bluuebunny/crossref_metadata_2025 huggingface dataset:
Contribution a l'etude geologique de l'ile Espiritu Santo (Nouvelles-Hebrides); 1, Roches sedimentaires
Authors: Sagatzky Jean
Published: March 2020

A detailed description of the sedimentary series of Espiritu Santo in the New Hebrides. Three main subdivisions are present, the lowest of which is later than the bulk of the volcanic complex of the island (andesites and labradorite basalts). The sediments are probably all Burdigalian (Miocene) but only the upper unit contains precise paleontologic evidence.
Serie sedimentaire d'Amelie-les-Bains
Authors: Ricour J. , Casteras Marcel
Published: March 2020

Summarizes data on Mesozoic sections in the Amelie-les-Bains basin which were visited during the eastern Pyrenees field excursion of the Societe Geologique de France.
Geologie des formations sedimentaires a l'E de l'Air (Niger)
Authors: Faure Hugues
Published: March 2020

Cretaceous sediments consisting of continental sandstones, with vertebrate remains and silicified wood, overlainby marine fossiliferous Cenomanian-Turonian beds have been preserved in a structural trough cutting deeply into the Aier massif, Niger, west Africa. Part of the present crystalline massifs of the Sahara therefore must have been submerged in the Cretaceous.
Nouvelles observations sur les "gres inferieurs" cambro-ordoviciens du Tassili interne (Nord-Hoggar)
Authors: Borocco Jacques , Nyssen R.
Published: March 2020

The so-called Cambro-Ordovician lower sandstones, a sequence of sedimentary formations between the basement complex and Gotlandian (Silurian) graptolite shales, have been studied in several outcrops in the inner Tassili region, north of the Ahaggar massif, Algeria. Four lithologic units are recognized. The lower two are probably Cambrian. An erosional unconformity separates the third from the uppermost unit. A fauna collected several meters above the unconformity indicates an Ordovician age.
L'Helvetien de Mirabeau (Vaucluse)
Authors: Mongin Denise
Published: March 2020

New stratigraphic and paleontologic data on the Miocene deposits of the Mirabeau area, France, show that the whole series is Helvetian. Cardium turonense is found at the bottom and Chlamys improvisa, C. delphinensis, and C. cavarum in the upper beds. Descriptive notes on the stratigraphic zones and interesting mollusks represented in the fauna are included.
Sur les facies a foraminiferes du Coniacien subrecifal de la region de Foissac (Gard) et sur le nouveau genre Sornayina
Authors: Marie Pierre
Published: March 2020

A new foraminiferal genus, Sornayina, is erected on the basis of material from Coniacian (Cretaceous) deposits of the Foissac region, France, with three new species--S. foissacensis, S. schlumbergeri, and S. munieri. It is ancestral to Spirocyclina. Several facies have been identified within the sequence of upper Cretaceous reef deposits of the region, which are considered to represent conditions favorable for the development of this new genus; similar facies have been identified in Santonian deposits in the vicinity of Martiques, which led to the discovery of numerous specimens of the relatively rare Spirocyclina choffati.
Les recifs carboniferes du Grand Erg occidental
Authors: Pareyn Claude
Published: March 2020

The upper Visean (Carboniferous) reefs of the Grand Erg Occidental (Algeria) in the Sahara region are of several different types--Stromatactis reefs similar to the Frasnian (Devonian) reefs of the Ardennes region; blue-veined and Ptylostroma reefs similar to the Waulsortian reefs; and Lithostrotion reefs. The Ptylostroma reefs and the blue-veined reefs developed in an environment invaded by terrigenous sediments; the other types developed in clearer waters. Reef growth was controlled primarily by subsidence, which was also responsible for extinction of the reef organisms, depending on its rate relative to reef growth.
Les milieux urgoniens cantabriques
Authors: Rat Pierre
Published: March 2020

Rudistid-bearing limestones resembling those characterized by a Urgonian facies which were deposited in lower and middle Cretaceous seas of the Mediterranean region occur in northern Spain, where they are intercalated in a thick sequence of Aptian to Albian formations. In the Cantabrian basin of northern Spain frequent invasions of terrigenous material at irregular intervals interrupted development of the Urgonian reefs.
Remarques sur les faunes de lamellibranches des milieux recifaux mesozoiques (rudistes exceptes)
Authors: Freneix Suzanne
Published: March 2020

Pelecypods other than rudistids were frequent and abundant members of various biotopes of Mesozoic environments and were generally associated with subreef faunas. As a rule these pelecypods are characterized by thick shells, strong hinges, and coarse ornamentation, indicative of adaptation to a highly calcareous environment.
Age des derniers mouvements du graben de la mer Rouge determine par la methode du C14 appliquee aux recifs fossiles
Authors: Nesteroff Wladimir D.
Published: March 2020

Carbon-14 dating indicates that the uplifted reefs of the Arabian coast of the Red Sea are at least 35,500 years old. This permits estimation of the age of last crustal movements that affected the Red Sea graben.
Les recifs coralliens de la Nouvelle-Caledonie et quelques-uns de leurs problemes
Authors: Avias Jacques
Published: March 2020

In addition to a barrier reef some 1,600 kilometers long, many other types of reefs occur in New Caledonia. Various problems concerning their age, formation, and erosion are summarized.
Conduite d'une etude hydrogeologique au Gurp-Grayan-l'Hopital (Gironde)
Authors: Schoeller Henri , Pouchan P.
Published: March 2020

