ULVS XVIII: The Quaternary Geomorphology and Calcretes of the Area around Gasr Banat in the Pre-desert of Tripolitania

1987 ◽  
Vol 18 ◽  
pp. 15-27 ◽  
Author(s):  
D. D. Gilbertson ◽  
C. O. Hunt ◽  
D. J. Briggs ◽  
G. M. Coles ◽  
N. M. Thew
Keyword(s):  
Thin Section ◽  
Quaternary Geology ◽  
Archaeological Remains ◽  
The Holocene ◽  
Aeolian Deposits ◽  
Slope Deposits ◽  
Barchan Dunes ◽  
Quaternary Geomorphology ◽  
Surficial Deposits ◽  
Holocene Period

AbstractThis paper describes the Quaternary geology of the area around Gasr Banat which lies near the confluence of the Wadis N'f'd and N'fed in the pre-desert of Tripolitania. The site is of interest because of its aridity, the notable archaeological remains that occur in the region and the opportunity it offered to map the surficial deposits of an area otherwise largely unknown. The survey revealed that two Pleistocene cobble and gravel units laid down by ‘torrential’ rivers could be distinguished: the older of which had been cemented by calcrete. Polyphase slope deposits occur. Thin section studies of the calcrete suggests it is possible to recognise two arid and two humid episodes from its micromorphology.The Holocene period is represented by water-lain and aeolian deposits on the wadi floodplain, and climbing and barchan dunes on the adjacent hills. The period immediately prior to the construction of major cross wadi barrages may have been characterised by larger or more frequent floods than occurred immediately prior to the 1984 survey; the palaeoclimatic significance of this observation is unclear. One major barrage in the area is shown to have been built on substantial earth foundations. The assumed Romano-Libyan date of these barrages still remains to be proven, but, conversely, it is now demonstrated that they were not constructed or reconstructed in the 1950s.

Sources of organic carbon and depositional environment in the Bengal delta plain sediments during the Holocene period

Limnology ◽  
2009 ◽  
Vol 11 (2) ◽  
pp. 133-142 ◽  
Author(s):  
Hossain M. Anawar ◽  
Takahito Yoshioka ◽  
Eiichi Konohira ◽  
Junji Akai ◽  
M. C. Freitas ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Depositional Environment ◽  
The Holocene ◽  
Bengal Delta ◽  
Delta Plain ◽  
Holocene Period

scholarly journals Geomorphological reconnaissance of the Psathopyrgos and Rion-Patras Fault zones (Achaia, NW Peloponnesus).

2007 ◽  
Vol 40 (4) ◽  
pp. 1586 ◽  
Author(s):  
N. Palyvos ◽  
D. Pantosti ◽  
L. Stamatopoulos ◽  
P. M. De Martini
Keyword(s):  
Fault Zone ◽  
Fault Zones ◽  
Fault Slip ◽  
Geological Data ◽  
Slip Rates ◽  
The Holocene ◽  
Fault Slip Rates ◽  
Earthquake Ruptures ◽  
Surficial Deposits

In this communication we discuss reconnaissance geomorphological observations along the active Psathopyrgos and Rion-Patras (NE part) fault zones. These fault zones correspond to more or less complex rangefronts, the geomorphic characteristics of which provide hints on the details of the fault zone geometries, adding to the existing geological data in the bibliography. Aiming at the identification of locations suitable or potentially suitable for geomorphological and geological studies for the determination of fault slip rates in the Holocene, we describe cases of faulted Holocene landforms and associated surficial deposits. We also discuss problems involved in finding locations suitable for geological (paleoseismological) studies for the determination of the timing of recent earthquake ruptures, problems due to both man-made and natural causes.

Holocene climate variability and Indian Summer Monsoon: An overview

The Holocene ◽  
2020 ◽  
Vol 30 (5) ◽  
pp. 744-773 ◽  
Author(s):  
Upasana S Banerji ◽  
P Arulbalaji ◽  
D Padmalal
Keyword(s):  
Indian Ocean ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Indian Subcontinent ◽  
Ice Age ◽  
Interglacial Period ◽  
Northern Indian Ocean ◽  
The Holocene ◽  
Indian Landmass ◽  
Holocene Period

The response of the Indian Summer Monsoon (ISM) to forcing factors and climate variables has not yet fully explored, even though the ISM plays a pivotal role in the socio-economics of the Indian subcontinent and nearby areas. The ISM progression over Indian landmass is a manifestation of the Intertropical Convergence Zone (ITCZ) migration over the northern Indian Ocean and the Indian subcontinent. The recent anomalous behaviour of ISM raises the need for a better understanding of its spatio-temporal changes during the ongoing interglacial period termed as the Holocene period. The Holocene period has been classified further based on the globally observed abrupt climatic events at 8.2 and 4.2 ka. The 8.2 ka global cooling events have been recorded from northern Indian Ocean marine archives but limited records from the continental archives of the Indian landmass has demonstrated the 8.2 ka event. At the same time, the 4.2 ka dry climate has been endorsed by both marine as well as continental records and agrees with the global studies. During the ‘Little Ice Age’ (LIA), in the India subcontinent, wet conditions prevailed in the northern, central and western regions while a dry climate existed over the greater part of peninsular India. The present review offers an account of ISM signatures and possible mechanisms associated with the monsoon variability in the Indian subcontinent and the northern Indian Ocean during the Holocene period.

