The Upper Cretaceous-Lower Eocene carbonate platforms of the Mateur-Beja area (NW of Tunisia): A pattern of isolated platform

2022 ◽  
pp. 104453
Author(s):  
Fehmy Belghouthi
Keyword(s):  
Upper Cretaceous ◽  
Carbonate Platforms ◽  
Lower Eocene

scholarly journals Speleogenesis and depositional hystory of paleokarst phreatic caves/cavities; Podgrad, SW Slovenia

2021 ◽  
Author(s):  
Bojan Otoničar
Keyword(s):  
Host Rock ◽  
Upper Cretaceous ◽  
Coarse Grained ◽  
Mixing Zone ◽  
Carbonate Sediment ◽  
Lower Eocene ◽  
The Third ◽  
Cave Sediments ◽  
Upper Paleocene ◽  
Δ13c And Δ18o

The studied palaeokarst corresponds to an uplifted peripheral foreland bulge when Upper Cretaceous diagenetically immature eugenetic carbonates were subaerially exposed, karstified and subsequently overlain by upper Paleocene/lower Eocene palustrine limestone. Among the subsurface paleokarstic features, both vadose and phreatic forms occur.  The phreatic caves/cavities include features characteristic of the mixing zone speleogenesis at the interface between freshwater (brackish water) lenses and the underlying seawater. They were found in various positions with respect to the paleokarstic surface, the deepest being about 75 m below the surface. Three indistinct horizons of cavities/caves and intermediate vugs were recognized. Subsequently, all cavities were completely filled with detrital sediments and speleothems in the phreatic and vadose zones. In general, the phreatic cavities of the lower two horizons are geopetally filled with mudstone derived from incomplete dissolution of the host rock and overlain by coarse-grained, blocky calcite. Shallower below the paleokarst surface, a large phreatic cave of the third horizon is filled with flowstone overlain by reddish micritic carbonate sediment with intercalated calcite rafts. In the upper part of the cave, sediments derived from the paleokarst surface are gradually becoming more abundant. Vadose channels, which may also intersect the cave sediments, are mainly filled with "pedogenic" material derived from the paleokarst surface. Immediately prior to marine transgression over the paleokarst surface, some cavities were filled with marine-derived microturbidites. In general, the diversity of cave fills and the amount of surface material decrease with distance from the paleokarst surface. Below the paleokarst surface, the δ13C and δ18O values of a host rock and cavity deposits show good correlation with trends significant for meteoric diagenesis. It is shown that deposits associated with phreatic caves can be of great importance for the study of the speleogenetic, geomorphological and hydrogeological evolution of certain palaeokarst regions.

Sur la datation des breches de la montagne Sainte-Victoire pres d'Aix-en-Provence

1964 ◽  
Vol S7-VI (1) ◽  
pp. 127-133
Author(s):  
Fernand Touraine
Keyword(s):  
Upper Cretaceous ◽  
Lower Eocene ◽  
Stratigraphic Position ◽  
Dinosaur Eggs

Abstract Breccias in Sainte-Victoire mountain have been considered upper Cretaceous because of their stratigraphic position and the presence of dinosaur eggs. Other nearby breccias are considered Montian (lower Eocene). The supposed upper Cretaceous breccias are displaced from the principal masses by faulting but are the same Montian formation and age.

Tectono-sedimentary evolution of a fore-chain domain : example of the Habt and Sidi Mrayt basins, northwestern external Moroccan Rif ; stratigraphic precisions and tectonic modelling

2004 ◽  
Vol 175 (4) ◽  
pp. 383-397 ◽  
Author(s):  
Abdelali Zakir ◽  
Ahmed Chalouan ◽  
Hugues Feinberg
Keyword(s):  
Upper Cretaceous ◽  
Middle Miocene ◽  
Middle Eocene ◽  
Fault Propagation ◽  
Lower Eocene ◽  
Structural Trend ◽  
Sedimentary Evolution ◽  
Structural Relationships ◽  
Regional Tectonic ◽  
Ridge Structures

