bluuebunny/crossref_metadata_2025 huggingface dataset:
Le genre Amphiblestrella; nouveau genre de bryozoaires cheilostomes
Authors: Prud'homme Janine
Published: June 2020

Four species described from the upper Cretaceous and Eocene of Europe and the United States are redescribed and regrouped into the new genus Amphiblestrella of the bryozoan family Calloporidae.
Considerations biostratigraphiques sur les ostracodes des couches alternantes de l'Eocene moyen et superieur au sud de Bordeaux
Authors: Ducasse Odette , Vigneaux M.
Published: June 2020

Variations in associations of ostracods in middle and upper Eocene deposits of the Talence borehole, south of Bordeaux, France, are discussed in terms of facies changes. The data are used for defining the stratigraphy of the section and for interpreting paleoecologic conditions.
Donnees nouvelles sur la stratigraphie du Grand-Cabri et du Cengle (Bouches-du-Rhone)
Authors: Corroy Georges , Touraine F.
Published: June 2020

The Grand-Cabri hill in Bouches-du-Rhone, France, is not composed entirely of the Saint-Marc limestone (Thanetian), as has generally been accepted. Although the western part, downdropped by the Bimont-Saurine fault, is formed by this Eocene lacustrine limestone, the whole cap of the eastern part of the hill corresponds to the subhorizontal Meyreuil bank (Montian), which is equivalent to the Beaurecueil lens in the Montian marls of the Cengle hill. From this it follows that the main bank forming the cuesta of the Cengle, as well as the overlying birds' egg-bearing marls, is the equivalent of the Saint-Marc limestone. The very top of the Cengle is composed of Sparnacian and possibly also basal lower Lutetian deposits.
Problemes de la geologie de l'Antecambrien en Ahaggar (Sahara central)
Authors: Lelubre Maurice
Published: June 2020

Unconformities that can be traced for distances of many kilometers permit identification of chronologic units and interpretation of the geologic history of the Precambrian in the Ahaggar mountains of the central Sahara (Algeria). The Pharusian is represented by sedimentary and volcanic material filling huge tectonic troughs between asymmetric Suggarian blocks. The Suggarian and Pharusian correspond to two major orogenic cycles, in each of which general metamorphism preceded the major phases of folding. Migmatization developed toward the close of the folding phases, and progressed toward formation of increasingly more discordant granites and even toward rhyolitic volcanism. The structure as a whole is dominated by huge fractures dating from the end of the Suggarian cycle, which were subsequently rejuvenated and later controlled the deposition and evolution of the sedimentary cover.
Sur deux petits massifs suggariens presentant certains caracteres du facies In Ouzzal
Authors: Reboul Claude
Published: June 2020

Two small Suggarian (Precambrian) massifs, one in the northern Ahaggar mountains, Algeria, southwest of the Tihodaiene Erg and the other in the extreme southern part of the range east of Tin Zaouatene, exhibit similar characteristics. Both occur within Pharusian (Precambrian) basins, and the rocks are characterized by a facies resembling that of rocks of the distant In Ouzzal horst. Analysis of the mechanism responsible for development of this facies may throw light on the genesis of the rocks and on charnockitic facies in general.
La vie et l'oeuvre de Louis Gentil (1868-1925)
Authors: Bourcart Jacques
Published: June 2020

A biographic account of Louis Gentil, who contributed extensively to knowledge of the physical geography and geology of north Africa. A bibliography of more than five pages lists his publications.
Les madreporaires du Pliocene d'Orosei (Nuoro, Sardaigne)
Authors: Chevalier Jean Pierre
Published: June 2020

Describes madrepores (including Caryophyllia charrieri n.sp. and Dendrophyllia oroseiensis n.sp.) from Pliocene marls of the Orosei area, on the east coast of Sardinia, Italy.
Nouvelles donnees sur les diabases-porphyrites de la region de Sangineto (Calabre)
Authors: Bousquet Jean Claude
Published: June 2020

The northernmost outcrop of the diabase-porphyrite complex of Calabria, Italy, is in the Sangineto zone, long recognized as exceptionally complex. Results of studies are reported whose particular purpose was to define the upper and lower boundaries of the series of diabases and porphyrites, to describe the interrelationships of the varieties within the series, and to ascertain the relationships of these rocks to the nonvolcanic country rocks. Pillow lava structures recognized in many places suggest that the volcanic rocks are ancient submarine lava flows. Overlying limestones contain layers of breccia in which Tithinian (Jurassic) fragments have been identified, thus refuting the Triassic age previously assigned to them in the literature.
Etude granulometrique et mineralogique de douze echantillons de boue du fond du lac Majeur (Haute Italie)
Authors: Parea Gian Clemente , Wezel F. C.
Published: June 2020

Twelve samples of muds were collected from the bottom of Maggiore lake (northern Italy), at approximately equal intervals throughout the length of the lake in order to index the grain-size distribution and mineral composition of the muds. Most of the samples are typically lacustrine; some are typically fluviatile. The data indicate the presence of a significant amount of mineral matter in suspension throughout the lake as a result of strong currents generated by winds and by thermal variations in the lake waters.
Contribution a l'etude des Homanolotidae (Trilobites) des Gres a Dalmanella monnieri (Siegenien inferieur) du Massif armoricain
Authors: Pillet Jean
Published: June 2020

The Dalmanella monnieri sandstone of lower Siegenian (lower Devonian) age in the Armorican massif of northwestern France contains large numbers of a large Homanolotidae trilobite of an undescribed species. Several good specimens were obtained, although it is exceptional to encounter identifiable specimens. This species, previously overlooked or perhaps assigned to other species, is Burmeisteria (Digonus) armoricanus n. sp.
Echinides eocenes de la region d'Eskisehir (Anatolie occidentale)
Authors: Roman Jean
Published: June 2020

Seven species belonging to the genera Echinolampas, Conoclypeus, Ditremaster, Lutetiaster, and Macropneustes from the Eskisehir area of northwestern Anatolia, Turkey, indicate Lutetian (middle Eocene) age of these strata. E. dilatatus Ag. is considered equivalent to E. affinis (auctorum, non Goldfuss).
Note preliminaire sur la tectonique de la region de Castril (province de Grenade, Espagne)
Authors: Foucault Alain
Published: June 2020

The valley of the Castril river NE of Granada (southeastern Spain) exposes intensely folded and faulted formations otherwise concealed by Quaternary detrital deposits. An erosion surface slopes from an elevation of 1,100 m on the north to 950 m on the south. Conglomerates of early Quaternary (?) age lie upon the erosion surface, and to the north rises an escarpment of Cretaceous limestone. NE-trending thrust faults cut the area and large masses of Triassic gypsum occupy the thrust faults.
Quelques directions de courants dans le Buntsandstein de la Sarre et de la Lorraine septentrionale
Authors: Perriaux Jacques , Mueller Erwin M.
Published: June 2020

Study of the oblique and intersecting stratification planes of the lower Triassic Buntsandstein sandstone of the Saar and northern Lorraine region shows provenance was from south and west. Major current direction was W-E, but the SW-NE direction was important.
Propos sur les geosynclinaux
Authors: Aubouin Jean
Published: June 2020

Geosynclinal theory began with the characteristics found in the geosynclinal chains of the Alpine cycle in Europe, then, after much research, was modified to include Prealpine chains, the Hercynian (Variscan), Caledonian, and Precambrian. The fundamental organization is found to be the eugeosynclinal-miogeosynclinal couple. These couples are repeated in two types of symmetry, centrifugal and centripetal, in the manner of centrifugally-symmetrical bicouples. The classic chain's double character, with the median zone either an intermediate massif of the Zwischenberg type, an intermediate trough, or eugeanticlinal and eugeosynclinal folds, influences the orogenic, magmatic and metamorphic gradients toward the exterior. The eugeosynclinal-miogeosynclinal couple itself is defined by the paleogeography, the polarity, and the tectonic structures. Geosynclinal, tardigeosynclinal, and postgeosynclinal periods are recognized, but seem to be of lesser importance with greater age of the geosynclinal development.
Sur le Callovien moyen, l'Oxfordien et la base de l'Argovien entre Saint-Didier et Saint-Priest (Ardeche)
Authors: Yazdi Rouhollah
Published: June 2020

Results of a stratigraphical and paleontological study of the area between Saint Didier and Saint Priest (France) agree with recent data published on the stratigraphy of the area. Although it is agreed that the upper Callovian is missing, that the Oxfordian is also missing is rejected. Beds containing the characteristic Oxfordian Spinigera protea, Balanocrinus colloti, and B. subteres were encountered between Callovian and Argovian beds, and are therefore correlated with the Vesseaux microfacies.
Quelques graptolites du Silurien superieur du Sahara septentrional
Authors: Willefert Solange
Published: June 2020

A detailed study of graptolites from two oil wells south of Laghouat, Algeria, permits a precise subdivision of the upper Silurian from the upper Wenlock to the upper Ludlovian. The upper Wenlockian is characterized by Sardinian forms unknown in northern Europe. The eight species described from this age are similar to Moroccan and Bohemian faunas and indicate that during that time the connection with the northern European seas, although slight, had not yet been cut. In the lower Ludlovian the communication between the seas was normal as indicated by the similarities with the faunas of America, northern Europe, and the USSR. Eight species are described which have been recognized previously in Bohemia, Great Britain, and America. The middle Ludlovian fauna is sparse but recognizable as a Bohemian fauna. Three species and a new variety--Monograptus aequabilis n. var.--are described. The upper Ludlovian fauna is correlative with zone egamma of central Europe. Five species are described, including Monograptus sp. (sub-hercynicus n. sp.?).
Le Bartonien de Ronquerolles (Seine-et-Oise)
Authors: Cavelier Claude , Pomerol Charles
Published: June 2020

Sedimentologic, petrologic, and paleontologic studies of two quarries and two cores in eastern Vexin (northern France) have provided detailed information on the Bartonian beds of the Ronquerolles hill. The formations encountered are distinguished by their fauna, granulometry, and heavy mineral content. Although the base of the Bartonian is not exposed, three Bartonian substages are proposed. The Auversian substage (Zone I), the lowest of the three, includes the Auvers and Beauchamp sands and sandstones. The Marinesian substage (Zone II) is represented by a sand facies equivalent to the Ezanville beds, the undifferentiated Ducy-Mortefontaine-Saint Ouen facies, the Cresnes sands and the Marines sands with Corbula costata. The upper substage, Ludian (Zone III), includes the Pholadomya ludensis marls and the Ludian marl facies. Paleogeographically, the Ronquerolles series is similar to deposits north of Vexin. South of Thelles the Bartonian facies are isopic in an east-west direction and heteropic in a north-south direction. This polarity of the Bartonian facies with respect to the east-west direction implies bathymetric variations as well as a detrital faunistic shift in provenance of the emerging country to the north during the Auversian. During the Marinesian a marine channel oriented in an east-west direction dominated the area on the same latitude as northern Vexin.
Louis Barrabe (1895-1961)
Authors: Bellair Pierre
Published: June 2020

An account of the life and work of the French geologist Louis Barrabe with a list of his publications.
Presence de l'Halitherium dans l'Oligocene du Poitou
Authors: Patte Etienne
Published: June 2020

A reworked skull fragment of Halitherium sp. found in ancient alluvial deposits of an abandoned channel of the Clain river in Poitou, France, may represent a variation or mutation of H. schinzi. Its Oligocene age confirms the presence of Oligocene deposits in the region. The Tertiary so-called lacustrine deposits of the region have generally been assigned a variety of ages ranging from Lutetian (Eocene) to Aquitanian (Oligo-Miocene).
Le Nigritien de l'Adrar Tira'rar (Adrar des Iforas, Sahara)
Authors: Karpoff Roman
Published: June 2020

An essentially complete section of the Nigritian is represented in western Adrar Tira'rar, located in the west-central part of the Adrar des Iforas, a mountainous complex of the Sahara region forming an extension of the Ahaggar mountains (Algeria-Sudan border region). The stratigraphic relationships of the various constituents of the formation (conglomerates, rhyolites, arkoses, and quartzites) vary in different localities, suggesting deposition in a tectonically unstable environment that obtained during a closing phase (or phases) of the Precambrian proper. A Nigritian granite has been discovered, thus proving that not all isolated red granite masses in the Precambrian basement of the Sahara are Pharusian.
Une association biologique (symbiose) entre un bryozoaire et un pagure dans le Quaternaire du Rio de Oro (Sahara espagnol)
Authors: Buge Emile , Lecointre G.
Published: June 2020

Remains of fossils resembling a thick- shelled gastropod from Quaternary deposits of Rio de Oro (Spanish Sahara) are identified as a membranipore bryozoan zoarial structure in symbiotic association with a crab. A similar association is known for cellopore bryozoans but this is the first record for a membranipore.
Serie stratigraphique du Cozzo Cavolino (Madonies orientales, Sicile)
Authors: Broquet Paul
Published: June 2020

The Panormide limestone and dolomite series of the Madonies massif near Cozzo Cavolino (Sicily) consists of upper Jurassic gray to white, crystalline dolomites transgressively overlain by a thin scaglia of marls and schistose marly limestone. The transgressive bed is covered by a discontinuous conglomerate of limestone, gravel and dolomitic pseudo-oolitics. An Oligocene to Miocene flysch covers the conglomerate beds.
Une reconnaissance geologique de la peninsule Courbet, archipel de Kerguelen
Authors: Aubert de la Rue Edgar
Published: June 2020

Volcanic beds on the Courbet peninsula of the Kerguelen archipelago in the Indian Ocean, are described, placed in stratigraphic order and compared with the beds of the rest of the archipelago. In the western mountainous area between lakes Studer and Margot, there can be seen a massif of modified spilitic lava, 5 km across and bordered on three sides by faults. The greater part of the peninsula is composed of a series of basalt flows of various textures and composition. Detrital features are widespread, especially on the western plains. Moraines, outwash deposits, drumlins, and sand dunes are common. The Kerguelen archipelago was once a large land mass composed of Miocene and lower Pliocene volcanics. The present day islands are the result of severe faulting and subsequent sinking of parts of the area.
Essai d'interpretation du mecanisme des courants de turbidite
Authors: Nesteroff Wladimir D.
Published: June 2020

When the mechanism of turbidity currents was first proposed, it was thought that ooze deposits, which alternated with coarse to fine sand, were deposited on abyssal plains by pelagic sedimentation between turbidity current pulses. Later it was thought that concentrations of calcareous bioclastic material in the upper part of the ooze pointed to turbidity current deposition of the sand and lower part of the ooze, with only the upper ooze a result of pelagic sedimentation. Because CaCO 3 tests dissolve in sinking, no calcareous tests of upper ocean origin are found below 5500 to 5600 m. However, a study of terrigenous turbidites from abyssal plain samples taken at depths exceeding 5900 m which follow the sand to ooze sequence with foraminiferal concentrations in the upper ooze demonstrate that the beds are turbidite alone. It is hypothesized that any pelagic deposits forming between turbidity currents would be eroded away at the beginning of each pulse and that the fossil concentrations in the upper ooze result from delayed settling of the gas or protoplasm filled tests.
Quelques problemes geologiques abordes par la seismologie
Authors: Allegre Claude , Mechler P. , Rocard Y.
Published: June 2020

The characteristics of a proposed portable seismograph are described. Interpretation of facts obtained by the apparatus correspond with observations of surface geology. The emission and reception of microseisms is affected by the petrography of the rocks beneath the seismograph and by local structure. Examples of the use of orientation diagrams in structural studies are given from the Armorican massif and from Provence (France).
De quelques particularites de la chaine alpine d'Hidaka au Japon
Authors: Raguin E.
Published: June 2020

The Hidaka alpine range is characterized by metamorphism in the andalusite-sillimanite-cordierite facies and is located at the southern end of the SSE-NNW-trending tectonic arc of Hokkaido. The axial zone of the Hidaka range is composed of migmatites which formed at the expense of metamorphic rocks in the surrounding series of Mesozoic age. Gabbros, some of which contain peridotite, outcrop in a longitudinal zone paralleling the structural trend. The concomitant relationship between these two series is suggested by the occurrence of gabbros in or on the borders of the migmatite domes and by the causal relationship between the basic intrusions and the migmatizations.
Presence du genre Aristozoe Barrande (Crustacea, Phyllocarida) dans les schistes a nodules du Devonien inferieur (Emsien inf.) du Tizi n-Tafilalt (Anti-Atlas oriental, Maroc)
Authors: Babin Claude , Hollard Henri
Published: June 2020

A specimen belonging to the genus Aristozoe Barrande has been collected in the Mersakhsa bed, here assigned to the lower Emsian. This is the first report of this phyllocarid in the lower Devonian of Africa. The exceptional state of preservation of the specimen has permitted observation of the first attached abdominal somites and description of the structural framework and ornamentation of the test, previously unknown in this genus.
Une faune de mammiferes dans l'Helvetien marin de Sos (Lot-et-Garonne) et de Rimbez (Landes)
Authors: Ginsburg Leonard
Published: June 2020

The mammalian fauna described from the Miocene cliffs along the Lectoure gulf (France) includes over 20 species and one new subspecies. The fauna is comparable to that from the Blesois, Touraine, and Anjou cliffs and confirms the lower Helvetian age assigned to the cliffs of the northern shore of the Gulf of Gascony on the basis of marine invertebrates.
Nouvelle espece de Dadoxylon a tracheides septees provenant du Wealdien de Feron-Glageon (Nord)
Authors: Lemoigne Yves , Demarcq G.
Published: June 2020

Anatomical study of a sample of silicified wood collected from a fluviolacustrine sand of Wealden age at the classic locality of Feron-Glageon has yielded a new species described as Dadoxylon arduennense. This species, with abundant transverse parenchyma, raises the problem of the affinities of wood with septate tracheids known from the Jurassic and Cretaceous. It is suggested that this wood may have affinity for the group of angiosperm precursors to which belong the Caytoniales, also represented (by leaf imprints and reproductive structures) in the Feron-Glageon Wealden locality.
Les collines jurassiques de Nans au N du massif de la Sainte-Baume (Var)
Authors: Barbaroux Lucien
Published: June 2020

The Nans-les-Pins hills comprise two structural units. The autochthonous unit corresponds to the Pins plateau and is composed of upper Jurassic and lower Cretaceous formations. The allochthonous unit--the Jurassic outlier south of Nans-is thrust over the autochthonous unit. The development of the structures began in the Cretaceous with folding along east-west axes, followed by shearing, overthrusting, and reactivation of northwest-southeast-trending structural components in the Eocene and Oligocene. The main thrusting phase was probably initiated in the Pontian (Miocene).
Contribution a l'etude petrographique de la montagne d'Arree
Authors: Lucas Gabriel , Collomb Pierre , Beaudou Alain
Published: June 2020

Arree mountains, France, petrography, epizonal-mesozonal regional metamorphism, later contact metamorphism, Infracambrian, Ordovician, Devonian
Contribution a l'etude des roches eruptives de l'ile d'Ibiza (Baleares)
Authors: Beauseigneur Claudine , Rangheard Y.
Published: June 2020

Volcanic rocks, petrology, pyroxene-bearing andesites, camptonites, ophites
Donnees nouvelles sur l'Eocene superieur, l'Oligocene et le Miocene inferieur de la zone separant le Subbetique du Betique de Malaga, au N de la Sierra de Espuna (Cordilleres betiques, Espagne)
Authors: Magne J. , Paquet J.
Published: June 2020

Tertiary stratigraphy, continuous sedimentation during Auversian-lower Miocene time, foraminifera, algae
Essai de correlation stratigraphique entre les marnes a Xanthopsis de la Chalosse, les couches a Nummulites atacicus des Corbieres septentrionales et du Mont-Cayla et le Lutetien du bassin de Paris
Authors: Boulanger Dominique , Massieux Michele , Plaziat Jean-Claude , Toumarkine Monique
Published: June 2020

Underlying Cuisian beds, assignment of middle Ilerdian to upper Paleocene, faunal lists, stratigraphic relations, Eocene, lower Lutetian, France
La serie triasique et infraliasique de Mialet (Gard)
Authors: Cheylan Gilbert , Magne Jean
Published: June 2020

Muschelkalk to Hettangian, lower Hettangian boundary, lithology, fauna, France
Precisions lithologiques et stratigraphiques sur le 'Numidien' de Kroumirie (Tunisie septentrionale)
Authors: Glacon Georgette , Rouvier Henri
Published: June 2020

Lithologic units, middle Oligocene-lower Miocene foraminiferal fauna, lower Miocene or later displacement, subsequent folding
Coupes de deux sondages fores dans la region de Gardanne (Bouches-du-Rhone)
Authors: Dufaure Philippe , Leguillette Jean , Vetter Pierre
Published: June 2020

Cretaceous time-stratigraphic units, faunal lists, post-Hauterivian pre-Santonian bauxite, France
La tectonique recente du bassin de Marseille dans le cadre de l'evolution postmiocene du littoral mediterraneen francais
Authors: Bonifay Eugene
Published: June 2020

Plio-Pleistocene epeirogeny and tectonism, tectonic zones, structural features, terrace levels
Structure de la region centrale de Roque-Forcade (massif de la Sainte-Baume, Var)
Authors: Caron Jean Paul H. , Guieu Gerard , Tempier Claude
Published: June 2020

Overturned shingle blocks of Jurassic formations, Begudian (Cretaceous) conglomerate, Cretaceous deformation, France
Le massif de Saint-Clement; consequences de sa mise en place sur le Trias du Gapeau et de Gareoult ainsi que sur les massifs environnants
Authors: Cornet Cecile
Published: June 2020

Thrusting, compression, warping, lower Tertiary deformation, France
La dorsale Betique, nouvel element paleogeographique et structural des cordilleres Betiques, au bord sud de la Sierra Arana (prov. de Grenade, Espagne)
Authors: Durand Delga Michel , Foucault Alain
Published: June 2020

