Sur la stratigraphie et la tectonique du groupe du Jebel Musa (Rif septentrional, Maroc)

1963 ◽  
Vol S7-V (1) ◽  
pp. 70-79 ◽  
Author(s):  
Michel Durand Delga ◽  
Michel Villiaumey
Keyword(s):  
Upper Cretaceous ◽  
Upper Triassic ◽  
The South ◽  
The North ◽  
Jurassic Limestone ◽  
North End

Abstract 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.

The Mesozoic-Tertiary evolution of the Aquitaine Basin

1982 ◽  
Vol 305 (1489) ◽  
pp. 63-84 ◽  
Keyword(s):  
Upper Cretaceous ◽  
Oil Fields ◽  
Upper Eocene ◽  
The South ◽  
Gas Field ◽  
Massif Central ◽  
Tectonic Plates ◽  
The North ◽  
Basic Magmatism ◽  
Aquitaine Basin

The Aquitaine Basin, situated in southwest France, with an area of about 60 000 km 2 , has the form of a triangle which opens towards the Atlantic (Bay of Biscay) and is limited to the north by the Hercynian basement of Brittany and the Massif Central, and to the south by the Pyrenean Tertiary orogenic belt. Beneath the Tertiary sequence (2 km thick, and which outcrops over much of the basin) a Mesozoic series, up to 10 km thick, rests generally on a tectonized Hercynian basement but locally it covers narrow (NW-SE-trending) post-orogenic trenches of Stephano-Permian age. The Mesozoic history can be subdivided into four major structural-sedimentary episodes: (1) during a Triassic taphrogenic phase a continental-evaporitic complex developed with associated basic magmatism; (2) throughout the Jurassic, a vast lagoonal platform developed, initially (Lower Lias) as a thick evaporitic sequence followed by a uniform shale-carbonate unit, indicating a relative structural stability; (3) the end of the Jurassic and the Lower Cretaceous saw a fragmentation of this platform, due to an interplay between the Iberian and European tectonic plates, resulting in an ensemble of strongly subsident sub-basins; (4) during the Upper Cretaceous and until the end of the Neogene, the evolution of the Aquitaine Basin was influenced by the Pyrenean orogenic phase, with the development, towards the south, of a trench infilled by flysch which, from the Upper Eocene, is succeeded by a thick post-orogenic molasse complex. The main hydrocarbon objectives in the basin are situated in the Jurassic platform (e.g. the Lacq giant gas field) and the Cretaceous sub-basins (e.g. the Cazaux and Parentis oil fields). To date, production has been about 4 x 10 7 m 3 of oil, and about 15 x 10 10 m 3 of gas since the first gas discovery (St Marcet) in 1939.

Transporting Urban Inequality through Public Transit Designs & Systems

2017 ◽  
Vol 16 (4) ◽  
pp. 364-368 ◽  
Author(s):  
Gwendolyn Y. Purifoye
Keyword(s):  
The South ◽  
Large White ◽  
Train Station ◽  
Urban Inequality ◽  
Bus Stop ◽  
Far North ◽  
The North ◽  
Predominantly Minority ◽  
Bus Stops ◽  
North End

Four large, and often overflowing, dumpsters are situated at one of the more than dozen bus stops at the Chicago Transit Authority's (CTA) Red Line 95th Street/Dan Ryan train station. This station is on the city's far south side and the ridership on the buses that board and disembark there and the train is predominantly minority. On a warm or hot day, the smell of bus engines and dumpster contents fill the waiting areas. One 28–year–old Black male passenger (BMP) noted, as he stood at one of the nearly one dozen (no seating available) bus stops at the station, “In the summer it's really horrible because of the smells, flies, and bees.” He also added that as far as he could remember “they've [the bus stop dumpsters] been here my whole life” (June 2012). His experience at the south end of this train line, which also has a majority minority ridership, is starkly different from the waiting experiences on the far north end of the same line, Howard Street, where the ridership is diverse (with a large white ridership). The north end station is surrounded by shops and restaurants, more open waiting spaces, and places to sit to wait for buses that travel through the adjoining bus depot. There are no bus stop benches at the south end station, even though there are over a dozen buses that use that station's depot.