An example is presented of a practical program of ground-water study, as carried out in the Gurp region of Gironde, France. Reconnaissance, exploration, and analysis of the data preceded exploitation. Reconnaissance revealed the presence of three aquifers. Exploration showed that the uppermost aquifer in Quaternary dune sands was the most suitable as a source of water supply. Tabulated data on the chemistry of the waters are included.
Contribution a l'etude du minerai de fer de May-sur-Orne (Calvados)
Authors: Courty Georges
Published: March 2020

The principal iron ore bed of the May-sur-Orne district, France, consists of a mosaic layer of siderite in which oolites are rare, hematite ore, which is oolitic with a siderite cement, and spotted ore, a mixture of different ore types, in which oolites are essentially absent and in whose formation slumping is considered to have been an important factor. These are described, and their origin is worked out on the basis of an analysis of conditions of sedimentation and the physicochemical characteristics of the depositional environment.
Les roches ultrabasiques de la region de Tamatave; mode de gisement, origine et mineralisation
Authors: Giraudon Robert
Published: March 2020

The Ambodiriana series (migmatites, mica schists, and so-called amphibole pyroxenites) of the Tamatave region, Madagascar, is cut by ultrabasic intrusions, some of which carry chromite. These ultrabasic rocks have been moderately metamorphosed since emplacement. The chromite ore occurs in veinlets that dip in the same direction as the surrounding schists. Their chromite content ranges from 60 to 86 percent, but the Cr/Fe ratio is too low for metallurgical purposes.
De quelques faunes des gres inferieurs sur la bordure septentrionale du Hoggar (Sahara)
Authors: Legrand Philippe , Poueyto A. , Rouaix S.
Published: March 2020

The recent discovery of fossils in the rarely fossiliferous sandstones unconformably overlying Precambrian metamorphic rocks on the north border of the Ahaggar massif (Algeria) demonstrates the presence of Ordovician and Gotlandian (Silurian) deposits in these formations. Three new species are described--the brachiopod Dinobolus? amguidensis, the pelecypod Modiolopsis? tiounkelinensis, and Problematicum sahariense, an unidentified shell that is either a brachiopod or a pelecypod.
Donnees nouvelles sur la stratigraphie du Cretace de la region de Lains (Jura)
Authors: Guillaume Solange
Published: March 2020

Several sections in the Lains region, France, provide details concerning the stratigraphy of the Cretaceous of the western Jura mountains, particularly the lower Cretaceous. The stages, although reduced in thickness, exhibit the classic facies of the inner Juras.
Repartition du genre Amussium (pectinide) dans le Miocene de la Provence occidentale
Authors: Catzigras France
Published: March 2020

The presence of species of Amussium in Miocene deposits of western Provence, France, does not necessarily signify deep bathymetric conditions, as is generally assumed for deposits of this facies. Various observations, however, suggest that there probably was a tendency toward deepening of the depositional basin.
Galets anciens dans les cinerites pliocenes du cap d'Ail
Authors: Bourcart Jacques
Published: March 2020

Numerous pebbles of vein quartz, silicified limestone, arkosic sandstone, granite, and rhyolite have been found in Plaisancian (Tertiary) pyroclastic deposits underlying marls of Ail cape (Alpes-Maritimes) on the French Riviera. These pebbles are very different from those on the mainland; they were probably derived from an ancient upland on the site of the present Gulf of Genoa, which sank to depths of more than 2,700 meters as a result of crustal deformation in the Pliocene.
Etude d'une formation periglaciaire ancienne en Galice (Espagne)
Authors: Nonn Henri , Tricart J.
Published: March 2020

A periglacial formation above the Tertiary peneplain surface cut in schists of the plateau forming the divide between the La Coruna and Lugo drainage systems in Galicia (Spain) is an early Quaternary alluvial cone consisting of alternating beds of pebbles, gravels, and sandy-clayey material. Its age is considered pre-Riss. Its relationship with a drainage change, mode of occurrence, and characteristics serve as criteria for establishing the geomorphic evolution of the coastal zone of Galicia and adjacent areas.
Stratigraphie de la Lettenkohle dans la region de Lons-le-Saunier (Jura)
Authors: Gudefin Henri
Published: March 2020

The Lettenkohle deposits below the Keuper (Triassic) in three deep borings in the Lons-le- Saunier region, France, exhibit uniformity in the sequence and thickness of the beds in the upper zone. Thicknesses are variable in the middle and lower zones, but the total thickness is essentially the same in the borings. Traces of hydrocarbons have been found in the formation, and some production of natural gas and light oil has been obtained.
Stratigraphie du Senonien dans les Dinarides yougoslaves d'apres les rudistes
Authors: Milovanovic Branislav
Published: March 2020

Outlines the paleogeography and describes the stratigraphy of Senonian (Cretaceous) deposits in both the inner and outer zones of the Dinaric Alps of Yugoslavia. The stratigraphic scheme is based largely on rudistid faunal zones which have been established in eastern Serbia (southern Carpathians). Some horizons are very extensive, particularly certain Pironea-bearing zones. Three new varieties of Pironea polystyla (dalmatinica, bacevicensis, and dinarica) are represented in the Dinaric faunas described.
Sur la geologie de l'Istrie meridionale; comparaison avec les regions dinariques et helleniques correspondantes
Authors: Aubouin Jean , Neumann M.
Published: March 2020

Describes the Cretaceous-Eocene sequence of the southern Istrian peninsula, Yugoslavia, and compares it with corresponding sequences of the Dinaric Alps and Greece. The data indicate the presence of a topographic high in the depositional basin, extending from Greece northward to Istria, for which the name Dalmatian zone is proposed. In Greece, where it separates the Ionian trough on the west from the Pindus trough on the east, it is known as the Gavrovo zone.
Observations sur la tectonique de la region cotiere meridionale des massifs du Parnasse-Kiona [with discussion]
Authors: Celet Paul
Published: March 2020

