Variability of the transgressive stacking pattern under environmental changes control: Example from the Post-Glacial deposits of the Gulf of Lions inner-shelf, Mediterranean, France

2008 ◽  
Vol 28 (9) ◽  
pp. 1138-1152 ◽  
Author(s):  
Caroline Labaune ◽  
Michel Tesson ◽  
Bernard Gensous
Keyword(s):  
Environmental Changes ◽  
Inner Shelf ◽  
Glacial Deposits ◽  
Gulf Of Lions ◽  
Stacking Pattern ◽  
Mediterranean France

scholarly journals Holocene climate variability in the North-Western Mediterranean Sea (Gulf of Lions)

2016 ◽  
Vol 12 (1) ◽  
pp. 91-101 ◽  
Author(s):  
B. Jalali ◽  
M.-A. Sicre ◽  
M.-A. Bassetti ◽  
N. Kallel
Keyword(s):  
Mediterranean Sea ◽  
Western Mediterranean ◽  
Early Holocene ◽  
Inner Shelf ◽  
Catchment Basin ◽  
Rhône River ◽  
Gulf Of Lions ◽  
The North ◽  
Western Mediterranean Sea ◽  
Rhone River

Abstract. Sea surface temperatures (SSTs) and land-derived input time series were generated from the Gulf of Lions inner-shelf sediments (NW Mediterranean Sea) using alkenones and high-molecular-weight odd-carbon numbered n-alkanes (TERR-alkanes), respectively. The SST record depicts three main phases: a warm Early Holocene ( ∼  18 ± 0.4  °C) followed by a cooling of  ∼  3  °C between 7000 and 1000 BP, and rapid warming from  ∼  1850 AD onwards. Several superimposed multi-decadal to centennial-scale cold events of  ∼  1  °C amplitude were also identified. TERR-alkanes were quantified in the same sedimentary horizons to identify periods of high Rhone River discharge and compare them with regional flood reconstructions. Concentrations show a broad increase from the Early Holocene towards the present with a pronounced minimum around 2500 BP and large fluctuations during the Late Holocene. Comparison with Holocene flood activity reconstructions across the Alps region suggests that sediments of the inner shelf originate mainly from the Upper Rhone River catchment basin and that they are primarily delivered during positive North Atlantic Oscillation (NAO).

Ichnology of the Trenton Group in the Quebec City area

1979 ◽  
Vol 16 (10) ◽  
pp. 2022-2039 ◽  
Author(s):  
R. K. Plckerill ◽  
W. H. Forbes
Keyword(s):  
Environmental Changes ◽  
Temporal Distribution ◽  
Trace Fossil ◽  
Energy Conditions ◽  
Quebec City ◽  
Inner Shelf ◽  
Middle Ordovician ◽  
City Area ◽  
Substrate Stability ◽  
Trenton Group

Marine limestones of the Middle Ordovician (Caradocian) Trenton Group in the Quebec City area are extensively burrowed. Traces referable to Anconichnus horizontalis, cf. Biformites, Bifungites cf. halli, Chondrites, Cruziana cf. pudica, Cruziana, Isopodichnus, Palaeophycus, Planolites, ? Rhizocorallium cf. R. irregulare, Rusophycus, Teichichnus cf. rectus, Tomaculum and Trichichnus are described in detail. Miscellaneous traces, those not morphologically distinct and (or) sufficiently abundant to warrant formal taxonomic treatment, are briefly described. The trace fossil assemblage can be broadly equated with the Cruziana ichnofacies. Southwest of Quebec City the Trenton Group was deposited in a gradually deepening offshore bar to shallow inner shelf situation, whereas to the northeast deposition occurred in a shallow inner shelf to deeper outer shelf – upper slope environment. The spatial and temporal distribution and abundance of the trace fossils are examined in relation to these broad environmental changes. The observed patterns are perhaps best related to variation in energy conditions, substrate stability, and food availability, parameters all broadly related to water depth. The trace fossil density and diversity patterns are analogous to those exhibited by modem and ancient shelly macrobenthos, where in shallow subtidal regimes they are low, then peak in slightly deeper subtidal situations, and gradually decrease seawards with increasing depth and distance from shore.