Contribution a l'etude tectonique du versant nord du massif de la Lare; les collines d'Encauron et des Lagets

1966 ◽  
Vol S7-VIII (7) ◽  
pp. 938-945
Author(s):  
Jean Aubouin ◽  
Jean Chorowicz ◽  
Nicole Le Dore
Keyword(s):  
Upper Cretaceous ◽  
The South ◽  
The North ◽  
Historical Geology

Abstract The Encauron Jurassic hills are allochthonous on the upper Cretaceous Etienne syncline which borders the Lare anticline on the north. The Lagets hills are autochthonous--relatively--and represent the north flank of the Etienne syncline and the south flank of the Huveaune Triassic belt. Superposed tectonic phases are emphasized, being represented by three successive groups of structures: overthrusts, folds, fractures. After an account of the historical geology, the Encauron hills are compared with the Sainte Baume series.

scholarly journals A Cretaceous dinoflagellate cyst zonation for NE Greenland

2019 ◽  
Vol 157 (10) ◽  
pp. 1658-1692 ◽  
Author(s):  
H. Nøhr-Hansen ◽  
S. Piasecki ◽  
P. Alsen
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Upper Cretaceous ◽  
Barents Sea ◽  
The South ◽  
Norwegian Sea ◽  
Dinoflagellate Cyst ◽  
The North ◽  
Northern North Sea ◽  
First Time

AbstractA palynostratigraphic zonation is for the first time established for the entire Cretaceous succession in NE Greenland from Traill Ø in the south to Store Koldewey in the north (72–76.5° N). The zonation is based on samples from three cores and more than 100 outcrop sections. The zonation is calibrated to an updated ammonite zonation from the area and to palynozonations from the northern North Sea, Norwegian Sea and Barents Sea areas. The palynozonation is primarily based on dinoflagellate cyst and accessory pollen. The Cretaceous succession is divided into 15 palynozones: seven Lower Cretaceous zones and eight Upper Cretaceous zones. The two lowermost zones are new. The following five (Lower Cretaceous) zones have already been described. Two of the Upper Cretaceous zones are new. The zones have been subdivided into 20 subzones, 11 of which have been described previously and one of which has been revised/redefined. Nine subzones (Upper Cretaceous) are new. More than 100 stratigraphical events representing more than 70 stratigraphic levels have been recognized and presented in an event-stratigraphic scheme.

scholarly journals Facies changes in the Cenomanian (Cretaceous) of the northwestern Elbe Valley near Dresden (Saxony, Germany)

2017 ◽  
Vol 67 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Karl-Armin Tröger
Keyword(s):  
Upper Cretaceous ◽  
The South ◽  
The West ◽  
The North ◽  
Near Shore ◽  
Bohemian Cretaceous Basin ◽  
Early Late ◽  
Rich Fauna ◽  
Cretaceous Deposits

Abstract The Upper Cretaceous of the Elbe Valley in Saxony and the erosion outliers west of it mark an Upper Cretaceous NW-SE-running strait between the Westsudetic Island in the NE and the Mid-European Island to the west. This street connected the NW-German-Polish Basin in the north and the Bohemian Cretaceous Basin (and adjacent regions of the Tethys) in the south. However, post-Cretaceous erosion north of Meißen removed any Upper Cretaceous deposits but erosion outliers at Siebenlehn and especially north of the Forest of Tharandt proof the presence of a marly through silty belt in this area. Three transgressions (base of uppermost Lower to Middle Cenomanian, base of Upper Cenomanian and base of the geslinianum Zone in the mid-Upper Cenomanian) have taken place. The sedimentation was influenced by the topography of the mentioned islands and by movements at structural lines in the Proterozoic and Palaeozoic basement. During the early Late Cenomanian, a marly-silty sedimentation (Mobschatz Formation) in the north existed besides sandy sedimentation in the south (Oberhäslich Formation). The transgression at the base of the geslinianum Zone caused the final submergence of island chains between Meißen, Dresden and Pirna, and a litho- and biofacies bound to cliffs and submarine swells formed. A silty-marly lithofacies, a mixed sandy-silty lithofacies (Dölzschen Formation) and a sandy lithofacies in the south (Sächsisches Elbsandsteingebirge) co-existed during the latest Cenomanian. The first mentioned biofacies yields a rich fauna mainly consisting of oysters, pectinids, rudists, and near-shore gastropods accompanied by echinids and, in some cliffs, teeth of sharks. The Pennrich fauna (Häntzschel 1933; Uhlig 1941) especially consists of the very common serpulids Pyrgopolon (P.) septemsulcata and Glomerula lombricus (formerly Hepteris septemsulcata and G. gordialis).

