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Full-Text Articles in Physical Sciences and Mathematics
Cyclicity In The Nearshore Marine To Coastal, Lower Permian, Pebbley Beach Formation, Southern Sydney Basin, Australia: A Record Of Relative Sea-Level Fluctuations At The Close Of The Late Palaeozoic Gondwanan Ice Age, Brian G. Jones, Stuart C. Tye, James A. Maceachern, Kerrie L. Bann, Christopher R. Fielding
Cyclicity In The Nearshore Marine To Coastal, Lower Permian, Pebbley Beach Formation, Southern Sydney Basin, Australia: A Record Of Relative Sea-Level Fluctuations At The Close Of The Late Palaeozoic Gondwanan Ice Age, Brian G. Jones, Stuart C. Tye, James A. Maceachern, Kerrie L. Bann, Christopher R. Fielding
B. G. Jones
The Lower Permian (Artinskian to Sakmarian) Pebbley Beach Formation of the southernmost Sydney Basin in New South Wales, Australia, records sediment accumulation in shallow marine to coastal environments at the close of the Late Palaeozoic Gondwanan ice age. This paper presents a sequence stratigraphic re-evaluation of the upper half of the unit based on the integration of sedimentology and ichnology. Ten facies are recognized, separated into two facies associations. Facies Association A (7 facies) comprises variably bioturbated siltstones and sandstones with marine body fossils, interpreted to record sediment accumulation in open marine environments ranging from lower offshore to middle shoreface …
Late Quaternary Mega-Lakes Fed By The Northern And Southern River Systems Of Central Australia: Varying Moisture Sources And Increased Continental Aridity, T Cohen, G Nanson, John Jansen, B Jones, Z Jacobs, J Larsen, J.-H May, P Treble, D Price, A Smith
Late Quaternary Mega-Lakes Fed By The Northern And Southern River Systems Of Central Australia: Varying Moisture Sources And Increased Continental Aridity, T Cohen, G Nanson, John Jansen, B Jones, Z Jacobs, J Larsen, J.-H May, P Treble, D Price, A Smith
B. G. Jones
Optically stimulated and thermoluminescence ages from relict shorelines, along with accelerator mass spectrometer 14C ages from freshwater molluscs reveal a record of variable moisture sources supplied by northern and southern river systems to Lake Mega-Frome in southern central Australia during the late Quaternary. Additional lacustrine, palynological and terrestrial proxies are used to reconstruct a record that extends back to 105 ka, confirming that Lakes Mega-Frome and Mega-Eyre were joined to create the largest system of palaeolakes on the Australian continent as recently as 50-47 ka. The palaeohydrological record indicates a progressive shift to more arid conditions, with marked drying after …
Were Environmental Or Demographic Factors The Driving Force Behind Middle Stone Age Innovations In Southern Africa?, Zenobia Jacobs, Richard G. Roberts
Were Environmental Or Demographic Factors The Driving Force Behind Middle Stone Age Innovations In Southern Africa?, Zenobia Jacobs, Richard G. Roberts
Richard G Roberts
Sir—Past human responses to environmental changes have long interested archaeologists. During the last glacial cycle, southern Africa experienced marked climatic fluctuations, as recorded in ice-core records from West and East Antarctica.
Development Of The Sar Tt-Osl Procedure For Dating Middle Pleistocene Dune And Shallow Marine Deposits Along The Southern Cape Coast Of South Africa, Zenobia Jacobs, Richard Roberts, Terry Lachlan, Panagiotis Karkanas, Curtis Marean, David Roberts
Development Of The Sar Tt-Osl Procedure For Dating Middle Pleistocene Dune And Shallow Marine Deposits Along The Southern Cape Coast Of South Africa, Zenobia Jacobs, Richard Roberts, Terry Lachlan, Panagiotis Karkanas, Curtis Marean, David Roberts
Richard G Roberts
Optically stimulated luminescence (OSL) dating is now commonly used to estimate the depositional age of Quaternary landforms along the southern Cape coast of South Africa. Due to the early onset of dose saturation in the quartz-rich sediments from this region, determining the age of deposits much older than the last three glacio-eustatic sea-level high stands has been a challenge. In this study, we explored the feasibility of using the thermally-transferred OSL (TT-OSL) dating method to obtain ages for aeolian and shallow marine deposits at three different localities that hold promise to further illuminate the long and complex Late Quaternary sea-level …
An Improved Osl Chronology For The Still Bay Layers At Blombos Cave, South Africa: Further Tests Of Single-Grain Dating Procedures And A Re-Evaluation Of The Timing Of The Still Bay Industry Across Southern Africa, Zenobia Jacobs, Elspeth Hayes, Richard Roberts, Rex Galbraith, Christopher Henshilwood
An Improved Osl Chronology For The Still Bay Layers At Blombos Cave, South Africa: Further Tests Of Single-Grain Dating Procedures And A Re-Evaluation Of The Timing Of The Still Bay Industry Across Southern Africa, Zenobia Jacobs, Elspeth Hayes, Richard Roberts, Rex Galbraith, Christopher Henshilwood
Richard G Roberts
This paper presents a series of new single-grain optically stimulated luminescence (OSL) ages for the Still Bay at Blombos Cave, South Africa, and compares them to previously published OSL, thermoluminescence (TL) and electron-spin resonance (ESR) ages for this site. Details are provided about the measurement and analytical procedures, including a discussion of the characteristics of the OSL signals of individual quartz grains. This forms the basis for further investigations into the sensitivity of the equivalent dose (De) estimates to a range of different analytical approaches, including changes in the size of the test dose, the choice of signal integration interval, …
Catalysts For Stone Age Innovations: What Might Have Triggered Two Short-Lived Bursts Of Technological And Behavioral Innovation In Southern Africa During The Middle Stone Age?, Richard Roberts, Zenobia Jacobs
Catalysts For Stone Age Innovations: What Might Have Triggered Two Short-Lived Bursts Of Technological And Behavioral Innovation In Southern Africa During The Middle Stone Age?, Richard Roberts, Zenobia Jacobs
Richard G Roberts
No abstract provided.
A Southern Indian Middle Palaeolithic Occupation Surface Sealed By The 74 Ka Toba Eruption: Further Evidence From Jwalapuram Locality 22, Richard Roberts, Allan Chivas, Christopher Clarkson, Ravi Korisettar, Nicole Boivin, Michael Petraglia, Peter Ditchfield, Michael Haslam, Janardhana Bora, Sanjay Eksambekar, Victoria Smith, Anna Oh, Clair Harris
A Southern Indian Middle Palaeolithic Occupation Surface Sealed By The 74 Ka Toba Eruption: Further Evidence From Jwalapuram Locality 22, Richard Roberts, Allan Chivas, Christopher Clarkson, Ravi Korisettar, Nicole Boivin, Michael Petraglia, Peter Ditchfield, Michael Haslam, Janardhana Bora, Sanjay Eksambekar, Victoria Smith, Anna Oh, Clair Harris
Richard G Roberts
No abstract provided.