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Articles 31 - 60 of 142
Full-Text Articles in Social and Behavioral Sciences
Initial Speleothem Results From Western Flores And Eastern Java, Indonesia: Were Climate Changes From 47 To 5ka Responsible For The Extinction Of Homo Floresiensis?, Richard Roberts, Allan Chivas, T. Sutikna, Michael Morwood, J Zhao, Kira Westaway
Initial Speleothem Results From Western Flores And Eastern Java, Indonesia: Were Climate Changes From 47 To 5ka Responsible For The Extinction Of Homo Floresiensis?, Richard Roberts, Allan Chivas, T. Sutikna, Michael Morwood, J Zhao, Kira Westaway
Richard G Roberts
No abstract provided.
Redating The Advance Of The New Zealand Franz Josef Glacier During The Last Termination: Evidence For Asynchronous Climate Change, Richard Roberts, Christian Turney, Matt Mcglone, J Cooper, J Wilmshurst, N De Jonge, C Prior
Redating The Advance Of The New Zealand Franz Josef Glacier During The Last Termination: Evidence For Asynchronous Climate Change, Richard Roberts, Christian Turney, Matt Mcglone, J Cooper, J Wilmshurst, N De Jonge, C Prior
Richard G Roberts
No abstract provided.
New Ages For Middle And Later Stone Age Deposits At Mumba Rockshelter, Tanzania: Optically Stimulated Luminescence Dating Of Quartz And Feldspar Grains, Luke Gliganic, Zenobia Jacobs, Richard Roberts, M Dominguez-Rodrigo, A Mabulla
New Ages For Middle And Later Stone Age Deposits At Mumba Rockshelter, Tanzania: Optically Stimulated Luminescence Dating Of Quartz And Feldspar Grains, Luke Gliganic, Zenobia Jacobs, Richard Roberts, M Dominguez-Rodrigo, A Mabulla
Richard G Roberts
The archaeological deposits at Mumba rockshelter, northern Tanzania, have been excavated for more than 70 years, starting with Margit and Ludwig Köhl-Larsen in the 1930s. The assemblages of Middle Stone Age (MSA) and Later Stone Age (LSA) artefacts collected from this site constitute the type sequences for these cultural phases in East Africa. Despite its archaeological importance, however, the chronology of the site is poorly constrained, despite the application since the 1980s of several dating methods (radiocarbon, uranium-series and amino acid racemisation) to a variety of materials recovered from the deposits. Here, we review these previous chronologies for Mumba and …
Human Occupation, Adaptation And Behavioural Change In The Pleistocene And Holocene Of South India: Recent Investigations In The Kurnool District, Andhra Pradesh, Richard Roberts, Kevin White, Christopher Clarkson, Jinu Koshy, Ravi Korisettar, Sacha Jones, Clive Oppenheimer, Nicole Boivin, Michael Petraglia, Peter Ditchfield, Janardhana B, Jamie Hampson, Preston Miracle, Kevin Cunningham, M Kasturi Bai, Dorian Fuller, Michael Haslam
Human Occupation, Adaptation And Behavioural Change In The Pleistocene And Holocene Of South India: Recent Investigations In The Kurnool District, Andhra Pradesh, Richard Roberts, Kevin White, Christopher Clarkson, Jinu Koshy, Ravi Korisettar, Sacha Jones, Clive Oppenheimer, Nicole Boivin, Michael Petraglia, Peter Ditchfield, Janardhana B, Jamie Hampson, Preston Miracle, Kevin Cunningham, M Kasturi Bai, Dorian Fuller, Michael Haslam
Richard G Roberts
No abstract provided.
Establishing The Time Of Initial Human Occupation Of Liang Bua, Western Flores, Indonesia, Kira Westaway, Michael Morwood, Richard Roberts, J Zhao, T. Sutikna, E.W. Saptomo, W Rink
Establishing The Time Of Initial Human Occupation Of Liang Bua, Western Flores, Indonesia, Kira Westaway, Michael Morwood, Richard Roberts, J Zhao, T. Sutikna, E.W. Saptomo, W Rink
Richard G Roberts
No abstract provided.
