bluuebunny/crossref_metadata_2025 huggingface dataset:
Sur les mineralisations en plomb-zinc et en antimoine de la peripherie du Mont-Lozere
Authors: Bouladon Jean
Published: March 2020

Lead-zinc deposits occur along the borders of Mont-Lozere, a Hercynian granitic horst in the Central Massif region, France. Mineralization accompanied uplift of the horst in Tertiary time and took place in several phases. One of the late near-surface phases was characterized by the development of antimony-rich sphalerite.
Geologie des unites situees entre l'autochtone de l'Argentera et les couches triasiques du Monte Vecchio (province de Cuneo, Italie)
Authors: Guillaume Andre
Published: March 2020

The autochthonous formations of the Argentera massif form the base of the Col de Tende unit in Cuneo province, Italy. The Cretaceous beds of the unit are well developed to the northwest, but are absent to the southeast as a result of pre-Lutetian erosion. Toward the northwest the Col de Tende unit becomes more plastic and underlies overthrust units. Some of the latter show facies of Triora-type units, while others exhibit a facies hitherto unknown among the Subbrianconnais units. The contact with the Triassic of the Monte Vecchio unit is marked by a crush zone in beds exhibiting facies of the basal complex of the Helminthoid Flysch nappe.
Subsidence et enallaxie; deux phenomenes qui president aux depots steriles et phytogenes du Stephanien de Lons-le-Saunier (Jura)
Authors: Lienhardt Georges
Published: March 2020

The Stephanian (Carboniferous) barren measures of the Lons-le-Saunier basin, France, consist of two large groups of rocks. Those of the first group are feldspathic and are the product of the breakdown of denuded parent rock; those of the second group, without feldspar, are derived from soil which had developed on similar parent rocks. Enallaxy is the alternation of these two types. Accumulation of the barren measures can be explained in terms of slow and continuous subsidence. Formation of coal seams, however, requires the conditions resulting from more or less sudden subsidence.
Le bassin oligocene de Bagnasco (Italie, prov. de Cuneo)
Authors: Lorenz Claude
Published: March 2020

The Bagnasco basin in Cuneo province, Italy, is filled largely by coarse detrital sediments overlain, in the vicinity of Bagnasco only, by a marly formation preserved in a small graben. These sediments are continental in character and poor in fossils; they can be attributed mainly to the Stampian and Chattian (Oligocene).
Evolutions paralleles de series de rhyolite et d'arkose soumises a l'action d'un metamorphisme topochimique
Authors: Bouvet Michel , Reboul C.
Published: March 2020

Thick rhyolitic and arkosic formations outcrop in the Pharusian basin east of the Adrar Timg'aouine horst in the central Ahaggar mountains, Algeria. The rhyolites have been considerably recrystallized, and locally are almost granitic in facies. Small sheets of essentially syntectonic granites, microscopically and chemically resembling the recrystallized rhyolites, are also present in the basin. The arkoses have also been substantially recrystallized and in the cores of anticlines resemble granites; the end products of recrystallization of the rhyolites and arkoses can hardly be distinguished by the eye, and with difficulty under the microscope; chemical analysis is necessary to settle the question of their origin.
Les charnockites et les roches associees du Suggarien a facies In Ouzzal (Sahara algerien)
Authors: Giraud Pierre
Published: March 2020

Rocks of the In Ouzzal facies in Suggarian (Precambrian) complexes of the Sahara of Algeria comprise a charnockitic complex consisting essentially of pyroxenites, gneisses, plagioclasites, "granites," and "syenites" (lamboanites), with interstratified masses of crystalline limestone with silicate nodules, garnet and graphite gneisses, and "leptynites" with blue quartz. The structural arrangement of the In Ouzzal formations is totally different from that of ordinary Suggarian formations. Their eastern boundary is a large fault, whereas their western boundary is not a clear-cut fracture. Southward there appears to be a gradation into ordinary Suggarian rocks.
Paul Fallot (1889-1960); sa vie, son oeuvre
Authors: Durand Delga Michel
Published: March 2020

A biographic account of the French structural geologist P. Fallot, who taught at the College de France until his retirement and did much work in Spain, the Alps, north Africa, and elsewhere. A bibliography (321 titles) is appended.
Remarques preliminaires sur la faune de brachiopodes du Zemmour (Mauritanie)
Authors: Drot Jeannine
Published: March 2020

Describes several Devonian brachiopods (including new species and varieties) from the Zemmour region of Mauritania, not previously reported from north Africa or the Sahara.
La salinite de l'eau intersticielle des sediments de l'estuaire de la Loire
Authors: Berthois Leopold
Published: March 2020

The estuary of the Loire river, France, is divided into three zones on the basis of the salinity of interstitial waters of the bottom sediments.
Un troisieme exemplaire d'Imhoffius lutetianus Chabanaud
Authors: Patte Etienne
Published: March 2020

The two known specimens of Imhoffius lutetianus were from unrecorded sources, but Abrard was able to identify the associated sedimentary material as from the Royal bed of zone IV of the Lutetian in the region of Nanterre, Courbevoie, or Puteaux. The third specimen is from an old collection, with source unrecorded but unquestionably from the same zone IV of the Lutetian a little above the Royal bed horizon. Some details are shown in the third specimen that were not determinable in the others, thus verifying species.
Contribution a l'etude geomorphologique du nord-est du Bresil
Authors: Meunier Andre R.
Published: March 2020

