Contribution a l'etude geologique des Prealpes carniques orientales (Alpes meridionales, province d'Udine, Italie)

1963 ◽  
Vol S7-V (5) ◽  
pp. 809-820 ◽  
Author(s):  
Michel Cousin
Keyword(s):  
Deep Water ◽  
Upper Cretaceous ◽  
Sedimentary Sequence ◽  
Reef Facies ◽  
Lower Eocene ◽  
Upper Miocene ◽  
Julian Alps

Abstract A lower Liassic to upper Miocene sedimentary sequence, west of Tagliamento, marks a transition from the reef facies of the Friuli zone to the deep water sediments of the Julian Alps. Three distinct tectonic regions can be separated by their stratigraphy: the Pradis-Forgaria autochthon of upper Cretaceous rudistid limestone and lower Eocene flysch underlying Oligocene marls and Miocene molasse; an inclined fold in the Pala-Prat-Pedroc area consisting of Norian to Paleocene fossiliferous limestones; and the Corno-Covria unit. The major tectonics are considered to be post-Pontian.

scholarly journals Araçatuba Formation: palustrine deposits from the initial sedimentation phase of the Bauru Basin

2003 ◽  
Vol 75 (2) ◽  
pp. 173-187 ◽  
Author(s):  
Luiz A. Fernandes ◽  
Paulo C. F. Giannini ◽  
Ana Maria Góes
Keyword(s):  
Upper Cretaceous ◽  
Drainage System ◽  
Arid Climate ◽  
Sedimentary Sequence ◽  
Aeolian Sand ◽  
Desiccation Cracks ◽  
Aeolian Deposits ◽  
Saline Waters ◽  
Semi Arid

The Bauru Basin (Upper Cretaceous) accumulated an essentially sandy continental sedimentary sequence. In a first desertic phase the basaltic substratum was covered by a widespread and homogeneous aeolian sand unit with minor loess intercalations. The substratum relief favored the formation of an endorheic drainage system under semi-arid climate, a process that started the development of the Araçatuba Paleoswamp. The palustrine deposits (Araçatuba Formation) comprise siltstone and tipically greenish gray narrow tabular strata of sandstone cemented by carbonate. Moulds and gypsite and dolomite pseudomorphs were identified. The moulds seem to be genetically associated with desiccation cracks, root marks and climbing ripple lamination levels, that, on the whole, indicate calm shallow saline waters undergoing phases of subaerial exposition. At the boundaries of the study area, sand units may exhibit sigmoidal features and convolute bedding structure, which is characteristic of marginal deltaic deposits. The Araçatuba Formation is enclosed in and later overlaid by the aeolian deposits of the Vale do Rio do Peixe Formation.

scholarly journals High-frequency sea-level changes recorded in deep-water carbonates of the Upper Cretaceous Dol Formation (island of Brač, Croatia)

2010 ◽  
Vol 61 (1) ◽  
pp. 29-38
Author(s):  
Damir Bucković ◽  
Maja Martinuš ◽  
Duje Kukoč ◽  
Blanka Tešović ◽  
Ivan Gušić
Keyword(s):  
Sea Level ◽  
Deep Water ◽  
High Frequency ◽  
Upper Cretaceous ◽  
Distal Part ◽  
Preferential Orientation ◽  
Sea Level Changes ◽  
Carbonate Production ◽  
Fine Grained ◽  
Platform Margin

High-frequency sea-level changes recorded in deep-water carbonates of the Upper Cretaceous Dol Formation (island of Brač, Croatia)The upper part of the Middle Coniacian/Santonian-Middle Campanian deep-water Dol Formation of the island of Brač is composed of countless fine-grained allodapic intercalations deposited in an intraplatform trough. Within the studied section 13 beds can be distinguished, each defined by its lower part built up of dark grey limestone with abundance of branched, horizontally to subhorizontally oriented burrows, and the upper part, in which the light grey to white limestone contains larger burrows, rarely branched, showing no preferential orientation. The lower, dark grey, intensively bioturbated levels are interpreted as intervals formed during high-frequency sea-level highstands, while the upper, light grey-to-white levels are interpreted as intervals formed during the high-frequency sea-level lowstands. Cyclic alternation of these two intervals within the fine-grained allodapic beds is interpreted as the interaction between the amount of carbonate production on the platform margin and the periodicity and intensity of shedding and deposition in the distal part of toe-of-slope environment, which is governed by Milankovitch-band high frequency sea-level changes.