The structural relations of the Parnassus and Pindus zones (Greece) have been studied in the light of geologic observations north of the Gulf of Corinth. Outcrops exhibiting inner Pindus facies near Galaxidia and south of Desfina show that overthrusting of the Parnassus zone is considerably more extensive in this area than previously known. A series of sections illustrates the emplacement of the structural units and the modes of mechanical deformation of the nappe and its substratum.
Sur les cuticules de Cordaitales; note preliminaire
Authors: Ledran Christiane
Published: March 2020

Preliminary results of a systematic study of cordaitalean leaf cuticles suggest new criteria for more precise definition of species belonging to the order.
Caracteres generaux des tonsteins du bassin stephanien de Lons-le-Saunier (Jura); note preliminaire
Authors: Lienhardt Georges
Published: March 2020

Study of different claystones in the Stephanian (Carboniferous) deposits of the Lons-le-Saunier coal basin, France, shows that they retain certain features over relatively long distances. The x-ray diffraction pattern, in particular, is often typical of a given claystone. Kaolinite is practically the only clay mineral present. The claystones must have been derived from the soil cover of a continental land area.
Contribution a l'etude stratigraphique du bassin secondaire du Haut-Atlas occidental (sud-ouest marocain)
Authors: Duffaud Francois
Published: March 2020

Detailed studies in the Mesozoic basin of the western High Atlas region in southwestern Morocco show that two sedimentary cycles are represented in the Triassic. Details of the Jurassic stratigraphy are clarified on the basis of new macro- and microfaunal data and facies studies, and the principal microstratigraphic characteristics of the different Cretaceous and Tertiary stages are summarized.
Stratigraphie de l'Ordovicien de la partie occidentale du jbel Bani et du jbel Zini, Anti-Atlas occidental (Maroc)
Authors: Destombes Jacques
Published: March 2020

Stratigraphic studies in the western part of the Bani and Zini massifs in the western Anti-Atlas range of Morocco show that there is an intra-Caradocian erosional unconformity. The Ordovician section (700 meters) consists mainly of shaly and sandy Arenig beds, dated by graptolites; shaly and sandy Llanvirnian beds (50 meters) are discordantly overlain by coarse and conglomeratic Caradocian beds containing granite pebbles, overlain in turn by shaly lower Llandoverian strata.
Les grands traits structuraux et l'evolution du territoire calabro-sicilien (Italie meridionale)
Authors: Caire Andre , Glangeaud L. , Grandjacquet C.
Published: March 2020

Two major orogenic periods are distinguished in the Tertiary evolution of Calabria and Sicily in southern Italy. In the Oligo-Miocene phase the Sicilian promontory of north Africa moved toward the Apennines, causing formation of thrust wedges and ejection of plastic material This phase was followed by a series of readjustments accompanied by active sedimentation in the basins. In Pliocene-Quaternary time, deformation in the sedimentary mantle shaped the Calabro-Sicilian arc, whose various sections were subjected to differential dislocation.
Les caracteres structuraux des montagnes de la region de Kaboul (Afghanistan)
Authors: Mennessier Guy
Published: March 2020

In the mountains of the Kabul region, Afghanistan, the folded metamorphic basement of undetermined age is unconformably overlain by a thick cover of Permian to upper Cretaceous limestones capped by upper Cretaceous to Lutetian (Eocene) shales and limestones with ophiolites. Following the major orogenic phase, in the upper Nummulitic (Tertiary), deformation of the basement caused dislocations in the cover (folds, thrusts, and important normal faults). Basement deformation involved recurrent movement along faults (generally dipping 45 degrees ) or the thinning of certain less competent beds.
Apercu sur le Quaternaire de Salvador (Amerique centrale)
Authors: Tricart Jean
Published: March 2020

El Salvador is essentially a volcanic region in which an older, presumably late Tertiary, complex of andesite and basalt flows and breccias and younger, more acid Quaternary rocks are represented. Following a long period of inactivity during which the Tertiary volcanic masses were considerably eroded, episodic explosive activity occurred in the Quaternary, accompanied by the formation of extensive calderas and ejection of considerable ash. Paleosols were developed in the intervals between explosions, which permit relative dating of the successive episodes. The last stages of activity were characterized by extrusion of mud flows, torrential gullying, and deposition of thick piedmont detrital beds accompanied by reworking of volcanic ash which was redeposited in dammed lakes and other depressions. The development of calcareous crusts in places constitutes evidence of significant climatic fluctuations. There is also evidence of differential subsidence in coastal areas.
Faille oblique de Jolimont (Toulouse, Haute-Garonne)
Authors: Astre Gaston
Published: March 2020

Excavations for construction at Jolimont revealed an oblique fault, a type hitherto unknown in the Stampian (Tertiary) marls of the Toulouse region, France. It reflects the effects of deep-seated tectonic activity. Its orientation confirms the almost north-south play of fractures in the center of the sub-Pyrenean basin.
Un massif granitique de l'Ahaggar a mode de gisement hybride; le Tihoiiarene
Authors: Boissonnas Jean , Gravelle M.
Published: March 2020

The Tihoiiarene granite massif is a crescent-shaped body on the northeastern margin of a large syntectonic massif of porphyritic granite in the Ahaggar mountains, Algeria. The contact of the Tihoiiarene massif with epimetamorphic Precambrian formations is typically intrusive, but its contact with the porphyritic granite is blurred in places, clear-cut in others, thus providing no evidence of chronologic relationships. Similar cases are known elsewhere; possibly there is a direct relation between the migmatitic (or anatectic) and intrusive granites, the latter grading into subvolcanic plutons.
Sur quelques ammonites du Lias inferieur du Haut-Atlas marocain
Authors: Dubar Gonzague
Published: March 2020

