bluuebunny/crossref_metadata_2025 huggingface dataset:
Geologie littorale et sous-marine dans la region de Marseille; relations avec les structures de la Basse-Provence
Authors: Blanc Jean , Froget Claude , Guieu Gerard
Published: June 2020

Folding, subsidence, tilt blocks, submarine karst topography, emergent Quaternary deposits, tectonic-geomorphic-geologic zonation, Pliocene-Quaternary, France
Evolution tectonique des regions du Bas-Verdon
Authors: Morabito Jean
Published: June 2020

Fault folds, secondary fault complex, Tertiary tectonism, Triassic-Pliocene tectonic phases, France
Milovanovicia, un nouveau genre de rudistes de la famille des radiolitides
Authors: Polsak Ante
Published: June 2020

Systematic descriptions, two new species, Turonian (Cretaceous), Yugoslavia
Deux especes nouvelles de Chondrodonta et Neithea (bivalves) du Senonien du Taurus lycien (Turquie)
Authors: Freneix Suzanne , Lefevre Roger
Published: June 2020

Systematic descriptions, revision of Chondrodonta, new subgenera
Contribution a la connaissance du genre Orioporella Munier-Chalmas
Authors: Segonzac Genevieve
Published: June 2020

Acetabularian algae, systematic description, O. villattae n. sp., lower Eocene, France
Composition isotopique du soufre et probleme de la genese des galenes; contribution au debat syngenese-epigenese
Authors: Allegre Claude J. , Duchaylard Georges , Javoy Marc , Sarazin Gerard
Published: June 2020

Galena, sedimentary pyrite, S 32 /S 34 ratios, isotopic geochemistry of sulfur, experimental methods, isotopic fractioning, metallogeny
Contribution a l'etude geologique de la region de la Brianza orientale (prov. de Come, Italie)
Authors: Guillot Pierre Louis
Published: June 2020

Liassic to Eocene stratigraphy, lithofacies, tectonics, paleogeography
Le Lias moyen des environs de Huescar (province de Grenade, Espagne)
Authors: Dubar Gonzague , Foucault Alain , Mouterde Rene
Published: June 2020

Biostratigraphy, ammonite zones, correlations, measured section
Sur la structure du massif du Chenoua (Algerie)
Authors: Lepvrier Claude
Published: June 2020

Two phases of tangential tectonism, lithofacies changes, Tertiary
Contribution a l'etude du Cambro-Ordovicien des chaines d'Ougarta
Authors: Gomes Silva Michel , Pacaud Michel , Wiel Francis
Published: June 2020

The Ougarta chain near Beni Abbes in western Algeria is a junction zone of unusual importance in regional stratigraphic correlations. The Ougarta sandstone series, exposed in an anticline from near Zerhamra southeast to Kerzaz, has several discordances within it. Its division into the following seven formations is proposed. The Sebkha el Melah arkosic sandstone, unconformable upon the rhyolite-metamorphic sole, and the overlying An en Nechea quartzite probably are lower Ordovician instead of Cambrian. The five remaining formations, the Foum Tineslem shale, the Kheneg el Aatene quartzitic sandstone, the Foum es Zeidiya shale, sandstone, and lenticular sandy limestone, the Bou M'Haoud ferruginous sandstone and shale, and the Djebel Serraf conglomerate, shale, and sandstone contain lower Ordovician faunas.
Etude petrographique du siderolithique du Lot (gisement de Saint-Martin-le-Redon) (confins du Perigord, de l'Agenais, du Quercy)
Authors: Deschamps Marc
Published: June 2020

A sink hole in Senonian limestone (southern Perigord, France) yielded a siderolithic deposit of Ludian age (upper Eocene) which consists of a series of poorly stratified clay, sandstone and multicolored sand with interbedded mineralized beds. Results of the petrographic analysis of thin sections made from these rocks show that percolating water attacked the ferromagnesian minerals, potassium silicates and sodic-calcic minerals, modifying their crystallographic texture, contributing to the formation of secondary minerals, and staining the rocks toward the base of the deposit. The consolidation of these minerals by polymorphic silica, itself attacked by the waters, suggests the possible existence of an essentially dry, tropical climate. However, the proportion of amphiboles in the arkoses is noticeably greater than in the sands, sandstones, and kaolinite deposits, thus ascribing a warmer, more humid aspect to the upper Eocene. Oxides are common at the base of the facies, which rests directly on Cretaceous limestones.
Style en plis couches et laminages dans le Paleozoique du Minervois (Montagne-Noire, Aude)
Authors: Boyer Francois
Published: June 2020

Reexamination of the three major structural zones in the Paleozoic units southwest of Montagne-Noire has resulted in a new interpretation of the tectonic aspect of their formation. The units strike WSW-ENE and disappear to the south where they are overlain by Tertiary deposits. They are limited to the north by an epimetamorphic series of undetermined age. The central unit is formed in lower Cambrian-Visean strata and comprises the Caunes syncline and Montbonous anticline. The northern unit, including the Cambrian Fournes and Lastours synclines and the Gotlandian-Devonian Citou and Ilhes synclines, is confined to a narrow band where the Caradocian is transgressive and unconformable on the Cambrian. The southern zone is restricted to the lower Ordovician Vexillum-bearing flysch. Orientation of numerous small recumbent folds on the flanks of the major folds indicates that the larger units are recumbent, overturned to the south. The middle unit is considered allochthonous since it is limited to the north and south by major tectonic disturbances and rests on a variable substratum. The existence of recumbent folding and allochthonous structures in an autochthonous area suggests that the tangential pressure exerted on the area south of Montagne-Noire originated from the north.
Tectonique de la region de Bobbio (Apennin septentrional, Italie)
Authors: Labesse Bernard
Published: June 2020