scholarly journals Erosional processes and paleo-environmental changes in the Western Gulf of Lions (SW France) during the Messinian Salinity Crisis

2005 ◽  
Vol 217 (1-2) ◽  
pp. 1-30 ◽  
Author(s):  
Johanna Lofi ◽  
Christian Gorini ◽  
Serge Berné ◽  
Georges Clauzon ◽  
A. Tadeu Dos Reis ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Messinian Salinity Crisis ◽  
Gulf Of Lions ◽  
Sw France

scholarly journals Danish Finds of Mammoth (Mammuthus primigenius (Blumenbach)) Stratigraphical position, dating and evidence of Late Pleistocene environment

1990 ◽  
Vol 14 ◽  
pp. 1-44
Author(s):  
Kim Aaris-Sørensen ◽  
Kaj Strand Petersen ◽  
Henrik Tauber
Keyword(s):  
Late Pleistocene ◽  
Environmental Changes ◽  
Faunal Remains ◽  
Mammuthus Primigenius ◽  
Glacial Deposits ◽  
Maximum Expansion ◽  
Important Stage ◽  
Skeletal Material ◽  
Ice Retreat ◽  
Bone Fragments

A catalogue of all known remains of mammoth in Denmark is presented, comprising 125 finds. Half of the mammoth material is molars, which are morphologically referred to Mammuthus primigenius (Blumenbach), a third is tusk, and the rest is bone fragments. 14 specimens of mammoth have been C-14 dated. 13 samples have ages from older than 40 000 to ca 21500 C-14 years B.P., and one sample gave an age of ca 13200 C-14 years B.P. As the skeletal material is redeposited, these dates at the same time give maximum ages of the glacial deposits in which they are found. On the basis of this evidence the glacial development during the Weichselian is reviewed. An ice-free period from before 45000 B.P. to around 20 000 years B.P. is indicated. A mammoth tusk from the Tirstrup sandur on Djursland, dated to 13240 +760/-690 B.P., marks an important stage in the ice retreat in Denmark, and shows that the mammoth re-immigrates after the maximum expansion of the Weichselian ice. Remains of other Late Pleistocene vertebrates are also mentioned. On the basis of floral and faunal remains the environmental changes during the Late Pleistocene are then reconstructed. The ice-free period in the Middle Weichselian was characterized by a steppe biome, which may appropriately be termed the mammoth steppe. This Weichselian environment seems to be incomparable to any environment known today.

scholarly journals Holocene climate variability in the North-Western Mediterranean Sea (Gulf of Lions)

2015 ◽  
Vol 11 (4) ◽  
pp. 3187-3209 ◽  
Author(s):  
B. Jalali ◽  
M.-A. Sicre ◽  
M.-A. Bassetti ◽  
N. Kallel
Keyword(s):  
Mediterranean Sea ◽  
Western Mediterranean ◽  
Early Holocene ◽  
Inner Shelf ◽  
Catchment Basin ◽  
Rhône River ◽  
Gulf Of Lions ◽  
The North ◽  
Western Mediterranean Sea ◽  
Rhone River

Abstract. Sea surface temperatures (SSTs) and land-derived input time series were generated from the Gulf of Lions inner-shelf sediments (NW Mediterranean Sea) using alkenones and high-molecular-weight odd-carbon numbered n-alkanes (TERR-alkanes), respectively. The SST record depicts three main phases: a warm Early Holocene (∼ 18 ± 0.4 °C) followed by a cooling of ∼ 3 °C (from 7000 to 1000 BP) and rapid warming from ∼ 1850 AD onwards. Several superimposed multi-decadal cooling events of ∼ 1 °C amplitude were also identified. TERR-alkanes were also quantified to identify periods of high river discharge in relation with flood events of the Rhone River and precipitations. Their concentrations show a broad increase from the early Holocene towards present with a pronounced minimum around 2500 BP and large fluctuations during the second part of the Holocene. Comparison with Holocene flood activity reconstructions across the Alps region suggests that sediments of the inner shelf originate mainly from the Upper Rhone River catchment basin and that they are primarily delivered during positive NAO.

Sediment dynamics during wet and dry storm events on the Têt inner shelf (SW Gulf of Lions)

2006 ◽  
Vol 234 (1-4) ◽  
pp. 129-142 ◽  
Author(s):  
J. Guillén ◽  
F. Bourrin ◽  
A. Palanques ◽  
X. Durrieu de Madron ◽  
P. Puig ◽  
...  
Keyword(s):  
Sediment Dynamics ◽  
Storm Events ◽  
Inner Shelf ◽  
Gulf Of Lions

Source-to-sink and evolutionary processes of the East China Sea inner-shelf mud belt and its response to environmental changes since the Holocene: New evidence from the distal mud belt

The Holocene ◽  
2021 ◽  
pp. 095968362110032
Author(s):  
Jingyi Cong ◽  
Gang Hu ◽  
Tara N Jonell ◽  
Yong Zhang ◽  
Yuting Li ◽  
...  
Keyword(s):  
East China Sea ◽  
Yangtze River ◽  
Environmental Changes ◽  
Sediment Supply ◽  
East China ◽  
The Yangtze River ◽  
The East China Sea ◽  
Inner Shelf ◽  
The Holocene ◽  
China Sea

During the past decades, the elongated mud belt, 1000 km length, in the inner shelf of the East China Sea (ECS), has been extensively studied. Previous studies mainly focused on the northern part of the mud belt. There are still many arguments on various issues of the mud belt, including the provenance discrimination, the formation mechanism, and its evolution response to climate and environmental changes. In this paper, a borehole acquired from the distal southern mud belt which penetrated the Holocene strata with the collected data was analyzed. According to the parameters of (La/Sm)UCC versus (Gd/Yb)UCC and the ternary diagram of smectite-illite-(kaolinite + chlorite), sediments from the top section of Core ECS1601 originated from the Yangtze River since 13.7 ka. Sediments from upper and lower reaches of the Yangtze River can be clearly distinguished by (Gd/Yb)UCC value. The provenance of the distal mud belt shifted from upper reaches to lower valley since 5 ka and returned to the upper reaches again since 2.5 ka, which was related to the asynchronous evolution of Asian monsoon system and anthropogenic activities. The high sedimentation rates occurring in the distal mud belt between 5 and 2.5 ka were related to the decreased sediment supply of the upper reaches and the strengthened Zhejiang-Fujian Coastal Current (ZFCC) caused by the intensified East Asian Winter Monsoon (EAWM).

Linking transcription, RNA polymerase II elongation and alternative splicing

2020 ◽  
Vol 477 (16) ◽  
pp. 3091-3104 ◽  
Author(s):  
Luciana E. Giono ◽  
Alberto R. Kornblihtt
Keyword(s):  
Gene Expression ◽  
Alternative Splicing ◽  
Rna Polymerase Ii ◽  
Environmental Changes ◽  
Transcription Elongation ◽  
Single Gene ◽  
Regulation Of Gene Expression ◽  
Regulation Of Transcription ◽  
Stepping Stones ◽  
Eukaryotic Transcription

Gene expression is an intricately regulated process that is at the basis of cell differentiation, the maintenance of cell identity and the cellular responses to environmental changes. Alternative splicing, the process by which multiple functionally distinct transcripts are generated from a single gene, is one of the main mechanisms that contribute to expand the coding capacity of genomes and help explain the level of complexity achieved by higher organisms. Eukaryotic transcription is subject to multiple layers of regulation both intrinsic — such as promoter structure — and dynamic, allowing the cell to respond to internal and external signals. Similarly, alternative splicing choices are affected by all of these aspects, mainly through the regulation of transcription elongation, making it a regulatory knob on a par with the regulation of gene expression levels. This review aims to recapitulate some of the history and stepping-stones that led to the paradigms held today about transcription and splicing regulation, with major focus on transcription elongation and its effect on alternative splicing.

Sign in / Sign up

Export Citation Format

Share Document