نتایج جستجو برای: lowstand

تعداد نتایج: 110  

1998
Robert M. Carter Tim R. Naish

Wanganui Basin, New Zealand, contains one of the most complete late Neogene marine stratigraphic records in the world. The ca. 2 km thick basin-fill for the last ca. 2.5 Ma comprises 47 superposed cyclothems which correspond to successive 5th (100 ka) and 6th (41 ka) order glacio-eustatic, sea-level fluctuations on the palaeo-New Zealand shelf since oxygen isotope stage 100. Stages 100 to 5 are...

2008
S. J. Kao M. H. Dai K. Y. Wei N. E. Blair W. B. Lyons

[1] Significantly older C ages by 2500–7900 years are found for sedimentary total organic carbon (TOC) when compared to ages of codeposited surface-dwelling foraminifera in the southern Okinawa Trough. This age discrepancy increases with rising sea level since the Last Glacial Maximum. A progressive shift in TOC dC toward more negative values with rising sea level reflects an increasing fractio...

1996
J. M. Molina P. A. Ruiz - Ortiz J. A.

Calcareous tempestite levels interbedded with Ammonitico Rosso and other related pelagic facies have been recognized. The previously described examples of calcareous tempestites in pelagic facies are scarce. The studied outcrops are Middle and Late Jurassic in age and correspond to ancient sediments in the Southern Iberian Continental Paleomargin. These outcrops are now included in a notably de...

2006
Frank B. Evans Kenneth A. Eriksson Richard D. Law Michal Kowalewski

Quaternary magnetic studies have provided the conceptual framework to bridge magnetic studies into ancient systems. In cases where environmental materials have been subjected to diagenetic alteration two questions come to mind: 1) What part of the magnetic signal is preserved in the rocks; and 2) can the preserved signal be used to infer/identify magnetic patterns that are characteristic of the...

1997
R. M. DeConto N. Wold

The climate of the Holocene is not well suited to be the baseline for the climate of the planet. It is an interglacial, a state typical of only 10% of the past few million years. It is a time of relative sea-level stability after a rapid 130-m rise from the lowstand during the last glacial maximum. Physical geologic processes are operating at unusual rates and much of the geochemical system is ...

Journal: :Quaternary Research 2023

Abstract Perspectives on past climate using lake sediments are critical for assessing modern and future change. These perspectives especially important water-stressed regions such as the western United States. One region is northwestern California (CA), where Holocene-length hydroclimatic records scarce. Here, we present a 9000-year, relative level record from Maddox Lake (CA) multi-indicator a...

Journal: :Carbonates and Evaporites 2022

Abstract The present study deals with microfacies analysis, paleoecology and sequence stratigraphy of the Lower–Middle Eocene rocks in central Nile Valley west-central Sinai. Four rock units were marked (Minia, Darat, Samalut Maghagha formations). Eight facies belts interpreted including lagoon, back bank, main fore bank open marine outer deposited on a gently dipping platform ramp. This ramp m...

Journal: :Quaternary Research 2021

Abstract The protected Tel-Dor coastal embayment in the eastern Mediterranean preserves an unusually complete stratigraphic record that reveals human–environmental interactions throughout Holocene. Interpretation of new seismic profiles collected from shallow marine geophysical transects across bay show five units were correlated with stratigraphy and age dates obtained shallow-marine sediment ...

Journal: :Ground Water Monitoring and Remediation 2023

Abstract At Eglin Air Force Base (AFB) in the Florida Panhandle, a groundwater extraction and treatment system was installed to contain remediate chlorinated solvent plume. After 2 years of operation, not removing contaminant mass at rate predicted or required meet performance‐based contract terms. As result, sequence‐stratigraphic analysis initiated develop strategy improve performance. Sequen...

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