Abstract In this paper, a tecto-sedimentary evolution model of the northwestern external Rif zones (Morocco) is proposed. It is based on the study of structural relationships and the biostratigraphic and sedimentologic analysis of different Tertiary syn-tectonic units. This zone shows alternating foredeep basins and anticlinal ramps with a NNW-SSE structural trend and a vergence toward the WSW. The trend of turbiditic bodies and palaeocurrent directions (from the SSE to the NNW) are parallel to the regional tectonic strike. Sidi Mrayt and El Habt basins are filled with syn-tectonic middle Eocene to middle Miocene sediments; The Habt basin is subdivided in two sub-basins: Asilah-Larache and Rirha-Gzoula. The deposits are distributed in two separated turbiditic complex, each one including a stacking of turbiditic systems. The Rirha-Gzoula and Asilah-Larache sub-basins are located in front of two anticline ridge structures made up of Upper Cretaceous and Lower Eocene material; they are respectively Boujediane and Arbaa Ayacha anticlines. The distribution of turbiditic bodies, unconformities and structural relationships within the thrusts and folds system in the northwestern external Rif indicate the progression toward the external zones of fault-propagation folds and associated basins.

Paleocene-Lower Eocene carbonate platforms of westernmost Tethys

2020 ◽  
Vol 404 ◽  
pp. 105674 ◽  
Author(s):  
Manuel Martín-Martín ◽  
Francesco Guerrera ◽  
Josep Tosquella ◽  
Mario Tramontana
Keyword(s):  
Carbonate Platforms ◽  
Lower Eocene

scholarly journals Identification of the African–European <i>Erymnochelys</i> group (Pleurodira, Podocnemididae) in the Belgian fossil record: first finding of <i>Eocenochelus eremberti</i> outside its type locality

Fossil Record ◽  
2017 ◽  
Vol 20 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Adán Pérez-García ◽  
Thierry Smith
Keyword(s):  
Fossil Record ◽  
Upper Cretaceous ◽  
Middle Eocene ◽  
Type Locality ◽  
Specific Level ◽  
Lower Eocene ◽  
Its Analysis ◽  
First Finding ◽  
French Region ◽  
Sciences Naturelles

Abstract. An almost complete plastron, as well as several peripherals and a costal plate of a turtle from the middle Eocene of Saint-Gilles, is presented here. Although this turtle specimen was donated to the Institut royal des Sciences naturelles de Belgique (Brussels, Belgium) more than a century ago, it remained undescribed. Its study allows us to recognize the second pleurodiran in the Belgian fossil record, where, until now, the Eocene Neochelys was the only one known. The Belgian material of Neochelys is known in lower Eocene (early Ypresian) levels, but the new pleurodiran specimen comes from the middle Eocene (early Lutetian). It is the first partial articulate shell of a pleurodiran turtle recognized in Belgium, and the only member of this clade recognized in this country at specific level. The new specimen is a representative of the so-called Erymnochelys group, this lineage being known in Africa from the Upper Cretaceous to the present but in Europe only during the Eocene. It represents the first specimen of Eocenochelus eremberti identified outside its type locality, the French region of Saint-Germain-en-Laye (Yvelines, Île-de-France), where only one specimen was found. The plastron of the Belgian individual corresponds to the most complete for this species. Its analysis allows us not only to broaden the range of paleobiogeographical distribution of Eocenochelus eremberti but also to improve the knowledge about the anatomy and variability of this taxon.

Stratigraphie du Cretace superieur et de l'Eocene inferieur dans la Chalosse de Montfort (Landes)

1946 ◽  
Vol S5-XVI (4-6) ◽  
pp. 385-397
Author(s):  
J. Cuvillier ◽  
J. Dupouy-Camet
Keyword(s):  
Special Reference ◽  
Upper Cretaceous ◽  
Stratigraphic Sequence ◽  
Depositional History ◽  
Lower Eocene ◽  
History Of ◽  
Vertical Variations

Abstract An account of the stratigraphic sequence and depositional history of upper Cretaceous and lower Eocene deposits of the Chalosse de Montfort area, Landes, France, with special reference to the lateral and vertical variations of facies of the lower Eocene strata.

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