scholarly journals On the anomalous magnetic action of hot iron between the white and blood-red heat

1833 ◽  
Vol 2 ◽  
pp. 164-164
Keyword(s):  
Cast Iron ◽  
The South ◽  
Iron And Steel ◽  
The North ◽  
Magnetic Attraction ◽  
Hard Steel ◽  
Malleable Iron ◽  
Magnetic Action ◽  
Cold Iron ◽  
North End

Finding the attractive power of soft malleable iron and steel for a magnet greater than that of cast-iron and hard steel, the author was desirous of ascertaining the effect of heating these bodies in a furnace, so as to render them perfectly soft, upon their magnetic power. With this view the bars were rendered white-hot, and being placed in the direction of the dip, their powers were found nearly equal. It was however found that there was a point between the white heat, at which all magnetic action was lost, and the blood -red heat, at which it was strongest, at which the iron attracted the needle the contrary way to which it did when cold; viz. if the bar and compass were so placed that the north end of the needle was drawn to it when cold, the south end was attracted during the interval above mentioned. The author then proceeds to detail some further experiments in illustration of this anomalous magnetic action, from which it appears that the quantity of magnetic attraction at a red heat is influenced by the height or depth of the centre of the bar from the compass; and as the natural effect of the cold iron was changed by placing the compass below the centre of the bar, it became a question how far the negative attraction was also changed. To decide, the compass was lowered to within six inches of the bottom of the bar, when the cold iron produced a deviation of 21°, by attracting the south end of the needle. At a white heat its power ceased ; but as this subsided to bright red the negative attraction amounted to 101/2°, the north end of the needle being attracted to the iron; it then gradually returned to due north, and ultimately to 70° 30' on the opposite side.

scholarly journals REMARKS ON THE KARSTIFICATION IN THE WIDER AREA OF THE UPPER MESSINIA CLOSED HYDROGEOLOGICAL BASIN (SW PELOPONNESUS, GREECE)

2017 ◽  
Vol 43 (4) ◽  
pp. 1785 ◽  
Author(s):  
I. Mariolakos ◽  
E. Spyridonos
Keyword(s):  
Water Flow ◽  
Upper Cretaceous ◽  
Fault Zones ◽  
Karstic Aquifer ◽  
The South ◽  
Quaternary Deposits ◽  
The North ◽  
Hydraulic Conditions ◽  
Underground Flow ◽  
Hydrogeological System

The Upper Messinia Basin is part of the Kalamata - Kyparissia graben structure, defined by two fault zones, one of E-W direction to the north and one of N-S direction to the east. The Tripolis and the Pindos alpidic units build up the basement of the region, and are covered by post-alpidic Pleistocene and quaternary deposits. The Basin is a closed hydrogeological system. In the upper cretaceous Pindos limestones, we observe two different karst types, according to drilling results. In the western part of the basin, where the limestones appear on the surface, the merokarst type is observed and water flow is limited in separated karstic conduits. On the contrary, in the central part of the basin, where the limestones underlie the clastic post-alpidic formations, the holokarst type is observed and a rich karstic aquifer is developed. This is explained by the closed hydraulic conditions. In the western part of the basin the karstic aquifer is unconfined, while in the central part it is confined, due to the overlying impermeable post-alpidic sediments and the overall closure of underground flow to the south. It appears that the confined conditions led to the development from merokarst to holokarst in this region.

