Navigation Links
Scientists discover oldest evidence of human stone tool use and meat-eating
Date:8/12/2010

ntains only deposits older than a tuff securely dated to 3.24 million years ago. Below the find site is another tuff dated to 3.42 million years ago. This makes the age of the bones between 3.42 and 3.24 million years ago, but because the cut-marked bones are much closer to the lower tuff and below several other horizons, whose date can be estimated, the bones' estimated age can be further refined to 3.4 million years ago.

Both of the marked bones came from large mammals. One fossil is a rib fragment, the other a femur shaft fragment. Both are marred by cut, scrape, and percussion marks. Microscope and elemental analysis using secondary electron imaging and energy dispersive x-ray spectrometry demonstrated that these marks were created before the bones fossilized meaning that we can eliminate recent damage as the cause of these marks. Dr. Hamdallah Bearat from the Ira A. Fulton Schools of Engineering at Arizona State University determined that one cut mark even contained a tiny, embedded piece of rock that was likely left behind during the butchering process.

"Most of the marks have features that indicate without doubt that they were inflicted by stone tools," explains Dr. Curtis Marean from the Institute of Human Origins at Arizona State University, who performed the mark identifications. "And the range of actions includes cutting and scraping for the removal of flesh, and percussion on the femur for breaking it to access marrow."

"The bones come from 2 animals, one (a femur) the size of a goat and the other (a rib) at least the size of a cow," notes Marean. "Our closest living relatives, the chimps and bonobos, don't hunt or scavenge animals this size, so this suggests that the Dikika australopithecines had already begun to engage in hunting or scavenging larger mammals. This places them in competitive and risky contexts."

While it is clear that the australopithecines at Dikika were using sharp-edged stones to carve meat from bo
'/>"/>