On the basis of field work and the results of recent stratigraphic studies, new interpretations are proposed regarding the orogenic phases which produced the overthrust structures in the Bobbio area, a region where the deeper units, exposed in a fenster, are younger than the surrounding higher units. In the Trebbia valley, proceeding north from Marsaglia, clays of the upper member of the Oligocene Bobbio unit are underlain by almost vertical beds of schistose pelitic clays, and then by sandstones, dipping 80-85 degrees . These two units belong to the macigno, the lower member of the Bobbio unit. It is concluded that the pelitic clay represents the lower of the two beds as there is no indication of their lateral equivalence or of a fault with horizontal separation in the order of 1000 m., a magnitude necessary if the clay were superimposed on the sandstone. The basal deposits of the upper Bobbio member are olistostromal, followed by the true clays. Existence of olistostromal elements suggests major intra-Oligocene movements, responsible for the structure of the macigno member. Limestones of the Penice mountain unit were overthrust on the Bobbio when the olistostromal elements were being deposited. The Arpiselle mountain unit is overthrust on the Penice and is in turn overridden by the Cretaceous Helminthoides flysch.
Contribution a l'etude du Quaternaire de l'Artois, region de Bethune
Authors: Bertouille Horace
Published: June 2020

The Quaternary deposits in the Bethune-Bruay-Allouagne-Chocques area are exposed on two hills composed of marine and continental (Ostricourt sands) facies of Landenian sands. The Ostricourt sands are overlain by a podzolic paleosol which underlies sandy loams and clays previously considered as Sparnacian. However, the presence of such periglacial phenomena as ice wedges and mammilliform sandstones in the podzols, and pergelisol pebbles in the loams and clays suggests that these deposits may actually be very early Quaternary. Overlying these deposits is a series of three soilflows alternating with paleosols, and separated from the Mindel-Riss interglacial by a hiatus. Eolian sands compose the Mindel deposits which are overlain by numerous soilflows of the Riss. The Wuerm is represented by three loess deposits sometimes intercalated with flows of leached rubble.
Les loess de Goderville (Seine-Maritime) et la stratigraphie du Quaternaire recent
Authors: Bordes Francois
Published: June 2020

The interpretation by Heinzelin (1961) of the Mousterian and Perigordian artifacts in the Goderville loess deposits (northern France) is not entirely acceptable. Five major points of difference are discussed. It is probable that two Wuermian stades existed before the upper Paleolithic began (35-40,000 yrs B.P.) rather than one as concluded by Heinzelin.
Les terrasses du confluent Loir-Sarthe et leurs industries
Authors: Gruet Michel
Published: June 2020

Five terrace levels can be recognized along the left bank of the Loir river between Angers and Villeveque (France). With the exception of a narrow band of Precambrian schists in the cliffs around Ecouflant, the terraces overlie a substratum of Cretaceous units. The highest terrace is predominantly a coarse sediment consisting of chert, sandstone pebbles, quartz and sand. The next lower terrace is distinguished by its coarse alluvium in which the sand grains show characteristics of eolian deposition. The oldest human remains in the area have been found in this terrace. The upper three-fourths of the third terrace is a light yellow, coarse alluvium washed down by the Loir river; the lower fourth consists of fine-grained, red sand with gravels containing Paleozoic fossils and granite boulders from the Sarthe. A human habitat is described from below this terrace. The next lower terrace consists of coarse Wuermian alluvium--elements as large as 17 cm. The lowest terrace is composed of fine Flandrian sands containing a molluscan fauna characterized by nanism of all the individuals and abundance of Valvata species. All the deposits except the Flandrian are characteristic cold climate sediments, probably deposited by the rapid fusion of snow accumulated on frozen ground incapable of absorption. A cross section illustrates the relative positions of the terraces as well as their characteristic features and the human industries represented in each.
Presence et extension d'un niveau marin littoral interglaciaire sur la cote du Medoc
Authors: Elha Henri , Prenant Andre
Published: June 2020

In the five sections studied along the Medoc coast (southwest France) the succession of sediments below the present high tide mark was constant: green plastic thick at the base of the cliffs Perigord below into micaceous sandy clay and then micaceous sand. Above the clays the sequence varied from section to section. Granulometric analysis shows that the top of the clays marks the limit between two radically different regimes: conditions of decreasing preceding depth and increasing preceding wave and current action below concretionary clay, and conditions corresponding to the rapid reduction in the constancy of the currents above the clay. Macro- and microfaunas collected from the sands are characteristic of extreme marine littoral conditions. The marked dip of the clays toward the sea, in contrast with the nearly horizontal nature of the overlying deposits, can be attributed to the withdrawal of the sea after deposition. The parallelism between the level studied and the present littoral zone, the pollen analyses, the absence of any marine erosion prior to the existing erosion, and the eolian character of the sand grains in all the sediments indicates that deposition occurred in a recent interglacial period. Cross sections, granulometric curves, and pollen diagrams are included.
Description d'une forme d'accumulation de gypse par voie eolienne dans le sud tunisien
Authors: Trichet Jean
Published: June 2020

Petrographic and chemical analysis of the gypsiferous dune sand formations in the northern part of the Djerid salt flat (Tunisia) gives an indication of the origin of the deposits and provides further proof of the intensity of the eolian forces in subdesert climates. Results of the study show that five elements were transported by the wind: lenticular and friable gypsum, quartz grains, sodium chloride, and aggregates of these. The lenticular gypsum was formed in a supersaturated salt solution (Djerid salt flat). The friable gypsum originated from the efflorescences at the surface of the flat, was transported by the wind, and then immobilized by increasing humidity and vegetation. The granulometry of the quartz grains and the rounded, worn character of the aggregates also indicate eolian transportation.
Donnees stratigraphiques complementaires sur le Jurassique moyen des synclinaux d'El Mers et de Skoura (Moyen-Atlas, Maroc)
Authors: Dresnay Renaud du
Published: June 2020