The Auk Field, Block 30/16, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 227-236 ◽  
Author(s):  
Nigel H. Trewin ◽  
Mark G. Bramwell
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Upper Cretaceous ◽  
The South ◽  
Well Control ◽  
Western Margin ◽  
The North ◽  
Fault Block ◽  
Definition Of ◽  
Central North Sea

AbstractThe Auk field is located in Block 30/16 at the western margin of the Central Graben. Oil is contained in a combination stratigraphic and structural trap which is sealed by Cretaceous chalk and Tertiary claystones. An oil column of up to 400 ft is contained within Rotliegend sandstones, Zechstein dolomites, Lower Cretaceous breccia and Upper Cretaceous chalk. Production has taken place since 1975 with 80% coming from the Zechstein, in which the best reservoir lithology is a vuggy fractured dolomite where porosity is entirely secondary due to the dolomitization process and leaching of evaporites. Both Rotliegend dune slipface sandstones, and the Lower Cretaceous breccia comprising porous Zechstein clasts in a sandy matrix, also contribute to production. Poor seismic definition of the reservoir results in reliance on well control for detailed reservoir definition. The field has an estimated ultimate recovery of 93 MMBBL with 13 MMBBL remaining at the end of 1988.The Auk field is situated in Block 30/16 of the Central North Sea about 270 km ESE from Aberdeen in 240-270 ft of water (Fig. 1). The field covers an area of about 65 km2 and is a combination of tilted horst blocks and stratigraphic traps, located at the western margin of the South West Central Graben. The Auk horst is about 20 km long and 6-8 km wide, with a NNW-SSE trend. It is bounded on the west by a series of faults with throws of up to 1000 ft, and the eastern boundary fault has a throw of 5000 ft in the north reducing to zero in the south (Fig. 2). The horst is a westward tilted fault block in the north which grades into a faulted anticline in the south. The Auk accumulation is largely contained within Zechstein dolomites and is ultimately sealed by Cretaceous chalk which overlies the base Cretaceous erosion surface. An E-W cross-section of the field is illustrated by Fig. 3. Auk was the first of the alphabetical sequence of North Sea sea-bird names used for Shell/ Esso fields.

Etude tectonique de la region sud de la Nerthe

1966 ◽  
Vol S7-VIII (5) ◽  
pp. 712-726 ◽  
Author(s):  
Claude Froget ◽  
Gerard Guieu ◽  
Max Robert Roux
Keyword(s):  
Complex Network ◽  
Upper Cretaceous ◽  
Mediterranean Coast ◽  
Prominent Feature ◽  
The South ◽  
The North ◽  
Major Fault ◽  
Tectonic Study ◽  
And Behavior ◽  
Sketch Map

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

A Late Minoan III ‘kitchen’ at Makritikhos (Knossos) (Knossos Survey 90)

1959 ◽  
Vol 53 ◽  
pp. 182-193 ◽  
Author(s):  
Sinclair Hood ◽  
Piet de Jong
Keyword(s):  
Ground Level ◽  
Western Boundary ◽  
The South ◽  
Deep Trench ◽  
The North ◽  
Natural Rock ◽  
High Bank ◽  
Small Room ◽  
North End

In the summer of 1951 N. Dadoudis, while digging a deep trench to bury stones from a plot of land belonging to him on the east edge of Makritikhos village, about 250 metres north of the Palace of Minos, found a complete Minoan amphora (Plan, Fig. 5, no. 3). He reported this discovery to the Ephor of Antiquities for Crete, Dr. N. Platon, who invited Piet de Jong, then the School's Curator at Knossos, to examine the area. Excavation revealed a small room, against the east wall of which the amphora had evidently once stood. The room was cleared by Piet de Jong assisted later by Sinclair Hood. To judge from the character of the vases found in it, the room might have been used as a kitchen.The ground on the edge of Makritikhos village here slopes steeply down through a series of terraces to the bed of the Kairatos stream about 40 metres to the east. The ‘Kitchen’ lay just below a high bank, forming the western boundary of the plot of ground, with the natural rock exposed at the north end and Minoan house walls showing in it to the south. There seems to have been a marked slope down towards the north as well as to the east here in Minoan times. The wall a–a (Fig. 2) at the north end of the original trench dug by Dadoudis, of squared limestone blocks measuring up to about half a metre in length and 0–35 thick, lay at a lower level than the Kitchen, although it appeared to be of the same period with it. A roughly constructed wall b–b south of a–a may have supported a terrace marking this change in ground level. The corner d–d of another, presumably contemporary, house built of squared limestone blocks was exposed in the south part of the original trench.

Sign in / Sign up

Export Citation Format

Share Document