File:My Public Lands Roadtrip- Rimrock Draw Rockshelter in Oregon (19214010151).jpg
Original file (1,800 × 1,200 pixels, file size: 1.72 MB, MIME type: image/jpeg)
Captions
Summary[edit]
DescriptionMy Public Lands Roadtrip- Rimrock Draw Rockshelter in Oregon (19214010151).jpg |
Near the Rimrock Draw Rockshelter outside of Riley, Oregon, archaeologists recently discovered evidence suggesting one of the oldest known human occupations in the western U.S. With assistance from local students, archaeologists with the 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 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, archaeologists 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 BLM Burns District Archaeologist Scott Thomas. |
Date | |
Source | My Public Lands Roadtrip: Rimrock Draw Rockshelter in Oregon |
Author | Bureau of Land Management |
Licensing[edit]
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by mypubliclands at https://flickr.com/photos/91981596@N06/19214010151. It was reviewed on 5 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
5 August 2015
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 |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 18:31, 4 August 2015 | 1,800 × 1,200 (1.72 MB) | Wilfredor (talk | contribs) | Transferred from Flickr via Flickr2Commons |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Canon |
---|---|
Camera model | Canon EOS DIGITAL REBEL XS |
Exposure time | 3/5 sec (0.6) |
F-number | f/11 |
ISO speed rating | 100 |
Date and time of data generation | 14:41, 9 October 2013 |
Lens focal length | 50 mm |
Width | 3,888 px |
Height | 2,592 px |
Bits per component |
|
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 | 13:09, 4 March 2015 |
Y and C positioning | Co-sited |
Exposure Program | Manual |
Exif version | 2.21 |
Date and time of digitizing | 14:41, 9 October 2013 |
Meaning of each component |
|
APEX shutter speed | 0.75 |
APEX aperture | 7 |
APEX exposure bias | 0 |
Maximum land aperture | 2.625 APEX (f/2.48) |
Metering mode | Partial |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 41 |
DateTimeOriginal subseconds | 41 |
DateTimeDigitized subseconds | 41 |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 4,438.3561643836 |
Focal plane Y resolution | 4,445.9691252144 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Serial number of camera | 1940415065 |
Lens used | EF50mm f/2.5 Compact Macro |
Date metadata was last modified | 05:09, 4 March 2015 |
Unique ID of original document | 36A839A8E8FD99349CB1DEDDF77F4778 |