Subsidence of the El Mers and the Skoura synclines was suggested and data from echinoderms, pelecypods, brachiopods, and 25 ammonites support the idea and indicate that subsidence was slow and continual permitting the deposition of 3,000 meters of beds. The conditions of sedimentation of these deltaic deposits are similar to those of the dinosaur beds of Tendaguru in Tanganyika. The faunas are analogous to those of Arabia and Madagascar and are significant in studying the succession of faunas on the circumferences of the African-Malagasy continent.
L'Oligocene inferieur au sud de la butte Pincon (Seine). Presence du calcaire de Sannois
Authors: Cavelier Claude
Published: June 2020

The lower Oligocene Pincon strata lying between the Fontainebleau sands and the Pantin white marls--in comparison to the equivalent beds at Cormeilles, Sannois, and Orgement-- are analogous, especially in the development of the Sannois limestone. In general the marine beds decrease in thickness from west to east, generally at the expense of the basal beds. Continental strata thicken in the same direction.
Essai de geomorphologie du bassin superieur du Doulou (Aubrac sud-oriental): le glacier du Doulou
Authors: Rousset Claude
Published: June 2020

The upper Doulou basin (southern France) is underlain by garnet and staurolite mica schists covered in places by Rhaetian arkoses. Miocene lava flows are found on the higher elevations. Tertiary volcanism, Quaternary glaciation, and Recent and sub-Recent erosion have been the determining elements in the morphology of the area. Evidence of a glacial valley, drained by the Doulou river, has been found on the south flank of the Aubrac mountains. The valley was carved during the Rissian and was again glaciated in the Wuermian. The result of glacial and postglacial action has been the formation of the present basin of the Doulou which resembles a cluster of rivers diverging toward the southeast.
Essai de synthese stratigraphique du Paleozoique inferieur de la bordure septentrionale de la syneclise de Taoudeni (Sahara occidental)
Authors: Delpy Jacques , Trompette Roland , Villemur Jean R.
Published: June 2020

A tillite bed divides the lower Paleozoic of the northern border of the Taoudeni syncline into two unconformable series--the lower, or Infracambrian series and the upper, or Cambrian series. Recent studies involving the Infracambrian resulted in the recognition of three subdivisions. The lower, Char group, rests unconformably on the Precambrian basement. The middle, Atar group, is transgressive on the Char and is characterized by the development of carbonate intervals which contain stromatolites. The upper, Assabet el Hassian group, is transgressive on the Atar and contains fine sandstones, pelites, and argillites. These groups are recognizable from Atar (Mauritania) to the Algerian frontier.
Le groupe du Tasiast, nouvelle unite lithostratigraphique du socle antecambrien de la Mauritanie occidentale
Authors: Bonnici Jean Paul , Giraudon Robert
Published: June 2020

The Tasiast group in the extreme northwestern part of Mauritania is an igneous-sedimentary complex, 2000 m thick and regionally metamorphosed. The lithology, from top to bottom, consists of a gneiss with biotite and muscovite, upper amphibolites, ferruginous quartzites and itabirites, lower amphibolites, and migmatite granites. The upper absolute age limit of the group is 2600 m.y., obtained from lepidolite in a pegmatite. An age of 1850 m.y. was given by the migmatite granites. This group represents the crystalline schists previously divided into the Amsaga series and the Akjoujt series. The Tasiast group also crops out in Tijirit and Inchiri and may extend farther toward the east and north.
Les limites de la transgression miocene en Vautubiere (Jouques). Influences tectoniques
Authors: Rousset Claude
Published: June 2020

Miocene sedimentation in the northeast part of the Jouques basin was limited by the Vautubiere mountain. The Miocene deposits consist of transgressive marine sandstone and molasse overlain by lacustrine limestone and sandy limestone characterized by Helix christoli. This in turn is overlain by puddingstone and alluvium with cobbles of limestone and quartzite. The abundance of Helix suggests burial of complete populations from time to time under conditions similar to the present, but with a warmer climate.
Paleogeographie devonienne et mineralisations ferrugineuses de Dielette (Manche) et plombo-zinciferes de Surtainville (Manche)
Authors: Pavillon Marie Jose
Published: June 2020

Marine clastic formations of Cambrian, Ordovician, and Silurian age in the Flamanville area of northwestern France were folded during the Caledonian orogeny into a series of broad anticlinal and synclinal folds with the tops of the anticlines emergent and undergoing erosion by early Devonian time. The earlier Devonian formations were formed by deposition of the detritus in the adjacent synclinal troughs. Later deposits formed after renewed subsidence show facies differences between the marine shallow-water areas of the anticlinal crests, the deeper water of the flanks, and the deepest water of the synclinal troughs. Ferruginous oolite beds occur in marine sandy shales in the northern part of the area, and veinlets of lead-zinc mineralization occur in the southern part. The minerals probably were deposited in the original sediments, and later metamorphosed by intrusion of the Flamanville granite whose contact-metamorphic effects are prominent. The iron mineralization probably was deposited in marine shallows, and the lead-zinc minerals in adjoining belts.
La serie aquitanienne de Millesimo (Italie, province de Savone)
Authors: Lorenz Claude
Published: June 2020