Contact: Sandra Jacob
jacob@eva.mpg.de
49-341-355-0122
Max-Planck-Gesellschaft
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Jefferson scientists deliver toxic genes to effectively kill pancreatic cancer cells
2. Scientists identify novel inhibitor of human microRNA
3. Argonne scientists peer into heart of compound that may detect chemical, biological weapons
4. MU scientists go green with gold, distribute environmentally friendly nanoparticles
5. Scientists identify gene that may contribute to improved rice yield
6. Scientists discover why a mothers high-fat diet contributes to obesity in her children
7. MU scientists see how HIV matures into an infection
8. Earth scientists keep an eye on Texas
9. Thinking it through: Scientists call for policy to guide biofuels industry toward sustainability
10. Scientists identify a molecule that coordinates the movement of cells
11. Scientists Find new migratory patterns for Mediterranean and Western Atlantic bluefin tuna
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Scientists discover oldest evidence of human stone tool use and meat-eating
(Date:8/20/2014)... finds life can persist in a cold, dark world. ... team that examined waters and sediments from a shallow ... the extreme environment supports microbial ecosystems. , The ... colleagues has implications for life in other extreme environments, ... findings are published in the current edition of the ...
(Date:8/20/2014)... in in this image of the Para and Mato ... most likely intentionally set in order to deforest the ... stand of trees where the land is thereafter converted ... of forestland to farms, ranches, or urban use. The ... the Amazon Rainforest in the middle of the image ...
(Date:8/20/2014)... Health has awarded the Oklahoma Medical Research Foundation a ... anthrax and the bacteria,s effects on humans. , ... his colleagues have studied the human immune response to ... Human Immunology. The original funding came soon after anthrax-laced ... of the terrorist attacks of Sept. 11, 2001. ...
Breaking Biology News(10 mins):University of Tennessee research uncovers subglacial life beneath Antarctic ice sheet 2$14.5 million grant awarded to continue anthrax studies 2
... Rome, Italy: Researchers have developed a way of accurately ... blood test. The average difference between the predicted age and ... the menopause was only a third of a year, and ... years. Dr Fahimeh Ramezani Tehrani will tell the 26th ...
... new technology that allows scientists to monitor how individual cells ... researchers have uncovered a much larger spectrum of differences between ... act in a uniform fashion, as was previously thought. ... Markus Covert, PhD, assistant professor of bioengineering and senior author ...
... 27th, 2010 The Elsevier Foundation, TWAS and TWOWS ... scientists from Africa, the Middle East, Asia, Latin America ... was made at the Third World Organization for Women ... Women Scientists in a Changing World, hosted by the ...
Cached Biology News:Researchers develop accurate way to predict the age when women will hit the menopause 2Researchers develop accurate way to predict the age when women will hit the menopause 3Same types of cell respond differently to stimulus, Stanford study shows 2Same types of cell respond differently to stimulus, Stanford study shows 312 women scientists announced as winners of Elsevier Foundation TWOWS Awards 2
(Date:8/19/2014)... , Aug. 19, 2014 ... the addition of the "Spectroscopy Equipment ... report to their offering. ... for Spectroscopy Equipment and Accessories in US$ ... Spectroscopy (UV-Vis spectrophotometers, Raman Spectrometers, NMR-EPR Spectrometers, ...
(Date:8/19/2014)... November 2012, the European Union (EU) mandated use of the ... PSUR – responding to the increasing need to understand and ... in many regions, the main objectives of the PBRER are ... analysis of new or emerging information on the risks of ... the potential benefits of a drug; and , ...
(Date:8/19/2014)... , Aug. 19, 2014 /PRNewswire/ - iCo Therapeutics ... ICOTF), today reported results of its Oral Amphotericin ... HIV reservoirs.  The study, conducted by ImmuneCarta®, the ... in vitro effectiveness of Oral Amp B ... present in individuals despite intensive treatment with antiretroviral ...
(Date:8/18/2014)... 2014 Deep Research Report on ... and in-depth research report on the China Linalool ... including its definition, classification, application, and industry chain ... covers the international market analysis, including China’s domestic ... macroeconomic environment & economic situation analysis. The report ...
Breaking Biology Technology:Global Spectroscopy Equipment and Accessories - Strategic Business Report 2014 2Top Five Best Practices for Developing Your Periodic Benefit Risk Evaluation Report (PBRER), New Webinar Hosted by Xtalks 2iCo Therapeutics Announces Positive Oral Amphotericin B Study Results 2iCo Therapeutics Announces Positive Oral Amphotericin B Study Results 3Linalool Industry & Diphenylamine Market (Global, China) 2014 Analysis Now Available at DeepResearchReports.com 2Linalool Industry & Diphenylamine Market (Global, China) 2014 Analysis Now Available at DeepResearchReports.com 3Linalool Industry & Diphenylamine Market (Global, China) 2014 Analysis Now Available at DeepResearchReports.com 4
... Dec. 9 BioMarin Pharmaceutical,Inc. (Nasdaq: ... partner Merck Serono, a division,of Merck KGaA, ... (sapropterin dihydrochloride) for the treatment of,hyperphenylalaninemia (HPA) ... the European Commission. Merck Serono estimates ...
... DCTH ) today announced the appointment of Roger G. ... Executive Chairman of Cortex Pharmaceuticals, Inc. (Amex: COR ), ... disorders. , , (Logo: ... Prior to joining Cortex, Dr. Stoll worked as a consultant ...
... Md., Dec. 9 EntreMed, Inc.,(Nasdaq: ... the treatment of cancer and inflammatory diseases, today,announced ... of ENMD-2076 in refractory,multiple myeloma patients. The study ... Melvin and Bren Simon Cancer Center, Indianapolis, Indiana. ...
Cached Biology Technology:Kuvan Receives Marketing Approval in the European Union 2Kuvan Receives Marketing Approval in the European Union 3Kuvan Receives Marketing Approval in the European Union 4Delcath Adds Senior Pharmaceutical Professional to Its Board of Directors 2Delcath Adds Senior Pharmaceutical Professional to Its Board of Directors 3EntreMed Initiates ENMD-2076 Clinical Trial in Multiple Myeloma 2EntreMed Initiates ENMD-2076 Clinical Trial in Multiple Myeloma 3EntreMed Initiates ENMD-2076 Clinical Trial in Multiple Myeloma 4
... Ambion's custom siRNA service provides the premium ... silencing research. Custom siRNAs can be readily ... base target sequence, or by providing the ... out Ambion's Silencer Validated and Silencer Pre-designed ...
, Premium quality synthesis and purification , You provide the sequence, we'll do the rest , Rigorous quality control , Your choice of purification method, amount and format , Available annealed...
, Premium quality synthesis and purification , You provide the sequence, we'll do the rest , Rigorous quality control , Your choice of purification method, amount and format , Available annealed...
Human TGF-beta RIIb Affinity Purified Polyclonal Ab...
Biology Products: