bluuebunny/crossref_metadata_2025_split huggingface dataset:
Les phosphates du Sahara soudanais
Authors: Karpoff Roman , Visse L. 
Published: June 2020

Abstract
Two phosphate beds recently discovered in the Sudan region, French West Africa, represent beds formed in Paleocene or early Eocene time, which have subsequently been partly removed by erosion. They are rich in coprolites and bone debris. Because of a high content of aluminum, iron, and manganese the occurrences are not commercial deposits; the coprolitic elements may warrant exploitation, however.
Contribution a l'etude de Clypeina jurassica J. Favre (algue siphonee calcaire), d'apres de remarquables echantillons du Jurassique d'Algerie
Authors: Morellet Jean 
Published: June 2020

Abstract
Gives a detailed description of the calcareous alga Clypeina jurassica, on the basis of specimens from Jurassic deposits of Algeria from which the matrix could be removed.
Tableau de correlation des formations pliocenes et quaternaires ouest-mediterraneennes, europeennes atlantiques et nordiques
Authors: Chavan Andre 
Published: June 2020

Abstract
Comments on the accompanying correlation table showing the subdivisions of the Quaternary and uppermost Pliocene of the west Mediterranean and the west and north European regions, compiled on the basis of stratigraphic evidence and marine faunas rather than on glaciologic, purely stratigraphic, or continental faunal criteria.
L'evolution structurale de la region de Miliana (Algerie) et le style amygdalaire des chaines liminaires
Authors: Caire Andre , Glangeaud L. , Mattauer M. 
Published: June 2020

Abstract
An outline of the tectonic history of the Miliana region, Algeria, with special reference to the superposition of structures produced during recurrent dislocation and the development of anticlinal structures in marginal continental zones.
Reflexions et discussions a la suite des recents travaux sur les feldspaths
Authors: Perrin Rene , Roubault M. 
Published: June 2020

Abstract
Recent investigations on albite and the albite-orthoclase system, particularly those of Bowen and Tuttle, are reviewed. The overall results indicate a low temperature of formation for plutonic rocks and pegmatites, a fact which is difficult to reconcile with the magmatist viewpoint. It is considered unlikely that granites could be so uniform in structure if formed in two such different manners as by crystallization from magma and by granitization. Since indubitable examples of granite formed by recrystallization in the solid state are recognized by all, it is concluded that all granites must be formed in that way.
Sur la geologie quaternaire des iles d'Hyeres
Authors: Bourcart Jacques 
Published: June 2020

Abstract
Describes early Quaternary (Tyrrhenian?) cemented beach and dune sands, eroded and overlain by red clays, which are found on three of the Hyeres islands (Levant, Port Cros, and Porquerolles), southeast France, and reconstructs the Quaternary history of the region.
Observations geologiques dans la region d'Ouro Preto (Minas Gerais, Bresil)
Authors: Brajnikov Boris 
Published: June 2020

Abstract
Mountain ridges of Precambrian sandstone or quartzite in the Ouro Preto region of Brazil follow three principal directions. It is not yet clear whether these formations represent the lower Algonkian Minas series or the middle Algonkian Itacolomi series. The regional structure consists of a crystalline core overlain by phyllites and quartzites. The sedimentary cover has been sheared along with the core and, caught up in movements of isolated blocks of the core, subjected to more or less intense local displacement and folding. The result is a checkerboard of faulted segments. The topography is primarily determined by the structure, with erosion effects of secondary interest.
Sur les gisements a spongiaires siliceux du Jurassique superieur francais
Authors: Lagneau-Herenger Lucette 
Published: June 2020

Abstract
A summary of present knowledge of occurrences of siliceous sponges in the upper Jurassic of France. Lists of sponges from new localities in Ardeche, Savoie, and Poitou, and descriptions of two new species of hexactinellids are included. A table giving the distribution of species among the various localities shows that the Jurassic sponge fauna of France is very homogeneous.
Etude d'un nouveau gisement de plantes fossiles tertiaires et de quelques nouvelles especes decouvertes a Ceyssac
Authors: Grangeon Pierre 
Published: June 2020

Abstract
A description of the Crozas Tertiary flora, found in a cave in volcanic breccia in the valley of the Dolaizon, a small tributary of the Borne river, France. The cave is located about two kilometers from the Ceyssac fossil plant locality. Stratigraphic, paleobotanic, and paleontologic evidence all point to a pre-Villafranchian Tertiary age. The plants indicate a warmer, more humid climate than that of the present.
Sur une pegmatite a amazonite du Tibesti
Authors: Jeremine Elisabeth , Lelubre M. , Sandrea A. 
Published: June 2020