A region of 40,000 km 2 in the States of Pernambuco, Paraiba, and Rio Grande do Norte in northeastern Brasil, drained to the north by the Piranhas river and to the east by the Paraiba river, exhibits a series of Cenozoic erosion levels showing the morphologic characteristics of littoral and interior zones. Rocks of the region are a poorly-known Precambrian complex attributed to the Algonkian. In the semi-arid western half of the region, west of the meridian of Campina Grande, are the Chapadas, Soledad, and Patos levels, respectively at 830-650, 600-550, and 300-250 m elevation. In the eastern half of the littoral region are the Borborema and Umbuzeiro surfaces, the probably Pliocene Tabuleiros gently sloping from 200 to 20 m at the seacoast, and the Itabaiana surface at about 90 m. These features reflect successive border flexures of the Brazilian shield, and progressive accentuation of an enormous fold at depth.
Remarques sur l'evolution tectonique de la Sicile
Authors: Caire Andre
Published: March 2020

Recent work has shown that North African structural and paleogeographic features appear to extend into Sicily and southern Calabria. However, it has not yet been determined whether identical tectonic evolution occurred, or if it is merely analogy. Of many hypotheses, two seem most in accord with observed facts: the ultra-nappism and overthrusts of reduced size. Ultra-nappism is analyzed in detail. The second hypothesis would be favored if the Numidian and Cretaceous flysch are parautochthonous or little displaced by thrust faulting. In this case, structural events would be chiefly in the Tertiary instead of in both Tertiary and Mesozoic.
Contribution a l'etude geologique de la chaine calcaire des monts Peloritains (zone de Militello-Tortorici), Sicile nord-orientale
Authors: Duee G.
Published: March 2020

The limestone chain of the Peloritani mountains in northeastern Sicily is made up of several tectonic units differing stratigraphically, and complexly thrust-faulted into various anomalous positions. The Longi (or lower) unit and its eastern extension, the dolomitic unit, comprise 250-300 m of red quartz conglomerate of pre-Liassic age; 500 m of Jurassic limestone and dolomite concordant on the conglomerate; and about 300 m of upper Jurassic-Cretaceous-Eocene marl and limestone. In the Longi unit, a thick molasse of early Tertiary age also occurs. The Galati unit consists of phyllite overlain unconformably by various facies of Mesozoic limestone, dolomitic limestone, marl, and conglomerate. The red limestone unit comprises upper Cretaceous marl overlain by lower Jurassic limestones, Eocene beds transgressive over both, and Oligocene-Miocene molasse at the top. The tectonic relationships of these units are highly complicated. Much thrusting probably occurred prior to deposition of the molasse. Jurassic-lower Cretaceous flysch on the south has been overridden by the chain, but the age of this thrusting is problematic. The molasse seems to have been deposited transgressively over all other formations and tectonic units, but some important tectonic deformation certainly is post-molasse and part is Quaternary.
Apercu morphotectonique et paleogeographique du domaine calabro-lucanien (Italie meridionale)
Authors: Grandjacquet Claude
Published: March 2020

In the region lying between Salerno and the Ofanto river on the north and Cetraro and the gulf of Tarento on the south and southeast, the south end of the Apennines merges into the structural pattern of the western Mediterranean region (southwestern Italy-Sicily-North Africa). After a cycle of sedimentation, tectonic deformation, and erosion extending from Triassic to upper Oligocene, a second cycle began in the late Oligocene and earliest Miocene. Mosaic faulting, in general based upon major structural features of the earlier cycle, occurred throughout the entire southern Italy-North African region. The age of the quartzite flysch remains unknown but is probably Jurassic-Cretaceous.
Additions a la faune reptilienne de l'Eocene superieur de Mormont-Saint-Loup (Suisse)
Authors: Hoffstetter Robert
Published: March 2020

A review of the upper Eocene vertebrate fauna from the Mormont (Mauremont) and Saint Loup localities, Vaud, Switzerland, has resulted in the description of a new reptilian form, Paraxestops stehleni n. gen. n. sp. The close similarity of the new genus to the North American genus Xestops suggests close affinities between European and North American lacertiform faunas. Reexamination of indeterminate vertebrate remains from the Entreroches locality reveals the presence of the upper Ludian amphibian Megalotriton. Mammals and other reptiles previously collected from the area are listed and briefly described.
Contribution a l'etude stratigraphique du Purbeckien-Wealdien de la region de Santander (Espagne)
Authors: Rat Pierre
Published: March 2020

The series between the marine Callovian and marine Aptian is divisible into a lower and an upper group. The lower group is predominantly limestones, marls or clays, and rare sandstone. Fossils collected from the unit suggest lacustrine or brackish water deposition of the Purbeckian. Sediments of the upper group--sandy shales unconformable on the lower group--originated from the neighboring continental surfaces. Since only fossil imprints were found, the group is dated as Wealden on the basis of the underlying and overlying units. Calcareous sponges and limestone facies with bryozoans and sponges are illustrated and briefly described from the localities studied. Iberina lusitanica (foraminifera) and Dictyocythere aff. mediostricta (ostracode) are described and figured.
Quelques aspects des conditions de depot du flysch
Authors: Rech-Frollo Marguerite
Published: March 2020