Reconstructing The Geomorphic History Of Liang Bua, Flores, Indonesia: A Stratigraphic Interpretation Of The Occupational Environment, Kira Westaway, T. Sutikna, W. Saptomo, _ Jatmiko, M Morwood, Richard Roberts, D. Hobbs
Reconstructing The Geomorphic History Of Liang Bua, Flores, Indonesia: A Stratigraphic Interpretation Of The Occupational Environment, Kira Westaway, T. Sutikna, W. Saptomo, _ Jatmiko, M Morwood, Richard Roberts, D. Hobbs
Richard G Roberts
No abstract provided.
Low Temperature (Lt) Combustion Of Sediments Does Not Necessarily Provide Accurate Radiocarbon Ages For Site Chronology, F. Brock, D. Froese, Richard Roberts
Low Temperature (Lt) Combustion Of Sediments Does Not Necessarily Provide Accurate Radiocarbon Ages For Site Chronology, F. Brock, D. Froese, Richard Roberts
Richard G Roberts
No abstract provided.
Age Constraints On Pleistocene Megafauna At Tight Entrance Cave In Southwestern Australia, Richard Roberts, L K Fifield, R. Grun, Richard Jones, M Bird, Gavin Prideaux, G Gully, Linda Ayliffe, Richard Cresswell
Age Constraints On Pleistocene Megafauna At Tight Entrance Cave In Southwestern Australia, Richard Roberts, L K Fifield, R. Grun, Richard Jones, M Bird, Gavin Prideaux, G Gully, Linda Ayliffe, Richard Cresswell
Richard G Roberts
No abstract provided.
Geochronology Of Cave Deposits At Liang Bua And Of Adjacent River Terraces In The Wae Racang Valley, Western Flores Indonesia: A Synthesis Of Age Estimates For The Type Locality Of Homo Floresiensis, Richard Roberts, Kira Westaway, J. Zhao, C Turney, M. Bird, W Rink, L. Fifield
Geochronology Of Cave Deposits At Liang Bua And Of Adjacent River Terraces In The Wae Racang Valley, Western Flores Indonesia: A Synthesis Of Age Estimates For The Type Locality Of Homo Floresiensis, Richard Roberts, Kira Westaway, J. Zhao, C Turney, M. Bird, W Rink, L. Fifield
Richard G Roberts
A robust timeframe for the extant cave deposits at Liang Bua, and for the river terraces in the adjoining Wae Racang valley, is essential to constrain the period of existence and time of extinction of Homo floresiensis and other biota that have been excavated at this hominin type locality. Reliable age control is also required for the variety of artifacts excavated from these deposits, and to assist in environmental reconstructions for this river valley and for the region more broadly. In this paper, we summarize the available geochronological information for Liang Bua and its immediate environs, obtained using seven numerical-age …
Would The Australian Megafauna Have Become Extinct If Humans Had Never Colonised The Continent? Comments On 'A Review Of The Evidence For A Human Role In The Extinction Of Australian Megafauna And An Alternative Explanation' By S.Wroe And J.Field, Barry Brook, David Burney, Timothy Flannery, Michael Gagan, Richard Gillespie, Christopher Johnson, Peter Kershaw, John Magee, Paul Martin, Gifford Miller, Benny Peiser, Richard Roberts
Would The Australian Megafauna Have Become Extinct If Humans Had Never Colonised The Continent? Comments On 'A Review Of The Evidence For A Human Role In The Extinction Of Australian Megafauna And An Alternative Explanation' By S.Wroe And J.Field, Barry Brook, David Burney, Timothy Flannery, Michael Gagan, Richard Gillespie, Christopher Johnson, Peter Kershaw, John Magee, Paul Martin, Gifford Miller, Benny Peiser, Richard Roberts
Richard G Roberts
The problem of the worldwide extinction of a diverse assemblage of Late Pleistocene and Holocene large-bodied animals continues to cause debate (Brook and Bowman, 2002; Barnosky et al., 2004; Burney and Flannery, 2005; Koch and Barnosky, 2006). The most recent contribution on the Australian megafaunal extinction (Wroe and Field, 2006), argues for a staggered series of extinctions over multiple glacial cycles, with most megafaunal extinctions predating the arrival of humans and driven primarily by climate change eventually causing a ‘hydrological threshold’ to be breached. At this point, accessible water became too scarce for megafauna to forage successfully. Although Wroe and …
Changing Ideas On The Identity And Stratigraphic Significance Of The Sheep Creek Tephra Beds In Alaska And The Yukon Territory, Northwestern North America, Richard Roberts, Martina Demuro, D Froese, N Pearce, S Preece, W Hart, W Perkins, J Westgate
Changing Ideas On The Identity And Stratigraphic Significance Of The Sheep Creek Tephra Beds In Alaska And The Yukon Territory, Northwestern North America, Richard Roberts, Martina Demuro, D Froese, N Pearce, S Preece, W Hart, W Perkins, J Westgate
Richard G Roberts
No abstract provided.