Abstract
An amazonite-bearing pegmatite mapped in the Dohona massif in the northeastern Tibesti mountains, French Equatorial Africa, is composed essentially of quartz with both amazonite and pink microcline, the latter perthitic, and accessory muscovite, topaz, and fluorite. To explain the presence of the two forms of microcline (which show identical composition upon spectral analysis), it is suggested that two phases are represented, one following closely upon the other. In the one, not all the equilibrium conditions for formation of pure microcline were present; the perthitic pink variety formed as a result of the tendency of soda (albite) and iron to exsolve. In the other, more stable phase the homogeneous amazonite crystallized. The sequence of the phases has not been determined.
Observations sur la bordure occidentale de la Bresse, region de Pont-de-Vaux (Ain)
Authors: Russo Philibert 
Published: June 2020

Abstract
Presents data on the distribution of the Pliocene and Quaternary in the western part of the Bresse region, France, obtained from 40 well borings, ranging from 7 to 17 meters in depth, in the vicinity of Pont-de-Vaux. Valleys cut in the Plaisancian (lower Pliocene) blue clays during later Pliocene times are filled with Quaternary deposits. The changes in level causing dissection and filling seem to have been produced by tectonic processes associated with the Alpine crustal movements, which caused subsidence in the west-central part of the region and uplift in the south, rather than by eustaticmovements.
Les liogryphees du Jurassique inferieur de l'est du Bassin parisien
Authors: Charles Robert P. , Maubeuge P. L. 
Published: June 2020

Abstract
Describes and illustrates all the forms of the pelecypod Liogryphaea known from the lower Jurassic of the eastern Paris basin, France, including two new species and four new varieties. The phylogenetic relationships of the group are discussed and illustrated in a table.
Sur deux especes d'ammonites inedites de d'Orbigny et sur une espece nouvelle du tuffeau de Touraine
Authors: Sornay Jacques 
Published: June 2020

Abstract
Most of the 11 upper Cretaceous ammonites in the d'Orbigny collection, for which no descriptions were published, correspond to forms since described by others, but two seem to represent new forms which should be preserved: Ammonites combesi and A. canthus, belonging to the genera Mammites and Prionotropis, respectively. A related species, P. turoniensis n. sp. from the Touraine region, France, is described from a specimen in the Peron collection.
Structure et evolution de la zone sub-bibanique dans la region de Mansourah-les-Biban (departement de Constantine)
Authors: Caire Andre 
Published: June 2020

Abstract
Discusses and illustrates schematically the evolution of the complex structure of the sub-Bibanic zone in the Mansourah-les-Biban region, which lies between the Biban and Mansourah ranges in Constantine department, Algeria. Older layers have been overturned and thrust southward in successive stages on top of Miocene beds, the whole being further complicated by warping.
Interpretation tectono-physique des caracteres structuraux et paleogeographiques de la Mediterranee occidentale
Authors: Glangeaud Louis 
Published: June 2020

Abstract
The structural evolution of the western Mediterranean region cannot be explained on the basis of any single category of physical processes, such as continental migration or subcrustal convection currents, but by action of several processes, whose individual roles varied with time and place. Four stages are distinguished in the structural evolution--disjunction leading to separation of the "Mediterranean mosaic" into several fragments at the close of the Paleozoic and the beginning of the Mesozoic; monoliminary (autonomous) evolution of the border of certain of these fragments during the Mesozoic; diastrophic activity in middle Eocene to upper Oligocene time, during which the blocks of the mosaic were squeezed between Europe and Africa; Miocene to Plio-Quaternary phases of relaxation, accompanied by isostatic readjustment and subcrustal flow.
Especes nouvelles de Rhynchonellidae du Lias
Authors: Drot Jeannine 
Published: June 2020

Abstract
Describes five new brachiopods of the family Rhynchonellidae, on the basis of material from Liassic localities in the Nancy region, France-- Rhynchonella aviasi (upper Hettangian), Piarorhynchia? roubaulti (upper Hettangian and lower Sinemurian), Scalpellirhynchia remyi (Lotharingian), Cymatorhynchia milloti (upper Aalenian), and Curtirhynchia arambourgi (upper Aalenian).
Contribution a l'etude paleoxylologique de l'Afrique du nord (IV); sur un echantillon de Brachyoxylon (Telephragmoxylon) du Jurassique moyen de Tunisie
Authors: Boureau Edouard 
Published: June 2020