Analysis of the Niesen flysch between Le Sepey and Mosses lake does not confirm the deep-water bathymetry commonly attributed to flysch deposits. The juxtaposition of organic material over continental alluvium--a typical flysch characteristic--was observed only at shallow depths. The muddy sands, source of the flysch deposits, are actually formed at shallow depths. Bird tracks reported from certain flysch beds also suggest shallow-water origin for the deposits. Cross currents produced after periodic disruption of tectonic and climatic equilibria in parts of a marine basin corresponding to the continental platforms explain the mechanical sorting of the organisms and detrital material as well as the granoclastic structure of the flysch. After deposition of the flysch and before its compaction orogenic mobility at the bottom of the basin affected the petrography of the flysch causing corrosion of the quartz and feldspars at the moment of consolidation. Evidence presented by proponents of a deep-water origin for the flysch deposits--based on foraminifera and the petrographic and paleo-oceanographic characters of the deep-water sands--is reviewed.
La sizunite (cap Sizun, Finistere) et le probleme de l'origine des lamprophyres
Authors: Cogne J.
Published: March 2020

Sizunite, a micaceous lamprophyre including small granitic xenoliths, is found in a NW-SE trending vein in granites of the Hercynian orogeny (western France). The xenoliths are of two types--numerous small globular forms containing biotite, and less abundant angular forms containing two micas. The sizunite is distinguished by its extreme richness in potassic elements and by the fact that microcline is the only feldspar present. Chemical analysis shows that this rock is the most potassic and phosphoric of the 382 lamprophyres known. Results of modal analyses and micrographic studies classify it in the alkalic syenite group. It is probably the product of selective assimilation of certain granitic elements by a deep-seated basic magma, related to a late orogenic phase. The magma contaminated itself while cutting across freshly folded and granitized, mesothermal sial.
Sur la serie metamorphique de Velez-Malaga (province de Malaga, Espagne)
Authors: Boulin Jean
Published: March 2020

Four major petrographic facies are distinguished along the Malaga-Motril road between Torre de Mar and Nerja (Spain)--sericite schist, mica schist, gneiss, and lenticular gneiss facies. The mechanical forces which caused the fold and boudinage structures affecting the feldspathic mica schists and the mica schists with andalusite occurred contemporaneously with, if not before, the albitization of the Velez series. The sericite schists have been correlated with certain Triassic series, leading to the proposal of a post-Triassic age for the metamorphism of the Velez series. Two phases of crystallization are recognized in the petrogenesis of the Velez-Malaga crystalline schists: transformation of an older sedimentary series by intense metamorphism, and albitization of the resultant metamorphic series related to major sodic metasomatism.
Une impregnation plombo-zincifere dans les tufs rhyolitiques de la Finosa, pres Ghisoni (Corse)
Authors: Aicard Pierre , Azas Henri , Bouladon Jean , Sainfeld Paul
Published: March 2020

The Finosa locality, 4 km east of Ghisoni (central Corsica), is situated in the northern part of a series of pyroclastic and detrital formations of probable Permian or upper Carboniferous age. The section studied includes ignimbrites with long sinuous xenoliths of recrystallized rhyolitic glass, alternating green and red tuffs, agglomerates, arkoses, breccia, and limestone. The mineralization is stratiform, emplaced by substitution in the rhyolitic tuff at the expense of the vitreous matrix. Mineralization in the green tuffs was arrested by the lateral passage to the red facies. The main locality is situated where the tuffs are crushed by a protuberance from the roof of the underlying granite basement complex. The Finosa mineralization exhibits marked vertical zonation. The minerals encountered are listed according to their relative abundance showing a predominance of sphalerite and galena. These mineralized deposits are classified as mesothermal beds impregnated and substituted in the collapse zones of the siliceous rocks. The mineralization is related to the terminal phases of the Hercynian orogeny.
Nouvelles donnees stratigraphiques et tectoniques sur le corridor de Boyar (province de Cadix, Espagne)
Authors: Chauve Pierre , Hoppe Peter
Published: March 2020

A stratigraphic study of the penibetic and subbetic series shows that the two are quite different. The subbetic--northern Boyar corridor--includes a well-developed Liassic with marly facies, a red nodular Tithonian, a Cretaceous, and a limestone-marl Eocene. In the penibetic, southern part of the Boyar corridor, the middle and upper Jurassic contain limestone units with coralligenous facies; and the middle Cretaceous is directly transgressive on the Tithonian limestones. The two series correspond to two distinct sedimentation regimes. Comparison of the different beds in the area indicates that the beds of the Los Majales and Fresnillo chains belong to the same stratigraphic and tectonic unit whose facies are totally different from the subbetic and are only slightly analogous to the penibetic. The northward thinning of the penibetic and the presence of Aptychus breccias and Tithonian belemnites in the Penon Grande area indicate the progressive passage of the penibetic into the Majales-Fresnillo beds which override the subbetic. These beds may have originated either from a zone between the penibetic and the Malaga nappe, or from a region more to the south in the sedimentation domain of the flysch nappes.
Forme des grains de quartz de sables et gres du Bresil
Authors: Bouillet Genevieve , Cailleux Andre
Published: March 2020

A total of one hundred ten samples of quartz grains, two-thirds of them from the southern and northeastern coastal regions and the lower Amazon valley, from sands and sandstones ranging in age from Precambrian to Recent have the same general characteristics found on other continents. Wind-worn grains are characteristic of the Devonian, Carboniferous, and Triassic. Water-worn grains are particularly abundant in the Tertiary of the Amazon basin. Grains in the Precambrian Minas Gerais series are unusally limpid and show relatively little wear. The tillite of the Carboniferous Itarare group in the southern coastal region contains abundant wind-worn grains of periglacial origin.
Dolerites intrusives dans le Lias et le Dogger d'Andalousie: leurs differenciations pegmatitiques alcalines et aureoles de metamorphisme
Authors: Busnardo Robert , Chenevoy Maurice
Published: March 2020