The Millesimo series of conglomerate and sandstone overlain by gray marl is transgressive upon the margin of the Ligurian Alps in the southern part of the Po basin. A fossiliferous zone in the marl contains large lepidocyclines and heterostegines. The fauna and the microfauna (notably miogypsinids and lepidocyclines) are lower and middle Aquitanian in age.
Un cephalopode remarquable de l'Hauterivien basal de la Drome; Himantoceras nov. gen
Authors: Thieuloy Jean Pierre
Published: June 2020

A new genus, Himantoceras n. gen., and three new species, H. trinodosum n. sp., H. acuticostatum n. sp., and H. collignoni n. sp., are described from southeastern France. The stratigraphic horizon from which these specimens were obtained is at the base of a thin bed of marl transitional between the Valanginian and the Hauterivian (lower Cretaceous).
Sur quelques Castorides du bassin d'Aquitaine
Authors: Bergounioux Frederic Marie , Crouzel Fernand
Published: June 2020

Fossil Castoridae, except for isolated fossil teeth, are little known in the Aquitaine basin of southwestern France. Recent discoveries at Sansan suggest a fairly large population, and a possible evolutionary relationship between Steneofiber viciacensis, S. depereti, and S. jaegeri involving a progressive simplification of the crown of molar teeth.
Stratigraphie du Paleogene des Karpates
Authors: Andrusov Dimitrij
Published: June 2020

The Paleogene stratigraphy of the Carpathian mountains is particularly complex because deposition of flysch in the region began in the lower Cretaceous, and during the Paleogene was predominant. Four principal facies of Paleogene formations are present. The foreland non-flysch facies, not folded, transgressive, and incomplete in sequence, lies on the north margin. In turn southward are the zone of Paleogene flysch, strongly folded and closely related to that of the Cretaceous; the Paleogene of the central western part of the region, transgressive upon a folded substratum (particularly the middle Cretaceous), but with flysch facies predominant; and the facies in Hungary and southern Slovakia that is neither folded nor flysch.
Le Cretace superieur et le Paleogene dans la dorsale calcaire aux abords meridionaux de Tetouan (Rif septentrional, Maroc)
Authors: Griffon Jean Claude , Magne J. , Sigal Jacques
Published: June 2020

The limestone dorsal of the northern part of the Rif mountains near Tetuan, Morocco, exposes Permian clastics, Triassic dolomite, Jurassic and lower Cretaceous limestone, upper Cretaceous to Eocene marl, transgressive upper Eocene conglomerate, and Oligocene flysch. The microfauna of the upper Cretaceous and the Paleogene formations are particularly useful in correlations. Major tectonic movements occurred in the Miocene.
La foliation des schistes cristallins: etude de sa genese a l'aide de quelques exemples
Authors: Grolier Jacques , Vialon Pierre
Published: June 2020

The origin and significance of foliation in schists, and the relationship to schistosity and bedding are discussed in detail. Schists of the Central Massif of southwestern France and the Dora-Mara massif of the Italian piedmont are the basis of discussion. Isoclinal folding of strata is an important factor involved.
Constitution de quelques roches volcaniques permiennes de la Sierra del Cadi (Pyrenees catalanes)
Authors: Morre Nicole , Thiebaut Jean
Published: June 2020

The Permian volcanic rocks of the Sierra del Cadi in the Catalonian Pyrenees of northeastern Spain are intermediate in chemical composition. Some of them are partly devitrified hyalodacite and hyaloandesite similar to the volcanic rocks of the Midi d'Ossau peak nearby. Albitophyre occurs locally, with a hyaloalbitophyre facies in one locality. The eruptive rocks of the Sierra del Cadi exhibit spilitization resulting from pneumatolytic and hydrothermal agents.
Sur la nature des 'dykes' de quartz jalonnant le front de certains grands massifs de roches ultrabasiques en Nouvelle-Caledonie et sur ses consequences
Authors: Avias Jacques
Published: June 2020

Numerous dikes or 'quartz fronts' characterizing the borders of ultrabasic massifs of the 'recouvrant' type in New Caledonia are serpentinite breccias cemented by quartz. They are localized at serpentinite contacts.
La zone du Plan d'Aups dans sa region type, la Sainte-Baume (Var)
Authors: Fabre-Taxy Suzanne , Philip Jean
Published: June 2020

The Plan d'Aups ecozone in the Sainte-Baume massif of southern France is known to be Santonian (upper Cretaceous) from beds of rudistids intercalated in the formation. These beds grade laterally into Santonian sandstones.
Analyse palynologique de quelques echantillons de marne a lignite (Oligocene superieur) du bassin de Bagnasco (Italie, prov. de Cuneo)
Authors: Gruas-Cavagnetto Carla
Published: June 2020

The Oligocene of the Bagnasco basin in the Piedmont of northwestern Italy is poor in microflora in general, but pollen spores from a bed of lignitic marl indicate the presence of a swampy forest of Taxodiaceae and Cupressaceae surrounded by mountainous terrain with a predominantly pine forest.
Caracteres petrographiques de l'ophite de Vebre (Ariege)
Authors: Riotte Ch , Thiebaut Jean
Published: June 2020

Petrographic analysis of the ophite outcrop on the right bank of the Ariege river, below Vebre, France, shows that the rock is rich in epidote and exhibits pegmatoid differentiation. Three rock types are distinguished--common ophite with variable amounts of epidote; ophite with phlogopite; and pegmatoid rocks with orthoclase. The results of four chemical analyses indicate that the Vebre ophites were affected by pneumatolysis during crystallization from a saturated basaltic magma. The pneumatolysis caused the crystallization of hornblende and, in a later phase of potassium enrichment, the superimposition of orthoclase in the pegmatoid plagioclases and the phlogopite in the hornblende crystals of the ophite.
Observations sur les terrasses du moyen-Euphrate
Authors: Heinzelin Jean de
Published: June 2020

Four Quaternary formations are exposed upstream from the site of the future dam at Tabqa on the Euphrates (Syria). The Dibsi formation presents extensive pedogenesis at its summit which suggests that it is the oldest of the four formations. The second level is represented by fluvial terraces, the Shajara formation. The Mureibat formation consists of fluvial terraces below the Shajara formation. The Mureibat is considerably older than the pre-ceramic Neolithic and is attributed to the end of the upper Pleistocene. The fourth formation is the present alluvial plain which has evolved since the Neolithic. No fossiliferous beds were encountered. Modifications of the hydrographic basin may be the result of Recent tectonic disturbances in the Middle East.
Sur la structure en coussins des volcanites basiques de la region de Cumbres-Mayores (Huelva, Espagne)
Authors: Bard Jean Pierre
Published: June 2020

Petrographic and structural analyses of the pillow lavas in the Cumbres-Mayores spilitic complex show that they belong to two different basic volcanic rock types representing different conditions of emplacement. The first type exhibits decreasing crystallinity toward the center of the mass, radial disposition of amygdules, a clastic envelope, and a clay-sand cement between the pillows. This suggests that this type of pillow structure was formed in an unconsolidated mud. The second type has fluid structures parallel to the contours of the pillows, ovoid lithophysae, clastic aureoles and very little or no cement. These pillows were probably formed in open water, rolled on the sea floor, and massed in piles.
Introduction a la seance sur la geologie du bassin de Paris
Authors: Pomerol Charles
Published: June 2020

This introduction to a series of papers on the geology of the Paris basin includes a review and description of Mesozoic and Tertiary type sections as well as correlations with established units in other countries.
Etude paleontologique et sedimentologique du Bartonien inferieur (Auversien) dans la localite-type du Guepelle (Seine-et-Oise)
Authors: Pomerol Charles , Damotte Renee , Ginsburg L. , Montenat Christian , Lorenz Jacqueline , Toutin Nadege
Published: June 2020

Recent detailed paleontologic and sedimentologic studies of the type locality of the Auversian at Guepelle, France, showed a complete succession of beds from the upper Lutetian to the Marinesian, characterized by Avicula defrancei in sandstone blocks ascribed to the Mortefontaine formation. A sequence of five facies is recognized which is mainly composed of sandstones with a rich and well-preserved fauna, including 200 molluscan species and some ten mammalian species. A detailed list of the fauna collected is given together with a lithologic description of the Guepelle locality.
Le gisement eocene du cap d'Ailly (pres de Dieppe, Seine-Maritime)
Authors: Bignot Gerard
Published: June 2020

A study of seven sections along the Ailly cape, France, permits recognition of five Eocene formations. The upper Thanetian is represented by marine sands with chert and sandstones; the Ailly lacustrine limestones are terminal Thanetian. A third formation, here designated the Caude-Cote annelid sands and clays, overlies the Thanetian marine sands and is thought to be of terminal Thanetian age. The Sparnacian is represented by lignitic clays below and sands and shales rich in ostracods and mollusks above. The Varengeville formation, which is the lowermost Cuisian formation, is represented by four lithofacies whose sediments and fauna suggest emerging conditions. Correlations with the Paris and Belgium basins indicate that the Ailly gulf was isolated from other regions, and was subjected to an erosional period during the Cuisian.
Connaissances nouvelles sur la structure de la Beauce
Authors: Desprez Noel , Megnien Claude
Published: June 2020

This preliminary report--part of a detailed hydrologic study--based on isopach contours plotted from nearly 900 cores gives an outline of the subsurface Tertiary stratigraphy and structures of Beauce (France). The isopachs make it possible to recognize the limits of the Burdigalian, upper Aquitanian limestones, the lower Aquitanian molasse, the lower Stampian Fontainebleau sands, the upper Stampian limestones, and the Sannoisian and Eocene lower lacustrine limestones. Structural features deduced show a great variation in the thickness of the lacustrine series.
Inclusions alluvionnaires dans les eboulis de coteaux de la region parisienne
Authors: Soyer Robert
Published: June 2020

Intercalations of alluvial sand and gravel have been discovered in hillslope deposits of the Paris area. The known examples of this type of occurrence do not yet clarify the relationship between the two kinds of deposits. Five measured sections are briefly described.
Associations minerales, subfacies et types de metamorphisme dans les micaschistes et les gneiss pelitiques du massif du Canigou (Pyrenees-Orientales)
Authors: Guitard G.
Published: June 2020

The progressive metamorphism of Canaveilles series (Cambrian) pelitic sediments, in the Canigou massif of the eastern Pyrenees, was studied by the systematic analysis of the mineral associations and application of the phase rule. Eleven subfacies--muscovite-chlorite to sillimanite-microcline--are described and grouped into suites. The sillimanite-microcline subfacies occurs locally at the contact with anatectic granites, frequently masked by the development of potassium metasomatites resulting from the percolation of postmagmatic solutions through the country rock. Three types of metamorphism are recognized. The types are indicative of increasing pressure from west to east at the time of the Hercynian metamorphism.
Nouvelle contribution a l'etude des algues calcaires du Carbonifere saharien
Authors: Chanton Nicole
Published: June 2020

Five species of calcareous algae (Dasycladaceae), two of which are new--Anthracoporella menchikoffi, Ungdarella maslovi--are described from the Colomb-Bechar and Polignac basins. The ten genera now known from the Sahara basins are important primarily as ecologic and paleogeographic indicators; of the ten, only Koninckopora is a good index fossil.
Contribution a l'etude stratigraphique du Lias des Dolomites italiennes (Italie du nord)
Authors: Cros Pierre
Published: June 2020

The gray limestone facies of the Italian Dolomites is confined to the lower Liassic and rests unconformably on the last Triasina-bearing beds of pre-Liassic age. Middle Liassic crinoidal limestones overlie the gray limestone and are overlain by upper Liassic chemical sediments. The only evidence for upper Liassic age strata is the presence of the ammonites Harpoceras discodes and Hammatoceras insigne. For the most part, the upper Liassic was a period of nondeposition.
Les gisements de fluorine de la Provence cristalline (Maures, Tanneron, Esterel)
Authors: Solety Pierre
Published: June 2020

The fluorite deposits of the Maures-Tanneron-Esterel region of southeastern France generally occur as groups of parallel east-west-trending veins. Most of them are closely associated with east-west-trending structural lineaments of Permian age, but are also related to north-south-trending mylonized zones in the basement rocks of the region. Mineralization took place in two stages, an early barite-fluorite stage and a later quartz stage with or without sulfides. These deposits probably originated in the late Permian during the final phases of acidic magmatism.
Le stratotype de l'Aquitanien (Mayer-Eymar, 1857-1858)
Authors: Szoets Endre
Published: June 2020

The stratigraphic position of the type Aquitanian (Gironde, France), variously considered as Oligocene or Miocene, has been established as basal Miocene. Although Mayer-Eymar first employed the term Aquitanian in 1853 without defining a type section, he defined the type section in 1857 (1858) as the beds exposed between the Bernachon and Eglise mills on the Saint-Jean d'Etampes brook. These beds, which are definitely lower Miocene, must be used as the standard for age assignments elsewhere in the world.
Complement a l'etude de la faune des rongeurs de Sansan; les glirides
Authors: Baudelot Sabine
Published: June 2020

Representatives of the Gliridae, a little known family of Miocene rodents, have been found at Sansan in the Aquitaine basin of southwestern France. A new genus and four species are described. They are Myoglis n. gen., M. larteti n. sp., Muscardinus sansaniensis, Glirulus miocaenicus n. sp., and Dryomys hamadryas. These fossils may be important indicators in the biochronology of the Miocene.
Apercu sur la stratigraphie de l'Eubee moyenne (Grece)
Authors: Guernet Claude
Published: June 2020

The stratigraphy of the island of Euboea (Greece), an area unusually well suited to investigation of the Pelagonian zone of the Hellenides, is less well known than the structure. The formations of central Euboea are carbonaceous shales of Carboniferous age, Permian black limestones overlain by diabase and spilite, Triassic and Jurassic limestones and ophiolites, upper Cretaceous basal conglomerate, limestone, and flysch, Miocene marly limestone (overlain by lagoonal and lacustrine deposits in the Kimy and Gides basins), and Pliocene conglomeratic deposits.
Nouveau gisement de pegmatitoides a la Sagnette (Cantal)
Authors: Vatin-Perignon Nicole , Goer de Herve Alain de
Published: June 2020

The pegmatoids of Sagnette (Cantal, France) represent an ultimate stage in magmatic differentiation. They occur in the uppermost zone of a basanite sill as veins and stringers of leucocratic rocks, characterized by a gabbroic facies. Alkalinity and acidity values are higher than those of adjacent basanites. The rocks are intermediate between theralites and essexites.
Les granites a muscovite du mont Pilat (Massif central)
Authors: Ravier Jean , Chenevoy Maurice
Published: June 2020

Muscovite granites of the Pilat massif (French Central Massif) can be divided into two large groups. Those belonging to the first group appear in the so-called metamorphic series of the Pilat massif and are associated with granulites of rhyolitic origin from which they were directly derived by anatexis. Those of the second group are doubtless of similar origin, although this is more difficult to establish. All these granites have a constant chemical composition. Their magmatic paragenesis includes, in addition to quartz, potassic feldspar and albite, some biotite, a little muscovite, and occasionally andalusite. The data seem to indicate crystallization under conditions of low pressure and temperatures less than 700 degrees C. Subsequently, secondary muscovitization developed at the expense of andalusite. The muscovite granites of the Pilat massif do not present a mineralization sequence. Their mode of formation was quite different from that of the late hololeucocratic granites resulting from a differentiation of granitoid assemblages.
Sur la limite siluro-devonienne dans le Cotentin
Authors: Robardet Michel
Published: June 2020

On the basis of newly discovered graptolite beds in the Cotentin peninsula (France), certain outcrops can be precisely dated as Silurian. The shales of Hautmesnil represent the upper part of the lower Valentian (lower Silurian). Nodular shales of Saint-Sauveur-le-Vicomte have yielded Monograptus ultimus and are assigned to the Ludlovian (upper Silurian). The entire Silurian-Devonian series has an extent which is of greater importance than was previously thought. No evidence of the Gedinnian (Devonian) was observed, however.
Les trachytes du Mont-Dore et du Cantal septentrional et leurs enclaves
Authors: Brousse Robert , Varet Jacques
Published: June 2020

The trachytes of Mont-Dore and the environs of Menet, in the Cantal [Central Massif of France] are described and analyzed, along with their homogeneous inclusions and basement xenoliths. Two petrographic groups are identified within the trachytes; one is undersaturated and is allied to the phonolites, while the other is of the pantellerite type. The discussion of these latter rocks shows that they were derived from a trachytic magma and are sharply distinct from rhyolites.
Caracteres petrographiques des tufs viseens du Puix-Gy (Territoire de Belfort)
Authors: Fourquin Claude
Published: June 2020