Northward plunging thrust sheets, overturned series
Les lacs du Burdigalien superieur de l'ile de Majorque (Baleares) et le role des melosires (diatomees) dans la formation de leurs varves
Authors: Colom Guillermo
Published: June 2020

Eutrophic and oligotrophic lakes, regional depositional patterns, lithology, calcified Melosira chains, Miocene hydrography, Spain
Complement d'etude sur Oioceros atropatenes (Rod. et Weith.), antilope du Pontien de Maragha (Iran)
Authors: Heintz Emile
Published: June 2020

Oioceros atropatenes Rodler and Weithofer 1890 and Oioceros boulei de Mecquenem 1924, from the Pontian (upper Miocene) of Iran, are identical. A detailed description is given, with particular emphasis on the upper premolars.
Niveaux fossiliferes dans le calcaire de Champigny pres de Melun (Seine-et-Marne)
Authors: Soyer Robert
Published: June 2020

Fossiliferous horizons are rare in the Ludian (upper Eocene) Champigny limestone of the Paris basin, and have been known only near the outer limits of the outcrop area. A new occurrence near Melun in the central part of the region, southeast of Paris, includes traces and imprints of fluvio-lacustrine molluscs at several horizons encountered in exploratory boreholes. Silicification of the limestone in this area precludes removal of the fossil materials. A new species, Planorbis cf. discus, not only is of large size, but is new for the Paris region.
L'interpretation de l'arc des Alpes occidentales
Authors: Goguel J.
Published: June 2020

The Alpine chain extends 700 kilometers from Vienna westward to Leman, then in a 350 kilometers arc the direction changes to the Maritime Alps in southeastern France. Rocks in the zone between Vienna and the French frontier are intensely deformed, but the zone disappears in France. The deformation seems not to be inherent in the zone itself but to have resulted from outside tectonic forces. Northward displacement of the eastern and central Alps, pushing the sedimentary cover in front of them, appears to be the cause of the deformation of the zone east of the French frontier. A northward displacement of the Provencal tectonic block is proposed as the cause of the observed deformation pattern.
Un graptolite remarquable de l'Ordovicien inferieur du Sahara algerien, Choristograptus louhai nov. gen., nov. sp
Authors: Legrand Philippe
Published: June 2020

Choristograptus louhai n. gen., n. sp. from the lower Ordovician argillites of the El Louha 1 borehole west of Ghardaa in the Algerian Sahara is remarkable for the structure of its rhabdosomes. The species is referred provisionally to the family Anisograptidae. The genus and the species constitute an important passage from Dendrograptidae to Dichograptidae, and indicate that the development of Didymograptus involves complexities previously not suspected.
Du volcanisme en Afghanistan central
Authors: Lapparent Albert F. de , Bordet Pierre
Published: June 2020

Five periods of volcanic activity can be recognized in the mountains of central Afghanistan: Precambrian, post-Triassic, lower Cretaceous, Oligo-Miocene, and early Recent. The material of all the phases is principally acidic, including rhyolites, dacites, and andesites with no true basalts.
Observations sur quelques microfacies du Lias du sud de l'Auxois
Authors: Lorenz Jacqueline
Published: June 2020

Six Liassic microfacies are briefly described from the eastern border of the Morvan mountains (France). The Rhaetian, consisting of black shaly marls with Avicula contorta (pelecypod), is a uniform microfacies of sub- and equigranular quartz grains. Interbedded marls and thin fossiliferous limestone beds (Bourgogne marble) comprise the Hettangian. This microfacies is often sandy, sometimes conglomeratic with rounded quartz pebbles. The Sinemurian is represented by the classic Gryphaea limestone. Its microfacies is also uniform and is composed of organic-detrital limestone with cryptocrystalline calcite cement. Three principal zones are recognized in the Pliensbachian stage. At the base interbedded marls and marly limestones with a rich macrofauna comprise the Carixian substage. A marly series corresponding to the lower middle Domerian overlies the Carixian. The upper Domerian substage is composed of three or four limestone beds, characteristically violet, which alternate with marl. The Toarcian consists of paper shale and marls overlain by a limestone bed containing Hildoceras bifrons (mollusk) (middle Toarcian). The Toarcian microfacies is a finely crystalline limestone with minute bone and plant fragments. The Toarcian-Aalenian contact is gradational. At the top of the Aalenian, psammitic intervals are interbedded with marls. The gray nodular limestones of the microfacies become increasingly rich in crinoid fragments from the base to the top, indicating an upper Aalenian age for the microfacies.
Contribution a l'etude stratigraphique et paleontologique du synclinal d'Ancenis (Massif armoricain)
Authors: Cavet Pierre , Pillet Jean
Published: June 2020

The schists and quartzites which form the northern and southern flanks of the Ancenis syncline on the right bank of the Loire river (France), have yielded sandy, micaceous nodules which contain a middle Ordovician trilobite fauna. This discovery indicates a similarity between the quartzites and the Calymenella bayani sandstone of the more northern folds of the Saint-Georges-sur-Loire synclinorium; but the volcanic schists which overlie the C. bayani sandstone are not represented in the Ancenis syncline. Contrary to what has been thought until now, the schists and quartzites rest unconformably on the Brioverian basement complex. The Brulis limestones, present as lenses interbedded in the schist-quartzite band on the south flank, are considered middle or upper Ordovician. The Ecochere jasper and calcareous schist with limestone lenses are directly transgressive on the middle Ordovician and contain a fauna typical of the Frasnian (upper Devonian). The Frasnian Cope-Choux limestone with Hypothiridina cuboides of the north flank seems to be directly related to fissile shales identical to those containing the Ecochere limestones. Continental deposits of the lower Culm, which contain Rhodea hochstetteri, occupy the core of the syncline and are principally Dinantian, but may extend into the lower Namurian. The absence of upper Namurian and Westphalian deposits suggests the intervention of a new orogenic phase (Erzgebirgian?). The Llandeilian trilobites Placoparia zippei, Colpocoryphe aragoi, and Pricyclopyge binodosa are described from the nodules. Pricyclopyge binodosa is the first representative of the Cyclopygidae reported from the Armorican massif.
Application du 'tamisage virtuel' aux calcaires detritiques de la region de Nantua (Ain)
Authors: Lang Jacques
Published: June 2020