Three newly-discovered occurrences of upper Dogger (?) (middle Jurassic) dolerite in upper Lias to Dogger (Jurassic) formations of the Priego de Cordoba area of southern Spain resemble other dolerites of the region. The Las Navas dike and the Buitron sills are in Dogger marl, and the Las Lomas sill is in upper Lias (lower Jurassic) limestone. The contact metamorphic zones are proportional to the thickness of the tabular bodies, and exhibit only thermal characteristics. The thick Las Lomas sill transformed the initial six meters of overlying limestone to garnetiferous marble. Leucocratic enclaves of pegmatite are characterized by about 58 percent SiO 2 as contrasted with about 50 percent in the dolerite.
Les ecailles du Devancon, a l'ouest de Rians (Var)
Authors: Rousset Claude
Published: March 2020

The northwestern part of the Rians syncline in southeastern France is overridden by the adjacent part of the Vautubiere anticline. Erosion of the overthrust mass left the Devancon hill as a rootless, internally thrust-faulted mass of Hauterivian (lower Cretaceous) limestone and marl, and Rognacian (upper Cretaceous) limestone and sandstone resting upon Eocene marl of the syncline.
Le massif de roches eruptives basiques et ultrabasiques de Laouni-Ouest (Hoggar meridional)
Authors: Donville Bernard
Published: March 2020

Gabbros, peridotites, and associated basic and ultrabasic rocks form the constituent rock types of the Laouni-Ouest massif in the southern Ahaggar mountains, Algeria. Details of their chemistry are reported. Study of the structure of the massif and relationships with the surrounding terrain leads to the conclusion that emplacement took place in a definite period of the Pharusian (Precambrian), following the major phase of folding but prior to the extensive granitization responsible for transformation of Pharusian crystalline schists.
Sur le Cretace superieur du Devoluy (Hautes-Alpes) et ses relations avec les regions voisines
Authors: Dubois Roland , Fontes J. C.
Published: March 2020

Six units are recognized in the upper Cretaceous section of the Devoluy massif in the French Alps. Their sequence and relationships are discussed, and it is noted that the section is essentially identical to that of the Vercors massif.
Sur la classification des cotes
Authors: Ottmann Francois
Published: March 2020

On the basis of topographic relationships between the emerged and submerged parts of coasts and between littoral and continental platform profiles, a classification scheme is proposed for coasts in which five principal morphologic types are distinguished. Examples of the different types are given.
Le Stampien et l'Aquitanien ligures
Authors: Lorenz Claude
Published: March 2020

Facies of transgressive deposits in Liguria (Italy) are so uniform that former stratigraphic divisions were based on rock type boundaries which cross time boundaries. On the basis of the fauna, the earlier work is corrected and the Sannoisian is reclassified as a lagoonal facies of the lower Stampian. Other formations, attributed to Stampian and Chattian are now assigned to the Aquitanian. Further stratigraphic revision places the transgression onto the Volta group between the lower and upper Stampian, while further to the west, transgression onto the northern slopes of the Ligurian Alps did not occur until the lower Aquitanian. Extensive folding and faulting occurred in the area during the Stampian and Aquitanian.
Sur les variations d'age et de facies des formations tertiaires sur la bordure meridionale des monts Peloritains (Sicile)
Authors: Truillet Rene
Published: March 2020

An Eocene series of calcareous schists and fine grained micaceous sandstones known as the Piedimonte formation in the Zambataro valley of Sicily (Italy) is identical to the Reitano flysch series. A NW-SE trending fault throws the Piedimonte up against the Oligocene to Miocene Peloritani molasse at its southeastern extension. Both formations are unconformably overlain by the Monte Soro flysch. In those areas where the Piedimonte has not been faulted, it is not affected by the Miocene tectonics that deformed the Reitano flysch.
Neritopsis legrosae, espece nouvelle de gasteropode du Dogger italien
Authors: Bourrouilh Robert , Rasplus Leopold
Published: March 2020

A new species of lower Bajocian gastropod, Neritopsis legrosae, is described. The specimen was found in the Castello Terino region of Italy, 55 km northeast of Trento. The test is nearly planispiral, with a differentiated umbilicus. It has a large last whorl and a large round aperture. The ornamentation consists of eight transverse ribs and five regularly spaced major longitudinal ribs with numerous minor longitudinal ribs in between. Transverse striations cross the longitudinal ribs to form a lattice pattern. This specimen seems to agree with the generalization that the more closely planispiral the test becomes, the more differentiated the umbilicus tends to become. Neritopsis legrosae moderately resembles Neritopsis planispira Gamellaro but has different ornamentation.
Tectoniques superposes et metamorphisme dans la bande cristallophyllienne d'Aracena (province de Huelva, Espagne)
Authors: Bard Jean Pierre
Published: March 2020

Structural analysis of the Paleozoic formations of the Aracena metamorphic belt reveals the presence of four main deformational phases all of which belong to the Hercynian orogeny: a first phase of NW-SE synmetamorphic isoclinal folds overturned toward the southwest and penecontemporaneous with migmatization; a second phase of WNW-ESE orthorhombic folds with axes slightly overturned toward the south-southwest, accompanied by S 2 schistosity fracture and late epizonal granitic intrusion; a third phase of thrusting and shearing toward the south-southwest; a fourth phase of NE-SW displacements measurable in kilometers. Estimation of the geothermal value of the synmetamorphic phase ( nearly equal 80 degrees C/km) places the Aracena belt among the high temperature-low pressure types.
La tectonique et la geologie de la partie orientale du bouclier bresilien
Authors: Suszczynski Edison F.
Published: March 2020