A very important formation of tuffs is reported within the volcanic-detrital Visean (Carboniferous) forming the first southern foothills of the Ballon d'Alsace massif (southern Vosges [France]). Modal analyses indicate notable variations in the composition of these tuffs, some of them being systematic. The variation of the porphyricity index as a function of sample distribution shows that their center of extrusion may be beneath the Permian of the Giromagny basin. Chemical and mineral composition place these rhyodacitic tuffs at the acidic end of differentiation of the supersilicic series to which the volcanism of the Culm of the southern Vosges is referred.
Etude petrographique des laves carboniferes de la region de Figeac (Lot)
Authors: Morre Nicole
Published: June 2020

Carboniferous volcanic rocks of the Figeac-Planioles region (Lot [France]) belong to a number of distinct petrographic types: trachytes, hyalotrachybasalts, and hyalorhyobasalts with orthopyroxene and glasses of varied compositions. The common characteristic of all these rocks is a great enrichment in potassium.
Sur l'age des principaux traits structuraux du Diois et des Baronnies
Authors: Flandrin Jacques
Published: June 2020

The structure of the Diois and Baronnies [ranges] results from pre-Santonian, pre-Eocene, pre-Oligocene, pre-Miocene, and post-Miocene deformation. All the folds and overthrusts of east-west orientation, responsible for the main orogenic features of these two regions, result, whatever their age, from orogenic activity of provencal origin while the large north-south and nearly north-south faults that subdivide these folds arise from alpine thrusting. Structurally, the Diois and Baronnies ranges are strictly provencal ranges that are only related to the Subalpine ranges by their final north-south deformation.
Sur la presence d'une formation conglomeratique a faune d'age tithonique superieur dans la region de Marignac-en-Diois (NE de Die, Drome)
Authors: Le Hegarat G.
Published: June 2020

The discovery of this new deposit [Marignac-en-Diois, Drome, French Prealps] allows establishment for the first time of accurate correlations at the level of the Tithonian-Berriasian [Jurassic-Cretaceous] transition between a locality in Ardeche and a Vocontian deposit with the aid of ammonites collected strictly in place.
Le Barremien et ses limites dans le centre de la montagne de Lure (Basses-Alpes)
Authors: Busnardo Robert , Foury G.
Published: June 2020

Some stratigraphic and detailed paleontologic observations, made concerning the famous Barremian deposits of Combe-Petite and Morteiron [Lure mountain, Basses-Alpes, France], lead to the following conclusions: the deposits mentioned represent specialized biotopes and are very localized; the Barremian in the middle of Lure mountain is of fairly small thickness, variable and of very diverse facies, with locally some interstratified glauconitic breccias, hard-ground, etc.; finally the main limestone mass of the summit of Lure belongs in large part to the Hauterivian [lower Cretaceous].
Note preliminaire sur la paleogeographie du Tithonique des chaines subalpines
Authors: Remane Juergen
Published: June 2020

The stratigraphy and paleogeography of the Tithonian (upper Jurassic) dolomitic limestones and redeposited breccias of the French Subalpine ranges are outlined. The dolomitic limestones are common throughout the Tithonian, being most highly developed in the northwestern part of the Chartreuse massif. They are of diagenetic origin. The redeposited breccias, most common in the lower Tithonian, represent deep-water sediments and are thickest at the center of the Vocontian trough. The origin of the reworked components is not known.
Les facies du Jurassique terminal dans les chaines subalpines meridionales au sud et a l'est de la Durance; leur repartition geographique
Authors: Tempier Claude
Published: June 2020

The study of the different facies of the terminal Jurassic (Portlandian) and of their geographic distribution makes possible a rough estimate of the form of the basin of sedimentation. To the south and to the east appear shallow shelves which extend from Moustier-Sainte-Marie to Nice and to the border of the Mercantour [massif], while the region between Sisteron and Puget-Theniers must show a fairly great depth, as emphasized by the importance of submarine slides which have carried toward the center of the basin constituents coming from the shelves.
Contribution a l'etude tectonique de la presqu'ile de Brogger (Spitsberg)
Authors: Barbaroux Lucien
Published: June 2020

New observations on the Brogger peninsula (Spitsbergen) show that the Hecla Hoek (Caledonide) geosynclinal metamorphic complex, reactivated by successive orogenies, overlaps Paleozoic and Cenozoic sedimentary formations in a northwest direction along a continuous front. The role of northwest-southeast-trending deformation in the Hercynian (late Paleozoic) and north-south deformation in the Tertiary assume greater importance than was heretofore accorded them. The existence of an Erzgebirgian (late Carboniferous) and a Saalian (mid-Permian) phase of Paleozoic orogeny can be shown.
A propos des genres Ardeosaurus et Eichstaettisaurus (Reptilia, Sauria, Gekkonoidea) du Jurassique superieur de Franconie
Authors: Hoffstetter Robert
Published: June 2020

The genera Ardeosaurus and Eichstaettisaurus (Reptilia, Sauria, Gekkonoidea) from the upper Jurassic of Franconia (Germany) are defined comparatively. They are assembled under the same family, the Ardeosauridae (incl. Eichstaettisauridae and Yabeinosauridae). The genus Homoeosaurus digitatellus Grier 1914 is assigned to Ardeosaurus. This could perhaps be an adult A. brevipes, but it is kept provisionally in the species A. digitatellus (Grier).
Note preliminaire a la classification des thecidees (brachiopodes)
Authors: Pajaud Daniel
Published: June 2020

A new classification of the thecideids is proposed. The single family Thecideidae Gray 1840 should contain five subfamilies, Lacazellinae (Backhaus), Davidsonellinae n. subfam., Moorellininae n. subfam., Thecideinae (Gray), and Thecidellininae n. subfam. non Elliott.
Precisions sur le genre Bitubigera d'Orbigny 1852 et sur Bitubigera gardettensis nov. sp. (Bryozoa, Cyclostomata)
Authors: Mongereau Noel
Published: June 2020