Interpretation of simple and cumulative curves constructed from granulometric analyses of thin sections of Bajocian-Barremian detrital limestones from Nantua (France) makes it possible to determine the sedimentological and oceanographic conditions of the deposition. The presence in the Bajocian limestones of Cancellophycus which lives at 200-1000 m depths points out the contrast between the deep-water facies and the coastal facies, represented by crinoidal limestones with Echinus and foraminifera. The Bajocian transgression, gradual at first, with horizontal facies variation, increased in the upper Bajocian with deposition of a fine limestone ooze. The Bathonian transgression attained its maximum in the upper Bathonian with deposition of argillaceous limestones in unfossiliferous beds. The Callovian nacreous flagstone is overlain by material reworked by strong, sometimes turbulent currents. The reduced thickness of Oxfordian deposits represents the transition between the organic sediments of the Dogger and the upper Jurassic oozes. The upper Jurassic transgression, most pronounced in the Argovian (Lusitanian), began to recede in the Portlandian depositing reworked oolitic limestones. A pisolitic layer marks the base of the Sequanian. The fine lacustrine limestones of the Purbeckian are followed by transgressive lower Cretaceous deposits.
Etude de la microfaune du Viseen et du Moscovien de differents bassins sahariens (Tindouf, Taoudeni, Colomb-Bechar, Reggane, Polignac, Fezzan ouest)
Authors: Chanton Nicole
Published: June 2020

Study of marine deposits from Carboniferous basins in the Sahara makes it possible to compare their Visean and Moscovian microfaunas and to outline the paleoecology of the Saharan foraminifera of that age. Four microfacies are distinguished in the limestones of the different basins: fine limestones; limestones with crinoids and brachiopods; limestones with isolated crinoids and brachiopod debris; and oolitic limestones. The families represented are discussed according to their distribution in the facies and in the substages of the different basins. The families represented include Ammodiscidae, Endothyridae, Textulariidae, Trochamminidae, Archaediscidae, Ophtalmidiidae, and Fusulinidae. The Visean is characterized by rare Endothyra, abundant Plectogyra, primitive forms of Fusulinidae, and Tuberitina (Incertae Cedis). In the Moscovian, species of Bradyina described from Russia were recognized along with advanced forms of Fusulinidae.
Remarques au sujet des temperatures wurmiennes
Authors: Leroi-Gourhan Arlette
Published: June 2020

A brief review of maximum cold temperatures in the Wuermian as determined by physicists, botanists, zoologists, geologists, etc., shows that the temperatures estimated by each group are generally comparable. A table is included showing the differences between Recent and Wuermian maximum lows at various geographic localities and at high and low altitudes.
Le Quaternaire du bassin superieur de la Loire, des bassins moyen et superieur de l'Allier et de leurs marges
Authors: Bout Pierre
Published: June 2020

Pleistocene tectonic activity, volcanism, glaciation, fluvial terraces, and periglacial phenomena of the upper Loire basin and the middle and upper Allier basins (France) are discussed. Subsidence, uplift, hydrographic modifications, and restriction of the basins are all the result of Villafranchian tectonism. Volcanic deposits from eruptions involving Velay, eastern Cantal, Cezallier, Mont-Dore, Limagne, Clermont-Ferrand, and the Puys chain are described. Both the tectonic and volcanic activities contributed to the uplift of Velay, Margeride and other parts of the Central Massif, causing them to be glaciated and subjected to periglacial forces. In the region studied, only the higher altitudes show evidence of glaciation attributed to the Wuerm. Traces of older glaciation are rare or dubious. The difficulties involved in interpreting the fluvial terraces are discussed. The relative ages of the terraces can be determined by the effects of the tectonic activity which twice disrupted their deposition. Periglacial deposits in the area are the result of the phenomena of cryoturbation and eolian forces. The Central Massif seems to have been an anticyclonic area, dispensing violent winds which would explain the noticeable effects of eolian forces and the absence of loess deposits.
Note preliminaire sur l'etude des limons quaternaires du Bergeracois (Dordogne)
Authors: Guichard Jean
Published: June 2020

The preliminary findings of an archaeological investigation of three cuts in the Bergerac area (southwestern France) are given. The Cantalouette cut includes a series of thick sandy loam, coarse sand, and the Perigord sandy clay--a sequence probably contemporaneous with the beginning of the Wuerm. Deposits at the Pendus locality resemble the Cantalouette sequence and possibly represent the final episode of the Riss. The Toutifaut cut differs from the two preceding localities, consisting of a sequence of red sand and concretionary gravels which probably represent most of the Wuerm. Cross sections are included.
Frequence et extension des glaciations a l'extremite sud-ouest des Vosges meridionales (region de Luxeuil-les-Bains)
Authors: Theobald Nicolas
Published: June 2020

Two series of glacial and fluvioglacial deposits can be distinguished east and northeast of Luxeuil-les-Bains (France). Deposits of the older glaciation are found on the plateaus and probably represent the Rissian. The deposits are characterized by fluvioglacial material and erratics of basic green crystalline rocks, light colored acidic rocks, and conglomerates. The younger glaciation, probably Wuermian, is represented in the valleys by moraines and terrace deposits.
Sur les 'alluvions jaunes' de la region lyonnaise
Authors: Brun Annik
Published: June 2020

Mineralogic and granulometric study of pebbles from the yellow alluvium in the Montuel region (Ain, France) shows that the two superimposed complexes recognized by F. Bourdier (1963) in the alluvium are nonexistent. The alluvium is a distal fluvioglacial deposit and is homogeneous throughout. Approximately 30% of the pebbles in all the samples studied show extreme wear. This is explained by the fact that rivers issuing from glaciers contain a higher percentage of suspended material, thus increasing the erosive power of the water and producing pebbles more eroded than those from rivers of other origins. The pebbles are of uniform size throughout the deposit--50 percent between 20 and 30 mm--and the heavy minerals are consistently epidote, garnet, and amphibole.
Les niveaux quaternaires marins des Alpes-Maritimes. Correlations avec les industries prehistoriques
Authors: Lumley Henri de
Published: June 2020

Deposits along the Maritime Alpine coast of France and Monaco reveal six shorelines between the greatest extent of the Plaisancian transgression and present sea level. During the transgression at the end of the Pliocene, the sea was 165 meters above its present position. The post-Pliocene regression marks the Tertiary-Quaternary boundary. During the eustatic Calabrian transgression, the sea reached a maximum altitude of 108 meters. During the transgression in early Pleistocene time the sea reached an altitude of 83 meters. The extensive early Pleistocene regression resulted in the formation of the caves in the Nice-Grimaldi area. The sea reached a height of only 30 meters during the second early Pleistocene transgression. The Mindel-Riss transgression is represented by littoral deposits as high as 23 meters in Monaco. A warm water molluscan fauna from littoral deposits marks the Tyrrhenian Riss-Wuerm transgression which reached a height of 12 meters. Excavations produced remains of mammals, human industries, and cryoclastic deposits.
Observations morphologiques sur les depots quaternaires de la basse vallee du Rio La Ligua (Chili)
Authors: Paskoff Roland
Published: June 2020

Four levels of erosion and continental deposition are observed in the lower valley of the Ligua river. The lowest level, characterized by a plane surface developed in the Ligua-Petorca interfluve and on the right bank of the Ligua, 100 meters above its present level, represents a major glaciation in the early Quaternary, perhaps a semi-arid climate with a tendency toward the tropical Villafranchian(?). Twenty-five to thirty meters above the river is the second level, a high gravel terrace deposited by waters of the retreating glacier. The middle terrace is five to seven meters above the low terrace, which is one or two meters above the present level of the river. Recent and fossil dunes are found where the Ligua approaches the Pacific. Traces of three ancient sea levels are found at 100 meters, 35 meters, and five to seven meters above present sea level. These shorelines correspond to forms recognized in western Europe and northwest Africa, the result of transgressive-regressive pulsations of the sea.
Les structures annulaires des granites des 'taourirts' en Ahaggar occidental (Sahara)
Authors: Boissonnas Jean
Published: June 2020

A swarm of granite massifs outcrops in the Pharusian structural basin of western Ahaggar (Algeria) not far from the major dislocation marking the eastern boundary of the basin, and separating two distinct areas. The granites appear as ring structures; two phenomena caused these features: the emplacement of several successive porphyroid granites, each one having identical composition but varying in grain size, and the formation of thick rings with relatively alkaline and leucocratic borders. Two generations of massifs are apparent and differ in their alkaline marginal facies, in their complexity, and in their geographic situation. The plutons of western Ahaggar and the subvolcanic structures of Nigeria have certain aspects of their structure in common. Nevertheless, the 'taourirts' are older and less evolved than those of Nigeria.
Sur la stratigraphie et la tectonique de l'Eubee moyenne (Grece)
Authors: Aubouin Jean , Guernet Claude
Published: June 2020

The stratigraphic section of Euboea island (Greece) contains Kimmeridgian limestone, a diabase-radiolarite, and a transgressive upper Cretaceous massive limestone. Cenomanian and Maestrichtian beds are recognized with flysch deposits in the Maestrichtian and younger series. The sequence is part of a southwest plunging monocline with two fault systems: a principal NW-SE and a secondary NE-SW system. The first is believed to be pre-Pliocene and the second post-Pliocene. A metamorphic zone in the northeast consists of marbles and sericite schists with some trachyandesitic volcanics.
L'age des schistes lustres de la Corse
Authors: Lapadu-Hargues Pierre , Maisonneuve Jacques
Published: June 2020

Results of extensive paleontologic, stratigraphic, and petrologic investigations of the schistes lustres of Corsica indicate that they are not Mesozoic or Tertiary but much older, possibly Paleozoic. The metamorphism which affected the schistes lustres is pre-Mesozoic as indicated by the fact that Hercynian granites overlie and granitize the schistes lustres. Further support is provided in that the Eocene, Jurassic, Triassic and Permian strata contain pebbles of rock originating from them. The Corsican schistes lustres may be compared with the Chataigneraie schists of Cantal or the Cevennes schists.
Tectonique de l'est du massif de la Sainte-Baume
Authors: Douville Francois , Barbier Reynold
Published: June 2020

