File:Orange agate tool (16530621008).jpg
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DescriptionOrange agate tool (16530621008).jpg |
Full release: <a href="http://www.blm.gov/or/news/files/BLM_Archaeological_Discovery_Final.pdf" rel="nofollow">www.blm.gov/or/news/files/BLM_Archaeological_Discovery_Fi...</a> Photo Credit: University of Oregon Archaeological Field School Near the Rimrock Draw Rockshelter outside of Riley, Oregon, archaeologists recently discovered evidence suggesting one of the oldest known human occupations in the western United States. Archaeologists with the Bureau of Land Management (BLM) and the University of Oregon Archaeological Field School have been excavating at the Rimrock Draw Rockshelter since 2011. Their discoveries have included a number of stone projectile points and tooth enamel fragments likely belonging to a prehistoric camel (Camelops sp.) that became extinct approximately 13,000 years ago. But what has the archaeological community most excited is a small stone tool found below a layer of volcanic ash. Near the bottom of a 12-foot deposit, archeologists discovered a layer of ash that was identified as volcanic ash from a Mt. St. Helens eruption about 15,800 years ago. Beneath the layer of volcanic ash, archaeologists discovered a small orange agate tool believed to have been used for scraping animal hides, butchering, and possibly carving wood. A blood residue analysis of the tool revealed animal proteins consistent with bison, the most likely species being Bison antiquus, an extinct ancestor of the modern buffalo. “The discovery of this tool below a layer of undisturbed ash that dates to 15,800 years old means that this tool is likely more than 15,800 years old, which would suggest the oldest human occupation west of the Rockies,” said Scott Thomas, BLM Burns District archaeologist. Presently, Oregon’s Paisley Cave, also managed by the BLM, is considered home to the earliest known residents of North America based on human physical evidence. In 2008, a team of archaeologists, led by Dr. Dennis Jenkins with the University of Oregon's Museum of Natural and Cultural History, discovered coprolites - dried feces - containing human DNA dated over 14,000 years old. Dr. Patrick O’Grady, with the University of Oregon Archaeological Field School, has been directing the Rimrock Draw Rockshelter excavations since they began. “When we had the volcanic ash identified, we were stunned because that would make this stone tool one of the oldest artifacts in North America. Given those circumstances and the laws of stratigraphy, this object should be older than the ash,” said O’Grady. “While we need more evidence before we can make an irrefutable claim, we plan to expand our excavation this summer and hopefully provide further evidence of artifacts found consistently underneath that layer of volcanic ash. That’s the next step.” The University of Oregon Archaeological Field School, in partnership with the BLM and volunteers from the Oregon Archaeological Society, will be begin its fifth season this summer, offering students, researchers, and volunteers invaluable field experience. Stan McDonald, BLM Oregon/Washington lead archaeologist, explained the potential this discovery has for the archaeological community. “For years, many in the archaeological field assumed that the first humans in the western hemisphere were the Clovis people – dating to around 13,000 years ago. While a handful of archaeological sites older than Clovis cultures have been discovered in the past few decades, there is still considerable scrutiny of any finding that appears older,” McDonald explained. “With the recent findings at Rimrock Draw Shelter, we want to assemble indisputable evidence because these claims will be scrutinized by researchers. That said, the early discoveries are tantalizing.” |
Date | |
Source | orange agate tool |
Author | Bureau of Land Management Oregon and Washington from Portland, America |
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This image was originally posted to Flickr by BLMOregon at https://flickr.com/photos/50169152@N06/16530621008 (archive). It was reviewed on 13 May 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 May 2018
Public domainPublic domainfalsefalse |
This image is a work of a Bureau of Land Management* employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States. *or predecessor organization |
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current | 15:26, 13 May 2018 | 1,200 × 1,600 (1.41 MB) | OceanAtoll (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot G10 |
Exposure time | 1/200 sec (0.005) |
F-number | f/3.5 |
ISO speed rating | 100 |
Date and time of data generation | 22:31, 13 November 2012 |
Lens focal length | 15.673 mm |
Image title | |
Width | 3,312 px |
Height | 4,416 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS6 (Windows) |
File change date and time | 13:05, 4 March 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 22:31, 13 November 2012 |
Meaning of each component |
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APEX shutter speed | 7.65625 |
APEX aperture | 3.625 |
APEX exposure bias | 0 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
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Focal plane resolution unit | inches |
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File source | Digital still camera |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Unique ID of original document | E90189144483C2ACEF4D0BEE5D1C700F |
Date metadata was last modified | 05:05, 4 March 2015 |