Describes Bouhamidoceras zizense n.g. n.sp. (belonging to the Juraphyllitidae), in different stages of development, from lower Liassic deposits of the High Atlas mountains, Morocco, and four other ammonites from middle and upper Lotharingian (Jurassic) deposits.
Louis Doncieux, 1874-1960
Authors: Viret Jean
Published: March 2020

A biographic sketch of the French paleontologist L. Doncieux, with a bibliography of his works.
Modification des pressions intracristallines et intergranulaires des roches soumises aux variations de temperature
Authors: Deicha Georges
Published: March 2020

Effects of variations of temperature on intracrystalline and intergranular pressures in rocks are reviewed, with particular stress on the importance of maintaining the several factors involved in proper perspective, in order that sequence of changes in a rock during its history may not be misconstrued and that undue importance is not assigned to a given factor merely because it has been investigated in detail while others have been investigated inadequately. Distinguishing between liquid and gaseous inclusions of mineralogic versus metallogenic periods is especially difficult. Proper interpretation of inclusions ruptured by natural means must be supplemented by painstaking care to recognize the ruptures resulting from artificial means such as those produced in preparation of petrographic specimens, blows of the geologic hammer , and during transportation of samples. Liquid CO<2) and other inclusions have been known to rupture from small temperature changes. Water in inclusions in mineral grains can influence the geochemical constitution of water imprisoned in the sediments at time of deposition. Tectonic movements may rupture inclusions, and thereby influence the geophysical history of rocks.
Granites et diorites de la region de Senones (Vosges)
Authors: Nicolas Adolphe
Published: March 2020

The Raon-l'Etape and Senones granite massifs and the Etival diorite massif represent three successive stages of differentiation of magma intruded into the Devonian-Dinantian (Carboniferous) complex of the Vosges mountains, France, during the igneous activity associated with the Hercynian orogenic cycle (late Paleozoic). The diorite massif is the oldest and may have been emplaced before or during the first phases of the orogeny. Formation of the granite massifs took place after the main phase of dislocation.
Le delta vindobonien du bas-pays de Saint-Maximin et de Ginasservis (Var)
Authors: Cornet Cecile
Published: March 2020

General hydrographic relationships of the Saint-Maximin plain during the Vindobonian (middle Miocene) can be determined from the lithology and distribution pattern of the detrital deposits presently covering much of the plain. These deposits are deltaic shale, marl, sandstone, puddingstone conglomerate, tuff, and lignitic clay. They overlie locally-exposed detrital deposits of upper Cretaceous-lower Miocene age, and marl and limestone of Triassic, Jurassic, and Cretaceous age. The plain is largely structural in origin. One fault crops out for more than 20 km. The delta was deposited by abundant runoff from the Maures and Esterel massifs debouching into the Durancian gulf of the Vindobonian sea at Vaulongue.
Maquette d'une carte metallogenique de France au 2 500 000e
Authors: Laffitte Pierre , Permingeat Francois
Published: March 2020

Tectonic, magmatic, metasomatic, and paleogeographic factors important in the formation or localization of metalliferous deposits can be shown satisfactorily at a scale of 1:2,500,000. These are termed metallogenic determinant elements. Metal or mineral deposits are represented by symbolic colors: bright ones for metals and pale ones for the determinants. Deposits, groups of deposits, or indices are shown by figures in the bright colors of the group. Many problems complicate the planning of the map, especially such structural features as the trends in the Armorican massif, the Hercynian tectonic features, and geosynclinal zone relationships.
Utilisation de la radioactivite naturelle du potassium pour son dosage dans les roches par spectrometrie gamma
Authors: Jouve B. , Lansiart A. , Letolle Rene , Morucci J. C.
Published: March 2020

The flame spectrometer permits rapid determination of potassium in rocks, but requires long and delicate manipulations to obtain suitable results. Highly sensitive methods of detecting natural radioactivity suggested the possibility of determining potassium by its gamma radioactivity. Total radioactivity would not give the desired results because potassium normally is accompanied by thorium or uranium in rocks. Gamma spectrometry would permit establishing the proportion between these. The theory, equipment, and methods are discussed in detail and results obtained are good approximations.
Remarques stratigraphiques et tectoniques sur la region de Novara di Sicilia (monts Peloritains, Sicile)
Authors: Truillet Rene
Published: March 2020

North of the limestone chain, in the metamorphic zone of the Peloritani mountains of Sicily, Jurassic limestones are thrust over a conglomerate of Eocene or Oligocene age. The thrust occurred prior to deposition of the Oligocene-Miocene molasse of the region. Molasse and Jurassic limestones are structurally imbricated and in places phyllites are thrust over the limestones and conglomerate. The plastic behavior of the phyllites, and the intensity of erosion since deformation, have resulted in more recent movements on a large scale that further complicate determination of the structure.
Sur les divisions du Dogger dans la vallee de la Creuse (Indre); correlation avec le sud-est du Bassin parisien
Authors: Fischer J. C.
Published: March 2020

Stratigraphy of the Dogger (middle Jurassic) in the southwestern part of the Paris basin, at the north border of the Central Massif is very poorly known because facies are monotonous and outcrops and fossils are scarce. A starting point for working out the stratigraphy is provided by the Creuse river valley, from Argenton-sur-Creuse northwestward to St. Gaultier. Stratigraphic correlations with the southeastern part of the Paris basin were made from 21 good outcrops in the Creuse valley area despite the lack of characteristic ammonites. Dogger formations total more than 100 m thickness, chiefly marine neritic limestones, with intercalated marl in the upper portion. Several meters of lagoonal marl and lignite above the base of the Dogger are transitional from lower to middle Bathonian (upper Dogger). Brachiopods and corals, including reef types, are the chief means of correlation.
Nouvelles observations sur le bassin tertiaire d'Aurillac (Cantal)
Authors: Rey Roger
Published: March 2020