The study of a topotype of Bitubigera biseriata Philippi, 1843, figured by Reuss in 1864, allows some refinement of the genus Bitubigera d'Orbigny, 1852. The description of a new species [B. gardettensis] from the upper Helvetian [Miocene] of La Gardette, Villedieu (Vaucluse) [France], completes the diagnosis of the genus and its systematic position by the description of the ovicell.
Etude tectonique de la region sud de la Nerthe
Authors: Froget Claude , Guieu Gerard , Roux Max Robert
Published: June 2020

Stratigraphic and tectonic study of the southern Nerthe [Mediterranean coast of France] is based on a sketch map at 1:5,000. The most prominent feature of the region is the presence of the middle and upper Cretaceous, which most commonly forms depressions (B) arranged in synclines or eroded and buried anticlines: to the north under the inverted edge of an anticline (A); to the south, under the front of an overthrust (C). The structure and behavior of units (A), (B), and (C) are defined. Units (A) and (C) had a tendency to be displaced in opposite directions, after sinking of the medial unit (B), becoming somewhat mutually overlapped (the Grand-Vallat). The major fault placing these units in contact is transformed toward the Graffian [highlands] into a complex network of fractures gradually connecting with the Triassic axis of the Rove. Relations with adjacent tectonic units are considered (Etoile overthrust, Marseilles basin). A chronology of the different movements is proposed, from the upper Cretaceous to the Miocene, based on a general examination of the folded zone north of Marseilles.
Structure et evolution de la Sicile occidentale (Madonies et Sicani)
Authors: Broquet Paul , Caire Andre , Mascle Georges
Published: June 2020

After Mesozoic-Eocene sedimentation, distributed in several facies zones, western Sicily was affected by a tectonic-sedimentary phase of evolution. From the Oligocene to the lower Pliocene, subsidence, overburdening, and resedimentation developed, with offsetting toward the south. These phenomena are similar to those observed in the evolution of the southern Algerian Tell region and the outer Apennine ranges.
Stratigraphie continentale et sedimentologie; l'age des couches a 'Bulimus' gerundensis Vidal de la province de Barcelone (Espagne)
Authors: Plaziat Jean Claude
Published: June 2020

Two subunits, lower Eocene (not Paleocene) conglomerates of local origin with Bulimus, middle Eocene conglomerates of distant origin without Bulimus, geomorphic-tectonic deformation
Progres recents dans la connaissance des formations tertiaires du bassin de Paris
Authors: Pomerol Charles
Published: June 2020

Paleogeography, stratigraphy, tectonics, France
Un element de la dorsale betique; le Jabalcon (prov. de Grenade, Espagne)
Authors: Durand Delga Michel , Foucault Alain
Published: June 2020

Jurassic-Cretaceous and Oligocene lithofacies, paleogeography, vertical tectonism
La tillite de la Gara Assaba (bordure sedimentaire sud-orientale de l'Eglab, Sahara occidental)
Authors: Gevin Pierre , Mongereau Noel
Published: June 2020

Lithologic description, upper Ordovician glaciation, Algeria
Chevauchements dans la boutonniere precambrienne de Bou-Azzer-El Graara (Anti-Atlas, Maroc)
Authors: Leblanc Marc
Published: June 2020

Tangential forces, effects on Precambrian basement and Infracambrian-Cambrian cover
Sur le comportement du futur seuil de Bourgogne au Cretace
Authors: Rat Pierre
Published: June 2020

Facies distribution, paleogeography, early Cretaceous emergence, pre-Albian epeirogeny, Tertiary evidence only of ridge development, France
Les plaques stegidiales du brachiopode jurassique Spiriferina
Authors: Cowen Richard
Published: June 2020

The stratigraphic and taxonomic distribution of the remarkable delthyrial structure, the stegidium, has been extended by the discovery in the last spiriferid Brachiopoda known, Spiriferina, from the lower Jurassic of western Europe. The discovery of this structure among the Spiriferinacea confirms the theory that this super family derived principally from the impunctate Spiriferacea rather than the punctate Suessiacea.
Nouvelles donnees sur les facies de l'Oxfordien dans le nord des chaines iberiques (Espagne)
Authors: Bulard Pierre Francois
Published: June 2020

Northern extension of sponge-bearing formations, lower Oxfordian hiatus, correlations, upper Jurassic
Structure et morphologie de la région de Montevago (Sicile occidentale)
Authors: Mascle Georges
Published: June 2020

Sommaire

La terminaison occidentale des monts Sicani montre une structure faillé, en particulier sur sa bordure septentrionale. Les failles qui forment le faisceau de Montevago ont joué à plusieurs époques, particulièrement après le dépôt du Calabrien. Par la suite, la région a subi une érosion continentale qui a élaboré une surface de type pédiment. Des déformations récentes de cette surface d'érosion témoignent de la persistance de l'activité tectonique.
La microlinéation des schistes ardoisiers. Méthode d'étude photon1étrique
Authors: Le Corre Claude
Published: June 2020

Sommaire

Dans certains schistes ardoisiers les minéraux possèdent, dans le plan de schistosité, une direction préférentielle d'allongement déterminant une microlinéation visible seulement au microscope. La méthode de mesure proposée consiste à définir, sur des lames minces orientées, la direction statistique d'extinction des minéraux grâce à un dispositif photométrique. Sur un exemple pris dans Massif armoricain, il est montré que la microlinéation ainsi déterminée est parallèle aux axes B des mégastructures dans la région considérée.