Abstract
Describes a specimen of silicified araucarian wood (Brachyoxylon (Telephragmoxylon) brachyphylloides) from middle Jurassic deposits near Tatouine, Tunisia, representing a very rare mixed lignitic type, heretofore known only from the Comanchean of Texas.
Deux applications de criteres geometriques a la determination du mode de genese de filons de pegmatite [with discussion]
Authors: Perrin Rene , Roubault M. 
Published: June 2020

Abstract
Gives two examples, from Finistere (France), of the application of geometric criteria to determination of the origin of pegmatite veins. Both are cases where well-developed networks with parallel borders are nevertheless interpreted as being of replacement origin. Critical comments by various colleagues and authors' rebuttal are appended.
Etude petrographique et mineralogique des sediments meubles de la region de Salles (Gironde)
Authors: Seronie-Vivien Roger 
Published: June 2020

Abstract
A petrographic and mineralogic study of the detrital formations of the Salles region in the Aquitaine basin, France, which include Miocene (Helvetian), Pliocene, and lower and upper Quaternary beds. The sandy formations of each stage are very homogeneous, from the granulometric as well as the mineralogic point of view. Four phases of sedimentation are indicated by statistical study of the heavy minerals; thus the stratigraphy can be defined solely by means of petrographic criteria.
Quelques observations petrographiques sur le NW du massif de Levezou (Aveyron)
Authors: Collomb Pierre 
Published: June 2020

Abstract
The metamorphic series of the northwestern Levezou massif, Aveyron, France, is characterized principally by enrichment in silica and potash. This enrichment (possibly due to concentration of femic elements in small lenses in the migmatites) is not uniform, but is always present, both in the mica schists and paragneisses, which grade into migmatites, and in the greenstones bordering the migmatite massif.
Usure et fragmentation des calcaires jurassiques de la region de Bourges (Cher)
Authors: Bouillet Genevieve 
Published: June 2020

Abstract
Field and laboratory study of the mechanical weathering of Jurassic limestones of the Bourges region, France, by continental and fluviatile agencies leads to the conclusion that the present topography was developed mainly in Quaternary times, under periglacial humid climatic conditions.
Etude de quelques nerinees et milioles du Cretace inferieur des monts du Hodna
Authors: Glacon Georgette , Glacon J. 
Published: June 2020

Abstract
Describes seven species of the gastropod Nerinea--six Aptian, one doubtfully Albian (Cretaceous)--from the Hodna mountains in the vicinity of Ampere, Constantine, Algeria. Several have not heretofore been reported from north Africa. The cavities in these specimens, which are mostly internal molds, are filled with limestone containing a Miliola microfauna.
Repartition des gisements de vertebres et d'invertebres actuellement connus dans le "continental intercalaire" du Sahara
Authors: Lapparent Albert F. de 
Published: June 2020

Abstract
Lists the faunas of the known vertebrate and invertebrate localities in the Continental intercalaire formation of the Sahara. Further research on their distribution with respect to ancient massifs should throw light on the Cretaceous paleogeography of the region.
Le contact Jura-Bresse dans la region de Lons-le-Saunier
Authors: Michel Pierre , Appert George , Bonte Antoine , Lavigne Jacques , Lefarrais Andree , Lienhardt Georges , Ricour Jean 
Published: June 2020

Abstract
New information from borings shows that in the region to the west and north of the Lons-le-Saunier basin, France, the Jura border is thrust over the Tertiary of the Bresse region. The age of the movement is post-Pontian, and the amplitude over five kilometers at certain points. The movement occurred along gypsum and salt zones in the lower Keuper and Muschelkalk (Triassic) without disturbing the underlying Triassic, Permian, and Carboniferous beds.
Variation des facies jurassiques entre Neufchateau (Vosges) et Chatillon-sur-Seine (Cote-d'Or)
Authors: Stchepinsky Vladimir 
Published: June 2020

Abstract
Outlines the middle and upper Jurassic history of the Morvan-Vosges strait in the region between Neufchateau (Vosges) and Chatillon-sur-Seine (Cote-d'Or), France, as deduced from vertical and horizontal variations in facies. Tectonic activity in the Vosges and Morvan massifs does not seem to have been simultaneous.
Les formations littorales anciennes du Ri pres de Douarnenez (Finistere) [with discussion]
Authors: Giot P. R. , Guilcher Andre 
Published: June 2020