Paleontological investigation of the Oligocene beds in the Tertiary Aurillac basin (France) provides evidence that at the type locality--Puy de Vaurs--the marly limestones are in the upper Stampian, the gravelly shale being attributed to the lower Stampian, a conclusion confirmed by the stratigraphy of neighboring regions in the Saint-Flour basin and Limagne. The tuffs at Pont-de-Gail--southern flank of Cantal--which contain an upper Miocene mammalian fauna, probably correspond to the first eruptive phase of the volcano. A long period of continental alteration followed, succeeded by a second eruptive phase. This was followed by quartzose sedimentation and andesitic intrusion. A new foraminifera species, Caecilianella aurillacensis, is described from the upper Stampian at Puy de Vaurs.
La structure des series nummulitiques de Bejaoua oriental (Tunisie). Note preliminaire
Authors: Kujawski H.
Published: March 2020

Preliminary results of paleontologic and petrographic study of the structure of the Nummulitic series (Paleogene) of eastern Bejaoua, near Mateur indicate that all the clays which separate the Eocene limestone beds of northern Tunisia are not of the same age--some are Priabonian and not the transition clays of the Cretaceous-Tertiary. Distribution of isolated sandstone blocks prove that the area was entirely covered by the sea during the upper Nummulitic (Paleogene). Reinterpretation of the structure shows that the area is a series of simple anticlines and synclines, the Nummulitic series forming a synclinorium.
Marius-Gustave Dalloni (1880-1959)
Authors: Laffitte Robert , Casteras Marcel
Published: March 2020

A biograpy of the French geologist Marius-Gustave Dalloni (1880-1959) with particular emphasis on his work in the Pyrenees, Algiers, and the Sahara with a list of his publications.
Les zones d'ammonites du Cenomanien nicois
Authors: Thomel Gerard
Published: March 2020

A restudy of the Cenomanian ammonites of the Nice area, southeast of the Maritime Alps (France), suggests that the conclusion of H. Parent (1945) that the fauna of the upper Cenomanian also occurs in the lower Cenomanian is erroneous. Actually the ammonite zones here conform with those of the rest of the world. Reexamination of Parent's specimens showed that they were too poorly preserved to be identified specifically or, at times, even generically. Subsequent revision of the Chateauneuf fauna revealed that it was entirely lower Cenomanian with the exception of Calycoceras boulei Coll. The locality north of Peille is chosen as the type locality for the Nice Cenomanian. The ammonite zones of the Iberian peninsula, the southeast Maritime Alps, and Madagascar are correlated in a table.
Application de la methode des mineraux lourds a quelques problemes morphologiques des Abruzzes adriatiques
Authors: Demangeot Jean , Ters M.
Published: March 2020

Heavy mineral analysis of samples from the Adriatic side of the Abruzzi mountains gives an indication of the age of the surface of the Gran Sasso plateaus and of the Quaternary continental formations. The absence of heavy minerals characteristic of the Pontian molasse suggests the possibility that the plateaus were never completely covered by the Pontian sea. The isolated molasse deposits which have been reported from the Gran Sasso may have been deposited in small gulfs along the shore of the sea. The Quaternary marine sediments have been dated by their fossil content. The majority of the Quaternary deposits, however, are gravels, breccias and eolian loams which contain neither fossils nor pollen. Cinder showers from Quaternary eruptions on the Tyrrhenian side of Abruzzi were carried by the wind and deposited volcanic minerals which were incorporated in the Quaternary material of the central Apennines. Heavy mineral analysis of the deposits containing these minerals reveals associations which provide a basis for determining the chronology of the Quaternary strata.
Cimentation variable et ferruginisation zonee de niveaux quartzitiques appartenant au 'gres de May' (synclinaux paleozoiques de May-sur-Orne et d'Urville, Calvados)
Authors: Poncet Jacques
Published: March 2020

The May sandstone which crops out in the Paleozoic synclines south of Caen (France) is characterized by ferruginous red-brown veinlets in a predominantly light gray quartzite. Petrographic analysis of the beds reveals a succession of three zones which have certain characteristics in common: quartz grains interpenetrating and shaping each other; grains with radial fissures; and grains including heavy mineral incrustations. These characteristics indicate mechanical action imposed on the sands after their deposition. Three stages in the formation of the sandstone are distinguished. The first phase includes sedimentation, burial and compaction of the deposits, resulting in the formation of stylolites in the biotite layers and establishing variable degrees of cementation as illustrated by the passage of sandstone and quartzite into orthoquartzite. Fracturing during the Hercynian orogeny marks the second phase. In the last phase, meteoric water circulated through the diaclases perforated by stylolites. The biotite was then hydrolyzed, liberating iron which was carried by the water and deposited as hematite veinlets which give the May sandstone its peculiar red color.
Etude de quelques formations detritiques du Cretace moyen du Jura
Authors: Duplaix Solange , Guillaume S.
Published: March 2020

Stratigraphic and mineralogic study of the heavy and light minerals from Cretaceous (Aptian-upper Albian) localities in the Jura (France) indicate their similarity to the neighboring regions. The formations show a uniform mineralogic composition. Qualitative mineralogical analysis of the heavy minerals shows that the Albian sands are homogeneous, essentially composed of tourmaline, zircon, rutile, anatase, and garnet. Andalusite is found frequently and is more abundant than epidote. Mineralogical analysis of the light minerals from the different areas shows that quartz is abundant in all the beds in varying degrees. Glauconite is present in some of the sand beds.
Plusieurs types morphologiques distincts d'Orbitolites de l'Ilerdien pyreneen
Authors: Lehmann Roger
Published: March 2020