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.

scholarly journals The Middle Cenomanian basal series of Planinica, Western Serbia

2002 ◽  
pp. 13-43 ◽  
Author(s):  
Dragoman Rabrenovic ◽  
Nebojsa Vasic ◽  
Jovanka Mitrovic-Petrovic ◽  
Vladan Radulovic ◽  
Barbara Radulovic ◽  
...  
Keyword(s):  
New Taxa ◽  
Upper Cretaceous ◽  
Sedimentary Rocks ◽  
Structural Features ◽  
Upper Miocene ◽  
Fine Grained ◽  
The Village ◽  
Marly Limestone

Sedimentary rocks of the Upper Cretaceous basal series found at the village of Planinica, Western Serbia, are composed of thick coarse clastics and beds and intercalations of medium- to fine-grained clastics. The series lies transgressively over Jurassic serpentinite and peridotite, and under Upper Miocene marlstone and marly limestone. Sedimentary, petrographic, paleontological, and biostratigraphic characteristics of the basal series are described and its lithological members and their structural features are identified. From medium-grained sandy matrix in thick coarse clastics, two ammonite taxa, four brachiopod taxa (including the new taxa Orbirhynchia oweni and "Terebratula" n. gen. et sp.), and eleven echinoid taxa are described. The brachiopod species Kingena concinna Owen is used in dating the basal series as Middle Cenomanian, whereas limestone fragments in coarse clastics correspond to the Late Albian and Early Cenomanian.

scholarly journals Triassic deep-water sedimentation in the Bled Basin, eastern Julian Alps, Slovenia

Geologija ◽  
2019 ◽  
Vol 62 (2) ◽  
pp. 153-173 ◽  
Author(s):  
Luka Gale ◽  
Tea Kolar-Jurkovšek ◽  
Barbara Karničnik ◽  
Bogomir Celarc ◽  
Špela Goričan ◽  
...  
Keyword(s):  
Deep Water ◽  
Julian Alps

scholarly journals Constraining sub-seismic deep-water stratal elements with electrofacies analysis; A case study from the Upper Cretaceous of the Måløy Slope, offshore Norway

2015 ◽  
Vol 59 ◽  
pp. 268-285 ◽  
Author(s):  
Amandine Prélat ◽  
David M. Hodgson ◽  
Mark Hall ◽  
Christopher A.-L. Jackson ◽  
Carol Baunack ◽  
...  
Keyword(s):  
Deep Water ◽  
Upper Cretaceous

New sedimentological, bio-magnetostratigraphic and palynologic data on the Upper Cretaceous of “Alan-Kyr” (Central Crimea)

2019 ◽  
pp. 24-34
Author(s):  
A. Yu. Guzhikov ◽  
G. N. Aleksandrova ◽  
E. Yu. Baraboshkin
Keyword(s):  
Deep Water ◽  
Upper Cretaceous ◽  
Reverse Polarity ◽  
Lower Border ◽  
Significant Divergence ◽  
Water Genesis ◽  
Central Crimea

In this article there are the results of sedimentological, palynological and paleomagnetic studies of upper Cretaceous in Alan-Kyr section (Central Crimea). The nomenclature of rocks was specified, and their deep-water genesis was justified. According to palynologic data, the age of sediments is estimated as late Campanian, in the lower part of the section palynomorphs were not found. In the lower part of the section there was established a reverse polarity magnetozone — probable analogue of C33r magnetic chron, which base should be desirable to use as a primary attribute to determine the lower border of Campanian stage in the section according to Wolfring’s recommendation [Wolfgring et al., 2018]. The received data found a significant divergence microfaunistic dating of the section, conducted before [Bragina et al., 2016].

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.

Sign in / Sign up

Export Citation Format

Share Document