Preliminary studies for the construction of the Provence canal revealed a major overthrust placing the Triassic over the Cretaceous in the region east of Sainte-Baume between Glacieres and Mazaugues, France. The area is divided into three structural zones. The northern zone consists of the Mazaugues plateau and its Jurassic substratum with no evidence of significant tectonic activity. The intermediate zone, including the Triassic and the Lias, was subjected to strong structural deformation as illustrated by two anticlines in the Muschelkalk limestones. Between the two anticlines a synclinal fold affects fossiliferous Jurassic marl. The southern zone is the Jurassic aureole at the border of the Beausset basin which consists of a rigid plate of limestone and dolomite formations. Tangential movement in a southeast-northwest direction caused the folding of the plastic beds. As the movement continued the inverse flank was sheared and the normal flank overrode the Cretaceous of the Mazaugues monocline.
Nouvelles donnees sur la structure de la serie du Buem et sur la stratigraphie de la serie de l'Oti au nord-ouest du Dahomey
Authors: Hout Gilbert , Lelong Francois
Published: June 2020

A study of the nature and relation of the metamorphic and sedimentary beds in northwestern Dahomey, between the Atacora boundary and Oti valley, shows that the Buem series constitutes a folded structure intermediate between the unfolded Kande series on the east and the nearly horizontal beds of the Oti series on the west. The stratigraphic facies described from Togo do not extend to the east into Dahomey. The unconformity between the Buem and Kande series is not in evidence in the area, and the degree of metamorphism and structural relations of the two series do not provide sufficient evidence for resolving the problem of their relative ages. Two hypotheses are proposed, one which supposes the faults to be normal, and the other in which they are reverse.
Le 'Lexique international de petrographie des charbons'; occasion d'un panorama et d'un bilan
Authors: Alpern Boris
Published: June 2020

The nomenclature used by the USA, USSR and Europe for the petrography of coals is summarized and compared on the basis of material taken from the second edition (1963) of the International Lexicon of Petrography of Coals. The lexicon, here described, is divided into two parts--nomenclature and analytic methods. Tables and short descriptions of the different sections are given, including the general terms, Stopes-Heerlen nomenclature, nomenclature of the Institute of Geology of the Moscow Academy of Sciences, the coal minerals, and the methods of petrographic analysis.
Decouverte de la zone a Dictyonema flabelliforme Eichwald dans l'Ordovicien inferieur du Sahara algerien septentrional
Authors: Blain Marie
Published: June 2020

Two cores taken from drill holes SSE of Laghouat, northern Algerian Sahara, yielded a rich graptolite fauna, primarily species of Dictyonema. Study of these fossils resulted in the recognition of the middle and upper parts of the Dictyonema flabelliforme zone in the lower Ordovician. A brief description of the lithostratigraphy of the two cores is given. The following forms are described: Dictyonema flabelliforme cf. flabelliforme, D. flabelliforme aff. anglicum var. 1 (nov.), D. flabelliforme cf. anglicum var. 2, D. flabelliforme aff. bryograptoides, Anisograptus? or Adelograptus? sp., Bryograptus sp. These graptolites establish the existence of the lower Tremadocian gamma I zone in the Sahara.
La tectonique de la Mediterranee moyenne et les seismes
Authors: Aubouin Jean
Published: June 2020

Three superimposed structures can be distinguished in the central Mediterranean Alpine chains: tangential structures--folds and faults--of the geosynclinal period (Cretaceous); compression structures of the late geosynclinal period (Tertiary); and extension structures of the postgeosynclinal period (late Miocene). The Recent and sub-Recent volcanism and seismic shocks in the area are related to the structures of the last period. This seismicity does not represent the continuing formation of the Alpine chain but rather its continuing deformation. The southern part of the Dinarides seems to be a NNE-SSW extension of the vertical and horizontal movements along the local fracture zones.
Sur Conulus subrotundus Mantell du synclinal d'Eygaliers (Drome)
Authors: Letourneur Jean
Published: June 2020

Sea urchins that have been known more than a century in the Eygaliers valley are Conulus subrotundus, characteristic of the Saumurian B (Turonian: upper Cretaceous) in the Touraine region of southwestern France.
Sur le metamorphisme dans la zone pelagonienne orientale (region de l'Olympe, Grece)
Authors: Godfriaux Ivan
Published: June 2020

The Mount Olympus massif of Triassic to Eocene limestone and dolomite surmounted by Eocene flysch, crops out in a fenster in the Pelagonian nappe of undated granite, migmatite, gneiss, augen gneiss, amphibolite, and mica schist overlain by Triassic to Jurassic limestone and shale, Jurassic ophiolite, Cretaceous limestone, and Maestrichtian (upper Cretaceous) flysch. Two episodes of metamorphism are present: an older epizonal to mesozonal one affecting all formations below the Jurassic ophiolite, and followed by migmatization; and a younger metamorphism of Alpine age and mesozonal to catazonal intensity affecting all formations below the Maestrichtian.
Discrimination de deux formes infraspecifiques chez une Rhynchonelle du Bathonien inferieur de Bou-Rached (NE du moyen-Atlas marocain)
Authors: Rousselle Lucienne , Demarez Jean Pierre
Published: June 2020

Statistical study of brachiopods from the lower Bathonian (middle Jurassic) marl-limestone series of the northeastern part of the middle Atlas mountains of Morocco, dated by ammonites, shows that two forms of a species tentatively assigned to Rhynchonella aff.? royeriana oranensis are present. One occurs in a bed exceptionally rich in brachiopods near Douar Maananne. The other occurs in a bed equally rich in brachiopods near Bou Rached. The two beds probably are contemporaneous, and the two forms represent local populations adapted to slightly different local conditions. Final evaluation must await revision of R. royeriana oranensis of the Algerian Bathonian.