The Brazilian shield comprises two separate units. The Precambrian crystalline basement, in the eastern part of the shield, is divided into three parts distinguished by their lithology, structural trend, and mineralizations. The sedimentary cover contains a folded series of formations ranging in age from terminal Precambrian to early Paleozoic and an unfolded series represented by sediments of lower Devonian to Tertiary age which were deposited in epicontinental, intracratonic, and coastal basins. Four phases are recognized in the evolution of the unfolded sedimentary series. The effects of geologic processes active in the Brazilian shield from the end of the Precambrian to the end of the Mesozoic have been observed in the Parnaba-Sao Francisco intracratonic geosyncline. Results of age determinations are reported.
Variation intraspecifique chez Goniothyris buckmaniana (Walker-Davidson), terebratule du Dogger inferieur (Moyen Atlas, Maroc)
Authors: Rousselle Lucienne
Published: March 2020

Continuity in the distribution of the morphologic characters of terebratulids from two samples has led to the reduction of the long-established taxa phillipsiana and lowensis from specific to infraspecific rank. The taxon buckmaniana, usually considered in Europe as a variety of Lobothyris buckmani, seems to be, in the Middle Atlas, completely unrelated to this species. The morphotypes lowensis, buckmaniana, and phillipsiana are considered as parts of a polytypic species which evolved in the Dogger [Jurassic] and may be related to Goniothyris. The influence of ecologic factors on the modification of the morphotypes and on their distribution in this species is noted.
Les relations entre le domaine peloritain et le flysch du Monte Soro aux environs de Roccella Valdemone, et le probleme du charriage des Peloritain orientaux (Sicile)
Authors: Caire Andre , Truillet Rene
Published: March 2020

Faulting, Peloritani zone thrust over Monte Soro flysch, eastward extension of thrust zone
Les alterations a la base du continental intercalaire, Cretace inferieur, du Tidikelt occidental (Sahara central)
Authors: Conrad Georges , Conrad Jacqueline
Published: March 2020

Continental intercalaire, post-Paleozoic peneplanation phenomena, basal breccia, lower Cretaceous, Algeria
Etude micropaleontologique et stratigraphique de l'Eocene marin du Mont-Cayla (Aude) et des ecailles de Saint-Chinian (Herault)
Authors: Toumarkine Monique
Published: March 2020

Lithofacies, microfaunal zones, west to east replacement of lacustrine by marine sediments, France
L'Urgonien de Sault (Vaucluse)
Authors: Masse Jean Pierre
Published: March 2020

Lithofacies, Barremian biomicrite, Bedoulian bioherm, paleo-oceanography, lower Cretaceous, France
Charophytes de l'Oligocene superieur de Marseille
Authors: Castel Monique
Published: March 2020

Systematic descriptions, Rhabdochara praelangeri n. sp., upper Stampian-Chattian, France
Etude stratigraphique et structurale du bassin tertiaire de Malaucene
Authors: Demarcq Gerard , Truc Georges
Published: March 2020

Eocene-Miocene lithostratigraphy, tectonic phases, paleogeography, France
Le volcanisme tertiaire de la region toulonnaise (Var)
Authors: Coulon Christian
Published: March 2020

Alkalic basalts, coexisting labradorite and anorthosite, chemical analyses, stratigraphic relations, upper Pontian (Miocene) or lower Pliocene, France
Les variations de facies de l'Eocene moyen de la lame de San Fratello (nappe du flysch du Monte Soro, Sicile nord-orientale)
Authors: Duee Gerard , Truillet Rene
Published: March 2020

Southward transport of detritus, lithofacies, lateral and vertical variations, description of outcrops
Resultats de nouvelles observations a l'est des Hedil (Tunisie septentrionale)
Authors: Kujawski Henri
Published: March 2020

Transgressive Tertiary strata, revised tectonic interpretation, overthrust units
Existence de plissements superposes dans le Precambrien de l'Aleksod (Ahaggar oriental)
Authors: Bertrand Jean Michel L.
Published: March 2020

Pharusian unconformity, tangential movements, tectogenesis, lithology, Algeria
Deux nouvelles especes de Tetrarhynchiinae (rhynchonelles) dans le Lias moyen du Causse moyen-atlasique (Maroc)
Authors: Rousselle Lucienne , Bisch Jean Philippe
Published: March 2020

Systematic descriptions, comparison with Gibbirhynchia species, middle Domerian, upper Carixian
Observations sur les structures internes et le developpement des Microcodium
Authors: Lucas Gabriel , Montenat Christian
Published: March 2020

Algae, Eocene, France
Gradients cristallogenetiques dans l'espace et dans le temps
Authors: Deicha Georges
Published: March 2020

Microscopic observation of the development of crystal nucleii and growth provides a better understanding of the heterogeneity of crystal structure and composition. The crystallogenetic disequilibrium of diamonds is clearly illustrative under high pressure conditions. The laboratory studies can be related to differences in magmatic and hydrothermal environments and their effect on mineralization.
Sur quelques genres de Madreporaires peu connus de l'Argovien superieur suisse
Authors: Beauvais Louise
Published: March 2020

Several rare genera from the Discothomosphinctes warte horizon of the Bernese Alps of Switzerland were placed in the Cyathophyllidae family by Koby, who considered them closely related to Paleozoic Madreporaria. These genera subsequently were placed in the Mitrodendronidae family by Alloiteau. Recent study of the type species of these genera indicates revisions are necessary. Lingulosmilia and Sclerosmilia are identical to Cheilosmilia. Cheilosmilia kobyi n. sp. is described from the upper Argovian (upper Jurassic). A new genus Schizosmiliopsis of the Stylinidae is proposed, and Schizosmiliopsis corallina (Koby) is proposed for Koby's Schizosmilia corallina. His genus Schizosmilia is left uncertain because the type specimen has disappeared.
A propos de Flabellothyris oranensis (Flamand), brachiopode du Dogger moyen
Authors: Rousselle Lucienne
Published: March 2020

A critical restudy of the brachiopod Flabellothyris oranensis from Si Slimane ben Moussa in northwestern Algeria, and various places in the eastern High Atlas and Middle Atlas mountains of Morocco, with respect to its vertical stratigraphic range and its relationships to associated fauna indicates Dogger (middle Jurassic) age--perhaps upper or terminal Bajocian, or lower Bathonian. The species is redescribed in accordance with the material at hand. Attention is called to the similarity between F. oranensis and F. dichotoma of the Bathonian (upper middle Jurassic) and Callovian (lowermost upper Jurassic) of India and Madagascar.
Une naiade geante (Lamellibranche limnique) dans le 'continental intercalaire' du Niger (Sahara meridional)
Authors: Mongin Denise
Published: March 2020

A new species of pelecypod of exceptional size, Cuneopsis giganteus n. sp., is described from the top of the middle Irhazer horizon (Wealden, Cretaceous) near the In Abangarit oasis of the Agades region of Niger in the southern Sahara.
Le Cretace des environs de Chabrieres (Basses-Alpes)
Authors: Thomel Gerard
Published: March 2020

The results of lithologic and paleontologic study of Cretaceous rocks of the Vocontian facies demonstrate that the massive upper Jurassic limestones are separated from Valanginian (lower Cretaceous) deposits by an erosion surface. Two series distinguishable in the Valanginian include a lower zone of marls and limestone containing a Berriasian fauna, and an upper zone of marls and limestones, less compact than those below, containing an upper Valanginian fauna. The Hauterivian is represented by a transitional zone of marls and limestones overlain by blue fossiliferous marls. The passage to the Barremian (lower Cretaceous) is transitional, marked by a zone resembling the thick-bedded Barremian limestones in which two members are recognized --thick-bedded limestone with interbedded schistose marl and fossiliferous marls and limestones with Emericiceras and Acrioceras in the lower part, and Holodiscus above. The uppermost Barremian bed is corroded, corresponding to an interruption in sedimentation. This surface is directly overlain by lower Albian-upper Aptian black marls, glauconitic in the upper part. Blue marls with Pervinquieria represent the Vraconian (upper Cretaceous). The Cenomanian, sparsely fossiliferous, is represented by blue marly limestones, sandstones and glauconitic sandy limestones. The Chabrieres Cretaceous series resembles the neritic facies to the south and the surrounding Vocontian domain. Sedimentation in the area is a result of slow uplift and subsidence, especially in the Valanginian.
Datation absolue des principales industries prehistoriques
Authors: Cailleux Andre
Published: March 2020

Recent research has shown that the last glaciation (Wuerm) was approximately 10,000-50,000 yrs B.P., and that the Quaternary is older than previously thought. Its lower limit is placed at the beginning of the Villafranchian--approximately 1,000,000 yrs B.P. The durations of the major prehistoric episodes are presented in a table illustrating their progressive acceleration in time, each episode being shorter than the preceding one. If this acceleration continues, the end of the Quaternary might fall around the year 2200 A.D.
Etude comparative des sables de la region de Saint-Prest (Eure-et-Loir)
Authors: Ayanian Paul
Published: March 2020

Sedimentological study of the sand deposits of Saint-Prest and Bercheres-la-Maingot permits a comparison of the Villafranchian Saint-Prest and Thimerais sands. Results of granulometric analyses reveal the predominance of coarse elements in the Saint-Prest deposits as opposed to the pelitic elements in the Clous Gaillards and Bercheres sands. The Bercheres sands are considered to be eolian due to the large proportion of dull, rounded grains; the Saint-Prest sands are fluviatile as indicated by the majority of glossy, blunted fragments. Although the Clous Gaillards sediment is less evolved than the Bercheres, it may also be an eolian deposit. Cumulative granulometric curves are included with a table giving the granulometric characteristics of the nine samples studied.
La periode glaciaire dans l'ouest des Pyrenees centrales franco-espagnoles
Authors: Barrere Pierre
Published: March 2020

Small glaciers of the true alpine type formed on the lower slopes of the northern Pyrenees. The morainic arcs left by these tongues are in contact with the diffluences of the principal glacier, indicating that these small glaciers descended before the main glacier reached the valley. The major valleys of the northern slope were occupied by tongues with multiple diffluences of the present Himalayan type. The larger glaciers, similar to the Alaskan type, extended in lobes onto the piedmont. The external moraines of these glaciers are Rissian as indicated by their relationship with the principal fluvioglacial terrace. The erratics on the slopes above and in front of the frontal moraine are related to an expansion phase of the Rissian glacier rather than to a separate advance because their morphoscopic and petrographic characteristics do not differ from the frontal morainic deposits. The internal moraines, by comparison with the Alps, can be attributed to the Wuerm. The volume of these deposits is less than the Rissian glaciers due to reduced morphologic activity in the Wuerm--especially on the southern slopes--and to the general retreat of glaciers prior to a long interglacial period.
Les depots fluvio-glaciaires du Bas-Dauphine; leurs mineraux argileux, leur radioactivite
Authors: Martin Annie
Published: March 2020