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.
Still Bay And Serrated Points From Umhlatuzana Rock Shelter, Kwazulu-Natal, South Africa, Marlize Lombard, Lyn Wadley, Zenobia Jacobs, Moleboheng Mohapi, Richard Roberts
Still Bay And Serrated Points From Umhlatuzana Rock Shelter, Kwazulu-Natal, South Africa, Marlize Lombard, Lyn Wadley, Zenobia Jacobs, Moleboheng Mohapi, Richard Roberts
Richard G Roberts
No abstract provided.
Stochastic Modelling Of Multi-Grain Equivalent Dose (De) Distributions: Implications For Osl Dating Of Sediment Mixtures, Richard Roberts, Lee Arnold
Stochastic Modelling Of Multi-Grain Equivalent Dose (De) Distributions: Implications For Osl Dating Of Sediment Mixtures, Richard Roberts, Lee Arnold
Richard G Roberts
No abstract provided.
Optically Stimulated Luminescence Dating Of Single And Multiple Grains Of Quartz From Perennially Frozen Loess In Western Yukon Territory, Canada: Comparison With Radiocarbon Chronologies For The Late Pleistocene Dawson Tephra, Richard Roberts, Lee Arnold, Martina Demuro, F Brock, D Froese, C Bronk Ramsey
Optically Stimulated Luminescence Dating Of Single And Multiple Grains Of Quartz From Perennially Frozen Loess In Western Yukon Territory, Canada: Comparison With Radiocarbon Chronologies For The Late Pleistocene Dawson Tephra, Richard Roberts, Lee Arnold, Martina Demuro, F Brock, D Froese, C Bronk Ramsey
Richard G Roberts
No abstract provided.
Population Increase And Environmental Deterioration Correspond With Microlithic Innovations In South Asia Ca. 35,000 Years Ago, Richard Roberts, Lee Arnold, Christopher Clarkson, Jinu Koshy, Ravi Korisettar, Sacha Jones, Nicole Boivin, Michael Petraglia, Marta Lahr, Peter Ditchfield, Mait Metspalu, Hannah James, Dorian Fuller, Michael Haslam, Gyaneshwer Chaubey, Toomas Kivisild
Population Increase And Environmental Deterioration Correspond With Microlithic Innovations In South Asia Ca. 35,000 Years Ago, Richard Roberts, Lee Arnold, Christopher Clarkson, Jinu Koshy, Ravi Korisettar, Sacha Jones, Nicole Boivin, Michael Petraglia, Marta Lahr, Peter Ditchfield, Mait Metspalu, Hannah James, Dorian Fuller, Michael Haslam, Gyaneshwer Chaubey, Toomas Kivisild
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.