scholarly journals Ounjougou (Mali): A history of holocene settlement at the southern edge of the Sahara

Antiquity ◽  
2004 ◽  
Vol 78 (301) ◽  
pp. 579-593 ◽  
Author(s):  
E. Huysecom ◽  
S. Ozainne ◽  
F. Raeli ◽  
A. Ballouche ◽  
M. Rasse ◽  
...  
Keyword(s):  
West African ◽  
Sahara Desert ◽  
The South ◽  
Human Occupation ◽  
Upper Pleistocene ◽  
The Holocene ◽  
Environmental Sequence ◽  
History Of ◽  
Holocene Period

The area of Ounjougou consists of a series of gullies cut through Upper Pleistocene and Holocene formations on the Dogon Plateau in the Sahel at the south edge of the Sahara Desert. Here the authors have chronicled a stratified sequence of human occupation from the tenth to the second millennium BC, recording natural and anthropogenic strata containing artefacts and micro- and macro- palaeoecological remains, mostly in an excellent state of preservation. They present a first synthesis of the archaeological and environmental sequence for the Holocene period, define five main occupation phases for Ounjougou, and attempt to place them within the context of West African prehistory.

scholarly journals As unidades pliocénicas e quaternárias no espaço do Baixo Mondego (uma perspectiva de ordem)

1999 ◽  
pp. 7-17 ◽  
Author(s):  
António Ferreira Soares
Keyword(s):  
Middle Pleistocene ◽  
Archaeological Remains ◽  
Quaternary Deposits ◽  
Upper Pleistocene ◽  
The Holocene ◽  
Espírito Santo ◽  
Lower Pleistocene ◽  
Espirito Santo

Pliocene and Quaternary Units in the Lower Mondego (Portugal) — The analysis of the relations betweenthe quaternary deposits in the Baixo Mondego, as well as their individualisation from others considered asPliocene, still suffer from insufficient reference marks necessary to guarantee equivalencies. The limitis now considered to be in the concert of the Cruz de Morouços Complex, where the Antanhol Formation(= Barracão Group, Upper Pliocene) and the Espírito Santo Conglomerate, equivalent to the GordosConglomerate (Lower Pleistocene), succeed to each other. From the Pleistocene assemblage andbeside the deposits directly associated to the evolution of Mondego (Ameal-Santo Varão and Tentugal-Gabrielos deposits), the deposits revealing upper littoral environments stand out, as the ArazedeSandstone, the Quiaios Sandstone, others deposits directly related with the Cabo Mondego morphogenesis,the Farol Deposits, fossiliferous and possibly from the Lower to Middle Pleistocene and theMurtinheira Deposits from the Upper Pleistocene. In turn the Condeixa Tuffs, with an accommodationspace of 24 Km2 , show an ordered succession of facies (Conglomerates — Cg; yellow mud — Pa, tuffs— Ta and Tc; grey mud with Lymnea — Pc) and an extended age from the Pleistocene (with Elephasantiquus and Hippopotamus incognitus in the base) possibly around the 400 Ka, to the Holocene (faciesPc with roman archaeological remains).

Investigating aeolian deposits in Hamun Lake located in east of Iran during Holocene period

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Samad Fotoohi ◽  
Hossein Negaresh ◽  
Javad Darvishi Khatooni ◽  
Maqsoud Bayat
Keyword(s):  
Aeolian Deposits ◽  
East Of Iran ◽  
Holocene Period

scholarly journals Nara Inlet 1: a Holocene sequence from the Whitsunday Islands, central Queensland coast

1989 ◽  
Vol 6 ◽  
pp. 53-76 ◽  
Author(s):  
Bryce Barker
Keyword(s):  
Archaeological Excavation ◽  
The Holocene ◽  
Holocene Period

This paper reports an archaeological excavation at Nara Inlet, Hook Island, one of the Whitsunday group off the central Queensland coast. The site, Nara Inlet 1, is a large rockshelter which returned a non-basal 14C date of 8150±80 bp. The excavation forms part of a wider study investigating prehistoric island use by Aborigines of the Whitsunday region as well as archaeological change in the Holocene Period.

scholarly journals Indícios de Variações Climáticas Neo-quaternárias no Médio Vale do Rio Doce

1977 ◽  
Vol 1 ◽  
pp. 110-113
Author(s):  
Maria Regina Mousinho de Meis
Keyword(s):  
Lake Level ◽  
Lake Area ◽  
The Holocene ◽  
Slope Deposits ◽  
Hydrologic Budget ◽  
Lake Waters

A tentative stratigraphy for the Upper Quaternary events in the Jacare lake area, middle rio Doce basin, was obtained through the analysis of borehole samples. The deposition of a thick sequence os slope deposits was interrupted at the beginning of the Holocene (9.840 220 years B.P.) by a transgression of the lake waters. This submersion is thought to be contemporaneous to the expansion of the rainforest over the area. More recent fluctuations of the lake level seem to denounce variations in the hydrologic budget.

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