Four new species of foraminifera are described from the Ilerdian (Paleocene) of the Pyrenees of France and Spain: Orbitolites gracilis n.sp., O. biplanus n.sp., O. latimarginalis n.sp., and O. ibericus n.sp.
Les Deinotherides d'Espagne
Authors: Bergounioux Frederic Marie , Crouzel Fernand
Published: March 2020

Miocene deinotherids from Vieille Castille, Catalonia, and the Betic zone are described and compared. Certain anatomic features are explained as resulting from geographic isolation, and are not considered valid for proposal of new species.
Le Brioverien. Esquisse des caracteres stratigraphiques, metamorphiques, structuraux et paleographiques de l'Antecambrien recent dans le Massif armoricain
Authors: Cogne Jean
Published: March 2020

The stratigraphic characteristics of the Brioverian from Normandy to the Vendee reflect a complete geosynclinal cycle younger than the Pentevrian (Precambrian) but completed before the Cambrian transgression. The Brioverian is the basement rock of the Armorican massif, and thus has the largest areal extent of any Precambrian formation in France. The lower part consists of epimetamorphic basic rocks (ophiolites). The middle part is feldspathic sandstone, phtanite, quartzite, and phyllitic shale. After a short period of emergence, the upper beds were deposited, consisting of the Saint Germain-le-Gaillard rhyolite, the Granville tillite complex, and shale and sandstone at the top. Cadomian folding and granitic intrusion occurred, forming the Cadomian chain prior to Cambrian transgression, and thereby affecting the structure of the Armorican massif. The Brioverian clearly was a folded and partially granitized sole before the dawn of the Paleozoic, but the exact dates of the deposition of the Brioverian and of the Cadomian orogeny are still hypothetical.
Quelques elements structuraux des environs de Castrovillari et de Morano-Calabro (Calabre, Italie meridionale)
Authors: Bousquet Jean Claude
Published: March 2020

Five distinct tectonic units near Castrovillari and Morano-Calabro in the northern part of Calabria contain the Campo-Tenese calcareous dolomite unit; the quartzitic epizonal lower flysch; the Castrovillari-Morano calcareous dolomitic unit; the upper flysch, a quartzitic calcareous flysch and the Mount Pollino calcareous dolomitic unit. The Mount Pollino is separated from the lower units by recent thrust faults and may be part of the strata underlying the other four.
Les series calcaires sous-jacentes a la formation de Reitano, dans la region de Caronia-Mistretta-Castel di Tusa, Monts Nebrodi (Sicile septentrionale)
Authors: Duee G.
Published: March 2020

Underlying the Reitano marl of northern Sicily (Italy) is an almost continuous band of vari-colored clay which seems to correspond to the Monte Soro flysch. Their similarity and the presence of Cretaceous flysch with an abundance of quartzitic sandstones near Caronia suggest that the Monte Soro flysch and the Reitano formation were deposited in the same or contiguous zones. The clay is overlain by Eocene limestones and conglomerates similar to beds of the Peloritani mountains. Underlying the clay are the Polizzi series whose upper contact is probably not conformable.
Contribution a l'etude structurale du groupe Judica (Sicile orientale)
Authors: Schmidt di Friedburg Paolo , Trovo Antonio
Published: March 2020

The Judica mountain group of eastern Sicily (Italy) contains three limestone chains, five to ten kilometers long, surrounded by clay beds. There had been some disagreement about the group, some workers believing they were anticlinal strata in normal stratigraphic sequence and others maintaining that they were a chaotically displaced mass without stratigraphic relationship. New studies and seismic exploration indicate that the group is a system of displaced limestone blocks with clay beds at their base. The bottom surface seems to have functioned as a plane of parting for the allochthons whose displacement began during the Miocene and continued into the Pliocene.
Structures megametriques et evolution de la mer Tyrrhenienne et des zones perityrrheniennes
Authors: Grandjacquet Claude
Published: March 2020

A large view of the evolution and structural history of the Tyrrhenian sea and bordering areas suggests that towards the end of the Permian distensions occurring in the western Mediterranean resulted in the opening of a passage to the Atlantic. Lower Eocene deformations along the Sicilian-Tunisian front were either due to local marginal disequilibrium or to the northern drift of the African continent. Oligocene emergence is evident in the Apennines and in Calabria through the existence of widespread hiatuses and by bauxitic and ferruginous beds. Large scale Oligocene movements brought the African continent to its maximum proximity with Europe. It was in the same period that the clay scaglia and flysch nappes began sliding in Tuscany although the movement of Calabrian nappes in southern Italy did not occur until the lower and middle Miocene.
Zone preapulienne, zone ionienne et zone du Gavrovo en Peloponnese occidental
Authors: Aubouin Jean , Dercourt Jean
Published: March 2020

The stratigraphy of faulted calcareous massifs in the western Peloponnesus, east of the front of the Pinde nappe, is examined. The Klokova, Skolis, Lapithos, and Pylos massifs, directly bordering the front of the nappe belong to the Gavrovo zone. Surrounded by discordant Pliocene, they are post-paroxysmal, late Miocene and Pliocene. The Cape Pappas massif displays an upper Cretaceous to Eocene series with facies corresponding to the Ionian zone, further north. The island of Zante belongs to the Preapulian zone. The Ionian trough is observed to be narrower in Peloponnesus than in northern Greece, suggesting an axial termination to the south.
Observations sedimentologiques et paleontologiques sur le Bartonien d'une nouvelle coupe a la Chapelle-en-Serval (Oise)
Authors: Pomerol Charles
Published: March 2020

