File:Areas of Critical Environmental Concern (15487502890).jpg
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Summary
editDescriptionAreas of Critical Environmental Concern (15487502890).jpg |
Ringing Rocks ACEC, BLM Montana/Dakotas Butte Field Office in the Western Montana District Areas of Critical Environmental Concern or ACECs are special designations unique to the BLM. These areas require special management beyond what is normally required to protect significant historic, cultural, scenic, other values with locally significant qualities, or natural hazards. These qualities range from irreplaceable resources to something that might be extremely rare. The Federal Land Policy and Management Act of 1976 requires BLM to review nominations of ACECs during the planning process. One example of an ACEC that is both rare and distinctive is the Ringing Rocks ACEC managed by the BLM Montana/Dakotas Butte Field Office in the Western Montana District. The Ringing Rocks ACEC is a geologic feature resulting from a combination of chemical composition and joining patterns which cause the rocks to chime when struck. Rocks removed from the formation do not ring. The only other ringing rocks formation known in the United States is located in Pennsylvania. No ACEC is exactly alike so each ACEC has its own unique management direction that protects the resource but still recognizes BLM’s Multiple Use Sustained Yield mission. The management of an ACEC is usually described in a Field Office Resource Management Plan (RMP). To protect the unique features of the Ringing Rocks ACEC the BLM Butte Field Office has added interpretative information to the site to help educate visitors about the importance of the rock features, reclaimed an old abandoned mine shaft, and prohibited the removal of these unique rocks from the area. The 160-acre site was also withdrawn from mineral entry in 1965. These special management decisions are all found in the Butte Field Office RMP and ensure future generations will enjoy the unique geographic feature found on this irreplaceable piece of BLM-managed public land. |
Date | |
Source | Areas of Critical Environmental Concern |
Author | Bureau of Land Management |
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This image was originally posted to Flickr by mypubliclands at https://flickr.com/photos/91981596@N06/15487502890. It was reviewed on 4 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 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 |
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current | 19:33, 4 August 2015 | 4,000 × 3,000 (4.86 MB) | Wilfredor (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | NIKON |
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Camera model | COOLPIX P90 |
Exposure time | 1/200 sec (0.005) |
F-number | f/4.5 |
ISO speed rating | 64 |
Date and time of data generation | 14:21, 22 April 2014 |
Lens focal length | 7.3 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | COOLPIX P90V1.0 |
File change date and time | 14:21, 22 April 2014 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 14:21, 22 April 2014 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 41 mm |
Scene capture type | Standard |
Scene control | None |
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Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |