File:Pottsville Group over Maxville Limestone (Black 17 Mine, White Cottage, Ohio, USA) 23 (31337759548).jpg
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[edit]DescriptionPottsville Group over Maxville Limestone (Black 17 Mine, White Cottage, Ohio, USA) 23 (31337759548).jpg |
The Maxville Limestone is the only Middle to Late Mississippian-aged stratigraphic unit in Ohio. Its outcrop belt is not extensive - it principally occurs in Muskingum County and Perry County in eastern and southeastern Ohio. The Maxville Formation can also be found as cobbles and pebbles in the basal Sharon Formation (Lower Pennsylvanian), which disconformably overlies Ohio's Mississippian rocks. Paleohills, or erosional outliers, of Maxville Limestone have also been identified. Shown here is an active underground limestone mine in Muskingum County. The mine targets Maxville Limestone and crushes it for use as road gravel, fill, rip-rap, and erosion-control blocks. Most limestone or dolostone mining operations are open-pit mines - quarries. This is an unusual example of subsurface quarrying - it started in 2010; this photo depicts the status of the site in September 2011. Available satellite imagery shows the area flooded from 2014 to the present. The dark-colored sedimentary rocks in the upper part of the photo are the Pottsville Group, an upper Lower Pennsylvanian to lower Middle Pennsylvanian succession of marine and nonmarine rocks dominated by mixed siliciclastics. The Pottsville also includes fossiliferous limestones, coals, and chert/flint horizons. A series of adits are present in a light-colored unit at the base of the quarry's high wall. This is the Maxville Limestone. The Pottsville-Maxville contact is a significant disconformity. Only diesel engines were allowed underground. At the time of this visit, the underground limestone mining went back 800 to 900 feet. There are 40'x60'-sized rooms back there, forming a checkerboard pattern. Stratigraphy: lower Pottsville Group (upper Lower Pennsylvanian) over Maxville Limestone (Middle to Upper Mississippian) Locality: Black 17 Mine (owned by Sidwell Materials, Incorporated), south of Route 22, just east of the town of White Cottage, central Newton Township, southwestern Muskingum County, eastern Ohio, USA (39° 52' 21.35" North latitude, 82° 04' 38.38" West longitude) |
Date | |
Source | Pottsville Group over Maxville Limestone (Black 17 Mine, White Cottage, Ohio, USA) 23 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31337759548 (archive). It was reviewed on 13 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 October 2019
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current | 18:07, 13 October 2019 | ![]() | 4,000 × 3,000 (6.68 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/250 sec (0.004) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 15:31, 27 September 2011 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 11:49, 9 October 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:31, 27 September 2011 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.96875 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Landscape |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 07:49, 9 October 2018 |
Unique ID of original document | 080A4100975F8982460E1F797BB21741 |