bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quelques graptolites du Silurien superieur du Sahara septentrional
Authors: Willefert Solange 
Published: June 2020

Abstract
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

Abstract
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.
Presence de l'Halitherium dans l'Oligocene du Poitou
Authors: Patte Etienne 
Published: June 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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 &lt;sub&gt;3&lt;/sub&gt; 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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).
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

Abstract
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

Abstract
Underlying Cuisian beds, assignment of middle Ilerdian to upper Paleocene, faunal lists, stratigraphic relations, Eocene, lower Lutetian, France
Complement d'etude sur Oioceros atropatenes (Rod. et Weith.), antilope du Pontien de Maragha (Iran)
Authors: Heintz Emile 
Published: June 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.