Abstract
A study of a littoral formation, a marine sand cemented by limonite, which occurs in the Ri beach region, near Douarnenez, Finistere, France. The ferritization and consolidation seem to have been caused by the action of local springs and influenced by the position of the formation along the shore. The age is probably Normanian (early Quaternary).
Sur la presence du genre Coahuilites Boese 1927 dans le sud tunisien et du genre Eulophoceras Hyatt 1903 dans le Proche-Orient
Authors: Basse Eliane 
Published: June 2020

Abstract
An upper Cretaceous ammonite from southern Tunisia, previously assigned to Coilopoceras (a middle Cretaceous genus) and Eulophoceras (Santonian-Campanian) is identified as belonging to Coahuilites (a Maestrichtian genus).
Brachiopodes du Cretace des confins algero-tunisiens
Authors: Drot Jeannine 
Published: June 2020

Abstract
Lists Cretaceous brachiopods from localities in the Algerian-Tunisian border region, with data on their stratigraphic distribution and occurrence, and describes a new species, Neoliothyrina? getulina, from the lower Gargasian.
La structure du massif du Canigou; apercu sur le metamorphisme regional dans la zone axiale des Pyrenees orientales (note preliminare) [with discussion]
Authors: Guitard Gerard 
Published: June 2020

Abstract
Preliminary report on the structure of the Canigou massif in the eastern French Pyrenees; deals principally with the effects of regional metamorphism in the development of the Hercynian (Paleozoic) migmatites forming the massif.
Essai de coordination de l'autochtone et de l'allochtone dans l'Atlas tellien de l'Algerie centrale
Authors: Caire Andre , Mattauer Maurice , Polveche Jean 
Published: June 2020

Abstract
Describes in some detail the large-scale structural units of the Atlas ranges of central Algeria. Correlations between the southern and northern ranges and the chronologic development of the sedimentary cover and its deformation into nappes are discussed.
Les terrasses quaternaires de la vallee de l'Huveaune (Bouches-du-Rhone)
Authors: Bonifay Eugene 
Published: June 2020

Abstract
Describes the three principal sets of terraces developed in the Huveaune valley, near Marseilles, France, the youngest of which corresponds to the Wuerm (Pleistocene) stage. These terraces were developed during the course of a torrential regime and thus were extremely sensitive to slight climatic variations. They therefore reflect the general paleoclimatologic conditions which obtained in lower Provence at the end of the Quaternary.
Flore et stratigraphie du terrain houiller de la region de Lons-le-Saunier (Jura)
Authors: Greber Charles 
Published: June 2020

Abstract
Lists the most characteristic Stephanian plants found in borings in the Carboniferous coal-bearing formations of the Lons-le-Saunier region, France. In some boreholes lower and middle Stephanian floras could be distinguished. The transition between them is gradual because sedimentation was continuous, and no definite boundary could be established. The middle Stephanian is more extensive, as in the coal basins of the Central Massif. Transgression in the region seems to have been toward the north.
Existence de cirripedes acrothoraciques des le Lias; Zapfella pattei nov. gen., nov. sp
Authors: Saint-Seine Roseline de 
Published: June 2020

Abstract
An account of acrothoracic cirripeds from several zones in Liassic, Jurassic, Cretaceous, and Miocene localities of France. It is tentatively concluded that a considerable variation in abundance has taken place. During the Liassic, late Cretaceous, and Miocene, conditions were more favorable for their existence than at present. A description of Zapfella pattei n.g. n.sp. is included.
Colorimetrie de sediments quaternaires et paleoclimats; premiers resultats [with discussion]
Authors: Alimen Henriette 
Published: June 2020

Abstract
Paleoclimatic conclusions are drawn from color variations in Quaternary sediments and fossil soils in the central French Pyrenees. They agree with results of similar observations in different parts of France. During glacial and interglacial fluctuations, the Quaternary climate of France became increasingly cold and reached a maximum in the Wuerm.
Limites dimensionnelles et noms des fractions granulometriques
Authors: Cailleux Andre 
Published: June 2020

Abstract
Statistical study of all proposed granulometric classification systems shows that the one which stands the best chance of being adopted universally is Atterberg's, which places the limits of the various grain-size groups at 200, 20, 2, 0.2, 0.02, and 0.002 mm.
Les phases du metamorphisme en Rouergue
Authors: Collomb Pierre 
Published: June 2020

Abstract
Two distinct phases of general metamorphism are recognized in the crystalline rocks of the Rouergue region, France. Ectinites and migmatites were produced during the earlier phase. The later phase was essentially one of retrograde metamorphism. Tectonic stages associated with the metamorphic phases are represented by axial trends of N. 75 degrees W. and N. 15 degrees W. respectively.
Etude de la partie occidentale du massif de l'Aston, Ariege
Authors: Destombes Jean Paul , Raguin Eugene 
Published: June 2020

Abstract
The migmatites of the eastern part of the Aston massif, in the axial zone of the Pyrenees in Ariege, France, are metamorphosed lateral equivalents of the Paleozoic formations of the Vicdessos area, from which they are separated by an anticline.
Etude des orthophragmines contenues dans les marnes a Xanthopsis dufourii (Lutetien inf.) de la chalosse de Montfort (Landes)
Authors: Neumann Madeleine 
Published: June 2020

Abstract
Describes an orthophragmine foraminiferal fauna (including Discocyclina trabayensis n.sp.) from lower Lutetian (Tertiary) Xanthopsis durourii-bearing marls which outcrop on the southern flank of the Audignon ridge and, farther west, on the flanks of the Louer dome, Aquitaine, France.
Decouverte de niveaux a charophytes dans le Cretace inf. du Dj. Meimel (Constantine, Algerie); etude de la serie stratigraphique
Authors: Baer Christian , Magne Jean  
Published: June 2020

Abstract
In a detailed study of the Cretaceous series of the Djebel Meimel massif, Constantine, Algeria, charophytes were found in strata attributable to the basal Aptian. Beds containing Atopochara trivolvis, a species not previously noted in north Africa, seem to constitute a good horizon marker.
Vraconien et Cenomanien neritiques entre Var et Siagne (Alpes-Maritimes)
Authors: Parent Henri 
Published: June 2020

Abstract
Describes Vraconian and Cenomanian (Cretaceous) beds, characterized by a neritic facies, which outcrop in the Var-Siagne region, France. The same shallow-water fauna, particularly small forms of the pelecypod Exogyra, is represented in this facies, which has previously been encountered in Cenomanian deposits of other localities in Alpes-Maritimes.
Sur la structure d'une partie de l'Atlas tellien septentrional
Authors: Caire Andre , Chauve Pierre , Glangeaud Louis , Mattauer Maurice 
Published: June 2020

Abstract
Discusses the extent of occurrence of horizontally displaced sedimentary masses in the northern Atlas range in the Tell region, Algeria, and ascribes the mechanism of emplacement of these allochthonous lenses to successive flows on flexure fronts.
Nouvelles especes de charophytes dans les niveaux de la limite jurassico-cretacee du Jura, des Alpes-Maritimes et de la Provence
Authors: Donze Pierre 
Published: June 2020

Abstract
Describes three new species of charophytes from Jurassic-Cretaceous boundary beds in the Jura, Alpes-Maritimes, and Provence regions, France--Clavator thorali, C. fieri, and Aclistochara maxima.
Un probleme stratigraphique de la Patagonie; la serie porphyrique
Authors: Cecioni Giovanni 
Published: June 2020

Abstract
The Bahia Laura, Ibanez, Seno Rodriguez, and Flamenco formations of Patagonia form a single stratigraphic unit. The basal beds of the Seno Rodriguez and Flamenco formations may be derived from rhyo-lites, but the upper, and greater, part consists of consolidated glacial and fluvioglacial deposits, considered upper Jurassic in age. The name "porphyry series" is thus inapt and should be dropped.
Etude des phenomenes metasomatiques dans les amphibolites des monts du Lyonnais
Authors: Peterlongo Jean 
Published: June 2020

Abstract
A detailed study (with chemical analyses) of migmatitic amphibolites in the Lyonnais mountains and comparison with similar rocks from the Central Massif, France. Notwithstanding their different aspect, the nature of chemical exchanges during metasomatic processes and the mechanism of their formation are analogous to those of gneiss.
Quelques observations petrographiques sur un recif du Sequanien d'Angoulins (Charente-Maritime)
Authors: Lafuste Jean 
Published: June 2020

Abstract
A petrographic study of a Sequanian (Jurassic) coral reef deposit exposed in the cliff at Angoulins near La Rochelle, France. Formation of the reef probably took place on a shallow platform, and was accompanied by deposition of abundant terrigenous material under conditions of extremely variable currents.
Quelques remarques sur les littoraux actuels pour la comprehension des littoraux fossiles
Authors: Bourcart Jacques 
Published: June 2020

Abstract
Observations of present shore features are an aid in interpretation of Quaternary beaches. In the cliffs of the estuaries on the coast of Brittany, France, a sharp break in slope corresponds to the boundary between dry and wet zones, variable according to exposure. Criteria for distinguishing beaches of continental origin from those of marine origin are discussed.