Single-Grain Osl Chronologies For Middle Palaeolithic Deposits At El Mnasra And El Harhoura 2, Morocco: Implications For Late Pleistocene Human-Environment Interactions Along The Atlantic Coast Of Northwest Africa, Zenobia Jacobs, Richard Roberts, Roland Nespoulet, M El Hajraoui, Andre Debenath
Single-Grain Osl Chronologies For Middle Palaeolithic Deposits At El Mnasra And El Harhoura 2, Morocco: Implications For Late Pleistocene Human-Environment Interactions Along The Atlantic Coast Of Northwest Africa, Zenobia Jacobs, Richard Roberts, Roland Nespoulet, M El Hajraoui, Andre Debenath
Richard G Roberts
Optically stimulated luminescence (OSL) measurements were made on individual, sand-sized grains of quartz from Middle Palaeolithic deposits at two cave sites (El Harhoura 2 and El Mnasra) on the Atlantic coast of Morocco. We were able to calculate OSL ages for 32 of the 33 samples collected from the Middle Palaeolithic deposits, including the earliest and latest Aterian levels at both sites. These ages reveal periods of occupation between about 110 and 95 ka (thousands of years ago), and at ~75 ka. A late Middle Palaeolithic occupation of El Harhoura 2 is also recorded at ~55 ka. Our single-grain OSL …
Testing Times: Old And New Chronologies For The Howieson's Poort And Still Bay Industries In Environmental Context, Richard Roberts, Zenobia Jacobs
Testing Times: Old And New Chronologies For The Howieson's Poort And Still Bay Industries In Environmental Context, Richard Roberts, Zenobia Jacobs
Richard G Roberts
No abstract provided.
Dating The Quaternary: Progress In Luminescence Dating Of Sediments, Richard Roberts, O Lian
Dating The Quaternary: Progress In Luminescence Dating Of Sediments, Richard Roberts, O Lian
Richard G Roberts
No abstract provided.
Melting Ice Sheets 400,000 Yr Ago Raised Sea Level By 13 M: Past Analogue For Future Trends, David Roberts, Panagiotis Karkanas, Zenobia Jacobs, Curtis Marean, Richard Roberts
Melting Ice Sheets 400,000 Yr Ago Raised Sea Level By 13 M: Past Analogue For Future Trends, David Roberts, Panagiotis Karkanas, Zenobia Jacobs, Curtis Marean, Richard Roberts
Richard G Roberts
Marine Isotope Stage (MIS) 11 was possibly the longest (∼423,000–362,000 yr ago) and warmest interglacial of the entire Quaternary Period. This resulted from a special arrangement of Earth's orbital parameters-similar to the present interglacial (MIS 1)-suggesting that MIS 11 provides an analogue for future natural climate forcing and sea levels. Although precise documentation of MIS 11 sea level history is, therefore, crucial – especially considering additional impetus from anthropogenic warming – the maximum MIS 11 sea level remains highly contentious. Estimates from onshore indicators have ranged from below present sea level to about +20 m, resulting from uncertainties in reliability …
Single-Grain Optical Dating Of Grave-Infill Associated With Human Burials At Lake Mungo Australia, Jonathon Olley, Richard Roberts, Hiroyuki Yoshida, James M Bowler
Single-Grain Optical Dating Of Grave-Infill Associated With Human Burials At Lake Mungo Australia, Jonathon Olley, Richard Roberts, Hiroyuki Yoshida, James M Bowler
Richard G Roberts
Recent age constraints on Australia's oldest human remains (Mungo I and III), found at Lake Mungo in western New South Wales, relied on optical dating of sands from the same stratigraphic units as those into which the remains had been inserted (42±3 ka) and those that overlay the graves (38±2 ka), giving a burial age of 40±2 ka. This indirect means of dating the burials was necessary because the original site from which the remains had been excavated had been completely eroded away. At the time of the original excavation of the Mungo III grave, blocks of sediment from the …
Error Variation In Osl Palaeodose Estimates From Singles Aliquots Of Quartz: A Factorial Experiment, Richard Roberts, R.F. Galbraith, Hiroyuki Yoshida
Error Variation In Osl Palaeodose Estimates From Singles Aliquots Of Quartz: A Factorial Experiment, Richard Roberts, R.F. Galbraith, Hiroyuki Yoshida
Richard G Roberts
No abstract provided.
Homo Floresiensis And The Late Pleistocene Environments Of Eastern Indonesia: Defining The Nature Of The Relationship, Kira Westaway, M Morwood, T. Sutikna, M. Moore, A. Rokus, G Van Den Bergh, Richard Roberts, E. Saptomo
Homo Floresiensis And The Late Pleistocene Environments Of Eastern Indonesia: Defining The Nature Of The Relationship, Kira Westaway, M Morwood, T. Sutikna, M. Moore, A. Rokus, G Van Den Bergh, Richard Roberts, E. Saptomo
Richard G Roberts
No abstract provided.