X-ray analysis of the clay fraction of Wuermian fluvioglacial deposits of Bas-Dauphine (Bievre-Valloire, France) shows a predominance of illite, lesser amounts of chlorite, and traces of kaolinite. The Mindel-Riss sediments also contain illite and kaolinite along with interstratified minerals and swollen illite. Formation of the two latter elements was favored by circulation of ground water which produced neogenesis in the same sedimentation medium. The Mindel-Riss sediments can be distinguished from the Wuerm sediments by their radioactivity--32-39 counts/min. and 12-16 counts/min., respectively.
Etude sedimentologique de quelques depots quaternaires marins entre Nice et Grimaldi
Authors: Miskovsky Jean Claude
Published: March 2020

Samples studied correspond to the former levels of the sea recognized in the Quaternary deposits between Nice and Grimaldi (southern France). The highest level recognized is at 165 meters, representing the end of the Pliocene; the second level, at 108 meters, represents the Calabrian; deposits at 90 meters are early Quaternary; the sea level at 30 meters is also early Quaternary--pre-Mindel-Riss; deposits at 11 meters correspond to the type Tyrrhenian (Riss-Wuerm). Granulometric analysis of elements less than 35 microns shows that the littoral deposits have a smaller proportion of fine elements than those deposited under several meters of water. The beach pebbles and littoral deposits contain poorly sorted coarse sand, while above, the wind-deposited marine sand is fine and well-sorted. These sediments belong to an interglacial period when eolian forces were minimal--a conclusion based on the scarcity of round, dull quartz grains. Granulometric curves are included.
Comparaisons des grandes etapes morphogenetiques du Quaternaire dans le Midi mediterraneen francais et au Maroc
Authors: Raynal Rene , Tricart Jean
Published: March 2020

Comparison of continental Quaternary deposits shows a parallelism between the chronology and morphogenesis of the Quaternary in Midi (southern France) and Morocco (north Africa). In Midi, three totally different regions are distinguished by their paleoclimates: the Roussillon area, characterized by a relatively dry climate; the Languedocian wastes, where the cold winters were often violent with radical temperature changes; and the Provence Prealps, where the basins were sheltered but benefited from higher summer humidity than in the Roussillon area. The Moulouyan pluvial (upper Villafranchian) is represented in Morocco by periglacial climate and extreme temperature changes, and in the Alps, by a major glaciation. The Saletian pluvial (Guenz) was cold and humid in both areas with strong regional contrasts between the three Midi regions. The Amirian (Mindel) in Morocco was warm and pleasant with a predominance of chemical alteration. In Midi, however, there was harsh cold, a contrast possibly due to a difference in atmospheric circulation. The Tensiftian pluvial (Riss) in Morocco was extremely cold with widespread glaciation. In Midi a periglacial climate prevailed with the formation of congelifraction gravels. The Soltanian (Wuerm) was less cold in both areas; in Morocco erosion decreased while in Midi there was an increase with no interruption in pedogenesis. The Holocene is represented in Morocco by an accumulation of terrace deposits and increased pedogenesis, and in Midi by decreasing stream erosion and deposition of sandy material.
L'inter Mindel-Riss dans l'Apennin central
Authors: Demangeot Jean
Published: March 2020

Examination of sections in the vicinity of the Gran Sasso chain (northern Italy) has provided data leading to the determination of the inter-Mindel-Riss paleoclimatic evolution. The presence of calcite in rock fissures and on ancient soil surfaces indicates that an interglacial period followed the last cold of the Mindelian--a period of rapid warming which caused the calcite to be precipitated. The formation of travertine can also be attributed to this phase. Clays deposited in the low areas contain abundant organic matter suggesting the continuation of warm, humid conditions in which vegetation developed and pedogenesis progressed. The heat and humidity increased, causing the limestones to dissolve completely to decalcification clays. The ironstone caps observed in the Guimentina valley mark the end of the evolution. After this a climatic crisis developed which involved semitropical processes and mechanical erosion by running water.
Observations sur des formes et depots quaternaires en Syrie
Authors: Dresch Jean
Published: March 2020

Three levels of Quaternary glacial erosion are recognized on the Senonian and lower-middle Eocene marls and limestones which crop out on the flanks of the discontinuous SW-NE folds of the Palmyran chain. These levels are preserved by expanses of debris and by caliche. They are comparable to deposits described from north Africa and are indicative of a humid climate. Jabal Hayane and Jabal Kehnzir are typical examples of the Palmyran folds. The anticlines are asymmetrical, closed, and composed of Cenomanian and Turonian limestones. They are often faulted, exposing the underlying gray Aptian sandstones and Bathonian evaporites and clays. The synclines, larger than the anticlines, are formed in Senonian and Eocene strata and are sometimes broken by cuestas of middle-upper Eocene limestones.
Quelques precisions sur les classifications du Quaternaire marocain
Authors: Biberson Pierre
Published: March 2020

Recent examination of Quaternary stratigraphic sections at the Sidi Abderrahman quarry and at Casablanca (Morocco) resulted in the definition of two episodes: the Harounian stage, a marine transgression equivalent to the Mediterranean Eutyrrhenian; and the pre-Soltanian substage of the Soltanian. The continental pre-Soltanian deposits are post-Harounian and pre-Ouljian, corresponding to the first part of the Alpine Wuermian. The Soltanian, previously correlated with the Mediterranean Grimaldian, actually belongs to the Grimaldian II and cannot be correlated with the European Wuermian formations.
Considerations sur la chronologie du Quaternaire saharien
Authors: Alimen H.
Published: March 2020

