Atypical responses of a large catchment river to the Holocene sea-level highstand: The Murray River, Australia

AbstractThe radiocarbon ages of mollusc shells from the Bogenfels Pan on the hyper arid southern coast of Namibia provide constraints on the Holocene evolution of sea level and in particular, the mid-Holocene highstand. The Bogenfels Pan was flooded to depths of 3 m above mean sea level (amsl) to form a large subtidal lagoon from 7300 to 6500 calibrated radiocarbon years before present (cal yr BP). The mollusc assemblage of the wave sheltered lagoon includes Nassarius plicatellus, Lutraria lutraria, and the bivalves Solen capensis and Gastrana matadoa, both of which no longer live along the wave-dominated southern Namibian coast. The radiocarbon ages of mollusc shell from a gravely beach deposit exposed in a diamond exploration trench indicate that sea level fell to near or 1 m below its present-day position between 6500 and 4900 cal yr BP. The rapid emergence of the pan between 6500 and 4900 cal yr BP exceeds that predicted by glacio-isostatic models and may indicate a 3-m eustatic lowering of sea level. The beach deposits at Bogenfels indicate that sea level rose to 1 m amsl between 4800 and 4600 cal yr BP and then fell briefly between 4600 and 4200 cal yr BP before returning to 1 m amsl. Since 4200 cal yr BP sea level has remained within one meter of the present-day level and the beach at Bogenfels has prograded seaward from the delayed arrival of sand by longshore drift from the Orange River. A 6200 cal yr BP coastal midden and a 600 cal yr BP midden 1.7 km from the coast indicate sporadic human utilization of the area. The results of this study are consistent with previous studies and help to refine the Holocene sea-level record for southern Africa.

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The Holocene sea level story since 7500 BP – Lessons from the Eastern Mediterranean, the Black and the Azov Seas

Quaternary International ◽

10.1016/j.quaint.2008.11.016 ◽

2010 ◽

Vol 225 (2) ◽

pp. 160-179 ◽

Cited By ~ 96

Author(s):

H. Brückner ◽

D. Kelterbaum ◽

O. Marunchak ◽

A. Porotov ◽

A. Vött

Keyword(s):

Sea Level ◽

Eastern Mediterranean ◽

The Holocene ◽

Holocene Sea Level

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Geomorphological & Geoarchaeological Indicators of the Holocene Sea-Level Changes on Ras El Hekma Area, NW Coast of Egypt

Journal of African Earth Sciences ◽

10.1016/j.jafrearsci.2015.11.001 ◽

2016 ◽

Vol 114 ◽

pp. 85-95

Author(s):

Magdy Torab

Keyword(s):

Sea Level ◽

Sea Level Changes ◽

The Holocene ◽

Holocene Sea Level

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Holocene sea-level history of the Canadian Beaufort shelf

Canadian Journal of Earth Sciences ◽

10.1139/e93-009 ◽

1993 ◽

Vol 30 (1) ◽

pp. 103-108 ◽

Cited By ~ 35

Author(s):

Philip R. Hill ◽

Arnaud Héquette ◽

Marie-Hélène Ruz

Keyword(s):

Sea Level Rise ◽

Sea Level ◽

Coastal Zone ◽

Marine Sediments ◽

Tidal Marsh ◽

Relative Sea Level ◽

The Holocene ◽

Single Piece ◽

History Of ◽

Holocene Sea Level

New radiocarbon ages pertaining to the Holocene sea-level history of the Canadian Beaufort shelf are presented. The ages were obtained on samples of freshwater and tidal-marsh peat beds from offshore boreholes and shallow cores in the coastal zone and on molluscs and a single piece of wood deposited in foraminifera-bearing marine sediments. Although none of the samples record directly the position of relative sea level, the suite of ages constrains the regional curve sufficiently to suggest a faster rate of mid Holocene sea level rise (7–14 mm/a) than previously thought. The rate of relative rise slowed markedly in the last 3000 years, approaching the present at a maximum probable rate of 2.5 mm/a.

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On the Holocene sea-level highstand along the Yangtze Delta and Ningshao Plain, East China

Chinese Science Bulletin ◽

10.1007/bf02901755 ◽

2003 ◽

Vol 48 (24) ◽

pp. 2672-2683 ◽

Cited By ~ 37

Author(s):

Cheng Zhu ◽

Chaogui Zheng ◽

Chunmei Ma ◽

Xiaoxuan Yang ◽

Xizhen Gao ◽

...

Keyword(s):

Sea Level ◽

East China ◽

Yangtze Delta ◽

The Holocene ◽

Holocene Sea Level

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Geomorphology of Canyon Outlets in Zrmanja River Estuary and Its Effect on the Holocene Flooding of Semi-enclosed Basins (the Novigrad and Karin Seas, Eastern Adriatic)

Water ◽

10.3390/w12102807 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2807

Author(s):

Ozren Hasan ◽

Slobodan Miko ◽

Dea Brunović ◽

George Papatheodorou ◽

Dimitris Christodolou ◽

...

Keyword(s):

High Resolution ◽

Sea Level Rise ◽

Sea Level ◽

Geophysical Methods ◽

River Estuary ◽

Side Scan Sonar ◽

The Holocene ◽

Karst Environment ◽

Gis Environment ◽

Holocene Sea Level

Detailed multi-beam bathymetry, sub-bottom acoustic, and side-scan sonar observations of submerged canyons with tufa barriers were used to characterize the Zrmanja River karst estuary on the eastern Adriatic coast, Croatia. This unique karst environment consists of two submerged karst basins (Novigrad Sea and Karin Sea) that are connected with river canyons named Novsko Ždrilo and Karinsko Ždrilo. The combined use of high-resolution geophysical data with legacy topography and bathymetry data in a GIS environment allowed for the description and interpretation of this geomorphological setting in relation to the Holocene sea-level rise. The tufa barriers had a predominant influence on the Holocene flooding dynamics of the canyons and karst basins. Here, we describe the possible river pathways from the basins during the lowstand and the formation of a lengthening estuary during the Holocene sea-level rise. Based on the analyzed morphologies and the relative sea-level curve for the Adriatic Sea, the flooding of the Novsko Ždrilo occurred 9200 years before present (BP) and Karinsko Ždrilo was flooded after 8400 years BP. The combination of high-resolution geophysical methods gave an accurate representation of the karst estuarine seafloor and the flooding of semi-isolated basins due to sea-level rise.

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