New Ages For Human Occupation And Climatic Change At Lake Mungo Australia, James Bowler, Harvey Johnston, Jon M Olley, John Prescott, Richard Roberts, Wilfred Shawcross, Nigel Spooner
New Ages For Human Occupation And Climatic Change At Lake Mungo Australia, James Bowler, Harvey Johnston, Jon M Olley, John Prescott, Richard Roberts, Wilfred Shawcross, Nigel Spooner
Richard G Roberts
Australia’s oldest human remains, found at Lake Mungo, include the world’s oldest ritual ochre burial (Mungo III) and the first recorded cremation (Mungo I). Until now, the importance of these finds has been constrained by limited chronologies and palaeoenvironmental information. Mungo III, the source of the world’s oldest human mitochondrial DNA, has been variously estimated at 30 thousand years (kyr) old, 42–45 kyr old and 62 +/- 6 kyr old. while radiocarbon estimates placed theMungo I cremation near 20–26 kyr ago. Here we report a new series of 25 optical ages showing that both burials occurred at 40 +/- 2 …
Middle Paleolithic Assemblages From The Indian Subcontinent, Before And After The Toba Super-Eruption, Michael Petraglia, Ravi Korisettar, Nicole Boivin, Christopher Clarkson, Peter Ditchfield, Sacha Jones, Jinu Koshy, Marta Lahr, Clive Oppenheimer, David Pyle, Richard Roberts, Jean-Luc Schwenninger, Lee Arnold, Kevin White
Middle Paleolithic Assemblages From The Indian Subcontinent, Before And After The Toba Super-Eruption, Michael Petraglia, Ravi Korisettar, Nicole Boivin, Christopher Clarkson, Peter Ditchfield, Sacha Jones, Jinu Koshy, Marta Lahr, Clive Oppenheimer, David Pyle, Richard Roberts, Jean-Luc Schwenninger, Lee Arnold, Kevin White
Richard G Roberts
The Youngest Toba Tuff (YTT) eruption, which occurred in Indonesia 74,000 years ago, is one of Earth's largest known volcanic events. The effect of the YTT eruption on existing populations of humans, and accordingly on the course of human evolution, is debated. Here we associate the YTT with archaeological assemblages at Jwalapuram, in the Jurreru River valley of southern India. Broad continuity of Middle Paleolithic technology across the YTT event suggests that hominins persisted regionally across this major eruptive event.
A Dual-Aliquot Regenerative-Dose Protocol (Dap) For Thermoluminescence (Tl) Dating Of Quartz Sediments Using The Light-Sensitive And Isothermally Stimulated Red Emissions, Richard Roberts, Kira Westaway
A Dual-Aliquot Regenerative-Dose Protocol (Dap) For Thermoluminescence (Tl) Dating Of Quartz Sediments Using The Light-Sensitive And Isothermally Stimulated Red Emissions, Richard Roberts, Kira Westaway
Richard G Roberts
No abstract provided.
A Revised Burial Dose Estimation Procedure For Optical Dating Of Young And Modern-Age Sediments, Richard Roberts, Lee Arnold, R.F. Galbraith, S Delong
A Revised Burial Dose Estimation Procedure For Optical Dating Of Young And Modern-Age Sediments, Richard Roberts, Lee Arnold, R.F. Galbraith, S Delong
Richard G Roberts
No abstract provided.
An Arid-Adapted Middle Pleistocene Vertebrate Fauna From South-Central Australia, Richard Roberts, Lee Arnold, John Hellstrom, Gavin Prideaux, Mark Hutchinson, Linda Ayliffe, Walter Boles, Matthew Cupper, Paul Devine, Brad Pillans, John Long
An Arid-Adapted Middle Pleistocene Vertebrate Fauna From South-Central Australia, Richard Roberts, Lee Arnold, John Hellstrom, Gavin Prideaux, Mark Hutchinson, Linda Ayliffe, Walter Boles, Matthew Cupper, Paul Devine, Brad Pillans, John Long
Richard G Roberts
No abstract provided.
Turning Back The Clock On The Extinction Of Megafauna In Australia, Richard Roberts, Barry Brook
Turning Back The Clock On The Extinction Of Megafauna In Australia, Richard Roberts, Barry Brook
Richard G Roberts
No abstract provided.