Recent research in the Sahara is assembled and studied for the purpose of correlating the Quaternary deposits of that region with European glacial chronology. For this reason the Sahara sedimentary series and the Pyrenean fluvioglacial phases are compared. Absolute dates obtained from equatorial, north-tropical, and Mediterranean Africa are presented in a chart which includes prehistoric industries and the glacial chronology of France and central Europe. Deposition of the sediments of the last sedimentary cycle in north Africa began approximately 20,000-30,000 yrs. B.P. (Paudorf interstade). Pollen from the Mousterian-Aterian sediments at Hoggar seem to indicate a subhumid to humid climate for the southern Sahara. The same seems to be true in the northwestern Sahara. Radiocarbon dates correlate the European Wuerm III with the Saharan humid phase, and the period of maximum humidity in the Neolithic of the southern Sahara with the renewal of humid conditions in Europe during the Atlantic and Subboreal epochs. The data assembled reveal a similar pluvioglacial period and climatic succession in south-tropical and equatorial Africa. The three tables included illustrate the proposed correlations between the different African regions, France, and central Europe.
Degre d'evolution des sediments neolithiques et post-neolithiques du Touat. Comparaison avec la Saoura
Authors: Conrad Georges
Published: March 2020

Quaternary formations exposed at Bou Ali (western Sahara) are described in conjunction with a discussion of the evolution of the Neolithic deposits at Saoura and Touat. The deposits are primarily alternating beds of swamp paleosols and tuffs separated from the underlying coarse continental sandstone by a conglomerate. Two independent sedimentary cycles are overlain and thus preserved by a sandstone crust. The lower cycle includes poorly consolidated conglomerate, coarse red-stained sandstone, and argillaceous limestone. The upper cycle includes a succession of limestone tufa and swamp paleosols separated by fine sands. A hematized tree trunk, reported from Quaternary deposits near Ait el Messaoud, is proof of the arborescent flora of the recent Quaternary. The presence of hematite in such recent deposits is explained by the epigenesis of iron sulfide. Cross sections and cumulative granulometric curves are included along with tables comparing the compositions of the swamp paleosols and the red-stained horizons.
Les transgressions cretacees sur le massif d'Oroz-Betelu (Navarre espagnole)
Authors: Ciry Raymond , Amiot Maurice , Feuillee Pierre
Published: March 2020

The Oroz-Betelu massif is a large anticline composed of Paleozoic and Triassic rocks, surrounded by Cretaceous and Tertiary strata. Study of the biofacies and lithofacies shows that this structure was an emerged zone during the Cenomanian. It was invaded by the Santonian Lacazines sea and oscillations brought about a partial emergence at the end of the Santonian or at the beginning of the Campanian. This was followed by the deposition of a flysch facies at the end of the Campanian. A marine regime continued throughout the remainder of the upper Cretaceous.
Observations nouvelles sur la region du Cap-d'Ail (Alpes-Maritimes)
Authors: Bourcart Jacques , Damiani Lucien , Vernet J. , Le Calvez Yolande
Published: March 2020

Recent drilling in the eastern part of the Cap d'Ail region and in neighboring Monaco has furnished information on the strata underlying the Quaternary cover. Local unconformities appear to exist in the Pliocene-Miocene section and thrusting has resulted in complex relationships. Jurassic rocks have been thrust over Cretaceous, which in turn, are overthrust on lower Miocene volcanic tuffs.
Lithologie des calcaires a Hippurites au plateau du Camp (Var)
Authors: Blanc Jean J.
Published: March 2020

Upper Angoumian (upper Turonian: upper Cretaceous) sedimentation in the Camp plateau area of the Beausset basin of southern France occurred in an area of exclusively calcareous deposition, as contrasted with the terrigenous deltaic sedimentation in the La Ciotat and Soubeyran areas; but two antagonistic types of deposition occurred concurrently in the area. Colonies of Hippurites and other bioconstructive organisms developed limestone lentils, and waves and currents eroded the limestone masses into biodetrital calcarenite deposits in which no trace of bioherm structure is seen.
Sphenopteris durbanensis nov. sp., nouvelle Sphenopteridee du Stephanien moyen de Durban-Corbieres (Aude)
Authors: Corsin P. , Vila Jean Marie
Published: March 2020

A new species described from the middle Stephanian in southwest France is excellently preserved. Its characteristics can be compared to Sphenopteris lenis Zeiller and to Sphenopteris matheti Zeiller from the middle Stephanian of the Loire.
Contribution a l'etude du Bedoulien entre la Bedoule et Cassis (Bouches-du-Rhone)
Authors: Humbert Simone
Published: March 2020

Stratigraphic study of the Bedoulian (Aptian, Cretaceous) units southeast of Marseilles (France) on the southern slope of the Saint-Cyr-Carpiagne chain reveals rapid lateral variation of facies between Cassis and Bedoule. The five formations previously described from the area are revised on the basis of more detailed information. The first formation, a calcarenite with rudistids and gastropods, is uniform between the two localities and represents the Urgonian-Bedoulian transition. The second and third formations, beige or gray limestones, sometimes marly, with abundant ammonites--Deshayesites, Parahoplites--vary considerably in thickness. The marly limestones of the fourth formation remain relatively uniform, while the fifth formation disappears west of Saint-Jean. The fauna collected from these units is the classic Bedoulian assemblage. The maximum thickness of the Bedoulian occurs at Comte indicating major subsidence during that time. The Bedoulian aureole is affected by two series of fractures, one perpendicular to the direction of the bedding and the other parallel to it.