and the Infraheersian. This recommendation is based on the unique paleontologic character of the stage and its complete separation from the overlying Landenian shales. The Eocene developed to its greatest extent during the Landenian with the successive deposition of shales, silts, tuff, sands, marls and lignites. The Ypresian-Landenian boundary is defined by the first appearance of marine facies above Landenian fluviomarine deposits. The Panisilian may need revision as it now includes Nummulites planulatus. The hiatus between the overlying Bruxellian and the Ledian is not as significant as first thought since the Ledian is correlated with upper Lutetian in the Paris basin. The Bartonian immediately succeeds the Ledian. The Tongrian in northern Belgium is not a lateral equivalent of the Bartonian.