At a new road cut near Chapelle-en-Serval (France) a sedimentary sequence is exposed in which Beauchamp facies continental sands and sandstones are overlain by coarse lagoonal sandstones of the Ducy formation, in turn overlain by calcareous sandstones of the Mortefontaine formation, and capped by silty limestone of the St. Ouen formation. The Beauchamp-Ducy contact marks the boundary between Auversian and Marinesian time and indicates a post-Auversian emergence. The rapid increase of Discorbis bractifera in the Ducy beds indicates a lagoonal environment associated with the lacustrine deposition. The Marinesian transgression is indicated by increasing salinity observed in the succession of faunal assemblages.
Nouvelles donnees sur les Ammonodes triasiques du gisement de l'Asklepieion (Argolide, Grece)
Authors: Dufour Thierry
Published: March 2020

New species and varieties of ammonites were found in the Asklepieion bed of siliceous red limestone on the Argolide peninsula of northeastern Peloponnesus. Most of the fossils in the bed were covered by a pellicle composed of a mixture of iron and manganese. One hundred specimens, representing 35 species and varieties, are listed. Among these is one new species, Joannites renzi, and the following three new varieties: Joannites cymbiformis (Wulfen) var. decourti; Joannites klipsteini Mojs. var. bourrouilhi, and Arcestes pannonicus Mojs. var. termierae.
Les unites superieures de la Sierra Espuna (Espagne)
Authors: Paquet J.
Published: March 2020

The Sierra Espuna massif of Murcia is composed of tectonic units of which only the upper four were studied. In the south, the Morron de Totana unit exhibits a series of beds almost continuous from the Permo-Triassic to the upper Eocene-lower Oligocene. It is overlapped to the northeast by the Prat Mayor unit, characterized by middle Cretaceous glauconites, upper Cretaceous limestone with Microcodium beds, and lagoonal to continental Paleogene deposits. Overlapping the Prat Mayor is the Perona unit, characterized by Pliensbachian (lower Liassic) marl-sandstone and ferruginous rocks. The El Bosque unit covers the others and is thought to have a more southerly origin than the preceding three. These units have been previously included in a single structural complex.
Stratigraphie du Cretace terminal et de l'Eocene en bordure des Mogods (Tunisie septentrionale)
Authors: Crampon Norbert , Sigal Jacques
Published: March 2020

In the vicinity of Bizerte and Hedil, the Cretaceous and Eocene disappear to the west under the thick sandstones of the Khroumirie and Mogods formations, the Tunisian extension of the Numidian sandstones. The study of the different beds of the late Cretaceous and Eocene, from the detailed data and microfaunal identifications, has provided a precise outline of the stratigraphy and paleogeography in a region of incipient orogeny: recognition of microfaunal zones, age of the series, rapid variations in thickness and facies, permanence of early orogenic movements, confirmation and generalization of the transgressive character of the Khroumirie sandstones.
Le banc des Hermelles de la baie du Mont-Saint-Michel, bioherme a annelides; sedimentologie, structure et genese
Authors: Mathieu R.
Published: March 2020

The Hermelles bank is a bioherm built by sedentary polychaete annelids along the coast of the English Channel (Bay of Saint-Michel). Situated in the lower part of the intertidal zone, the bank forms a mass over 400 hectares in surface area. Compilation of a detailed map has permitted a precise analysis of the 'reef' constructions and the associated sediments (biogenic sands, fine sands, calcareous mud) and the proposal of a hypothesis concerning the genesis and evolution of the bank. The faunal association encountered is not characteristic of the bank; the bioherm is characterized by the favorable environmental conditions found there by the organisms. The hydrodynamic regime dominant in this part of the Bay of Saint-Michel is responsible for the establishment and development of the reef complex.
Contribution a l'etude sedimentologique des terrasses quaternaires du Roussillon
Authors: Got Henri
Published: March 2020

Quaternary gravel terraces, genesis and provenance of sediments, size sorting, evolution of hydrographic system, paleoclimates, France
Precisions sur la stratigraphie de la serie des calcaires du Djebel Bechar (Namurien-Moscovien) a l'est de Bechar (Algerie)
Authors: Legrand-Blain Marie
Published: March 2020

Bechar limestone series, stratigraphic subdivision, brachiopods, goniatites, Carboniferous
Sur le chevauchement sud-provencal; le noeud de Pichauris, Peypin, Auriol
Authors: Aubouin Jean , Chorowicz Jean , Fosse Martine , Wettel Christiane
Published: March 2020

Allochthonous hills, stratigraphic units, structural features, relation to adjacent massifs, tectogenesis, France
Bois de structure gymnospermienne provenant du Vraconnien de la region de Blieux (Basses-Alpes)
Authors: Lemoigne Yves
Published: March 2020

Araucarian-type structure, new species, lower-upper Cretaceous transition beds, France
Sur la presence du Miocene marin en bordure sud de l'arc de Nice, dans la region de Roquebrune-Cap-Martin (Alpes-Maritimes)
Authors: Anglada Roger , Follacci Jean Paul , Meneroud Jean Pierre
Published: March 2020

Lithofacies, microfaunal lists, SW-NE-trending Miocene gulf at the base of Jurassic cliffs, France
Le chevauchement sud-provencal; de l'Etoile a la Sainte-Baume
Authors: Aubouin Jean , Chorowicz Jean
Published: March 2020

Paleogeography, tectogenesis, structural zonation, northern and southern Provence tectonic phases, Cretaceous-Miocene, France
Un exemple de tectonique tangentielle; l'evolution du cadre montagneux de Marseille
Authors: Guieu Gerard
Published: March 2020

Overthrusting, folds, detrital accumulations, compensatory movements, middle Triassic-Quaternary paleogeography and tectogenesis, France
Quelques resultats des recherches sur le Permien polonais
Authors: Krason Jan
Published: March 2020

Stratigraphic units, regional distribution, correlation chart, mineral resources
Reflexions sur la finalite des mesures geochronologiques (periodicite des evenements du Precambrien et derive des continents)
Authors: Choubert Boris
Published: March 2020

Precambrian magmatic cycles, U 235 half-life, correlations, orogeny-sedimentation megacycles, rhythmic evolution of earth's crust
Sur la stratigraphie et la tectonique du groupe du Jebel Musa (Rif septentrional, Maroc)
Authors: Durand Delga Michel , Villiaumey Michel
Published: March 2020

The allochthonous Musa group of upper Triassic shale, Jurassic limestone, dolomite, marl, and radiolarite, and Cretaceous to Paleogene clastics lies upon Senonian (upper Cretaceous) autochthonous marl and shale of the Tangier massif at the north end of the Rif mountains in Morocco. The group more closely resembles the formations of the Gibraltar area than nearby formations to the south in Morocco. The significance of the Beliounis flysch, believed to be of Cretaceous to Oligocene age, is unexplained. It may be a remnant of the cover of the Musa group although presence of other facies of the same age in the area contradicts this possibility.
Sur les assises oligocenes et ludiennes, a la limite ouest de l'Ile-de-France, entre la Seine et l'Eure
Authors: Feugueur Leon
Published: March 2020

Exploratory boreholes for the Breval tunnel between the Seine and Eure river valleys west of Paris encountered the Stampian (Oligocene) Fontainebleau sands, the Sannoisian (lower Oligocene) Brie limestone, grit, clays, and marls, and the Ludian (upper Eocene) marls and Champigny limestone. A complete section of the Paleogene formations of the Breval area previously was not obtainable because of the scarcity of outcrops.
Etude stratigraphique dans le Gebel Nefousa et le Gebel Garian (Tripolitaine, Libye)
Authors: Magnier Philippe
Published: March 2020

The cuesta forming the Gebel Nefousa and Gebel Garian in northwestern Libya exposes the discordant middle Cretaceous lying on formations ranging from Triassic to Jurassic. A study of 84 sections resulted in correlation of formations exposed in the escarpment with exploratory boreholes in other localities.
Remarques sur l'eruption du Katmai et de la Vallee des Dix-Mille-Fumees et sur le probleme des ignimbrites
Authors: Bordet Pierre , Tazieff Haroun
Published: March 2020

During the eruption of Mt. Katmai, June 1912, about 15 cu km of volcanic ejecta, since named "Katmai tuffs", was deposited. Recent field and laboratory work shows that this is ignimbritic dacite. The eruption can be reconstructed despite lack of direct observation. Accompanied by violent earthquakes, the ignimbrites, passing through a foamy stage before being pulverized, issued from fissures at the head of the Valley of Ten Thousand Smokes and fell in the valley like snow over about 20 km to a thickness exceeding 100 m. The ignimbrites were then covered by about 10 cu km of ash which erupted from the caldera of Mt. Katmai. The whole eruption lasted 16 hours. Thie is the only known historic case of ignimbrite formation.
Sur l'existence, en Provence, d'une phase tectonique oligocene d'origine profonde
Authors: Cornet Cecile
Published: March 2020

The results of a study of structures in the Triassic units of southeastern France suggest the existence of an Oligocene tectonic phase independent of those in the late Cretaceous and late Eocene. In the areas studied (Barjols, Huveaune, Grapeau, Gareoult) the structures are essentially vertical with no evidence of lateral displacement. Deep seated movement in the basement complex produced uplift and faulting. As a result of this activity, the Stampian deposits contain conglomerates with elements produced by the fragmentation of the Permian and basement complexes. The age of the orogenic movements is post-Eocene. It is clear that deformation was complete before the Vindobonian (Miocene) as evidenced by the continental deposits of that age which overlie the Triassic structures. Also the Vindobonian deposits which overlie the Jurassic and Cretaceous in other areas are at the same level as those overlying the deformed Triassic strata. Because the faulting has affected part of the Stampian deposits it could be concluded that deformation was post-Stampian. However, in the Huveaune basin where the faults limiting the Triassic structure affect the Stampian deposits, the structures are directly overlain by the Stampian, proving that the orogenic and glyptogenic phenomena were contemporaneous, and establishing a Stampian age for the tectonic phase.
Etude de quelques Viverrides (mammiferes, carnivores) du Pleistocene inferieur du Tanganyika (Afrique orientale)
Authors: Petter Germaine
Published: March 2020

Among the fossils recovered from Villafranchian volcanic tuffs (southeast of Lake Victoria) were species belonging to the subfamilies Herpestinae and Viverrinae: Herpestes palaeoserengetensis (Dietrich), H. palaeogracilis (Dietrich), Mungos dietrichi n. sp., Mungos sp., Viverra leakeyio n. sp. Examination of major differences between the denture structure of Herpestes and Mungos justifies the reallocation of the species originally assigned to the genus Mungos by Dietrich (1942) to the genus Herpestes. V. leakeyi is the first viverrid species reported from the Pleistocene and the first representative of the genus found on the African continent. Fossil species of Viverra are previously known only from the Vindobonian (Miocene) of Europe; two living species inhabit southeast Asia.