Debolt Formation
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| Debolt Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Rundle Group |
| Sub-units | Upper Debolt Lower Debolt |
| Underlies | Golata Formation |
| Overlies | Shunda Formation |
| Thickness | up to 366 metres (1,200 ft)[1] |
| Lithology | |
| Primary | Limestone, dolomite |
| Other | Shale, anhydrite |
| Location | |
| Coordinates | 55°18′21″N 117°53′46″W / 55.3057°N 117.8961°W |
| Region | Alberta, British Columbia |
| Country | Canada |
| Type section | |
| Named for | Debolt, Alberta |
| Named by | G. Macauley, 1958 |
The Debolt Formation is a stratigraphic unit of Meramecian age in the Western Canadian Sedimentary Basin.
It takes the name from the hamlet of Debolt, Alberta, and was first described in the Amerada Crown GF23-11 well near Debolt by G. Macauley in 1958.[2]
The Debolt Formation is commonly subdivided into a lower and upper unit. Lower Debolt rocks are bioclastic limestones deposited on a stable carbonate ramp. These lower Debolt rocks are rarely dolomitized and therefore have little porosity or commercial use. Upper Debolt sedimentation is characterized by a number of shallowing upwards facies. At the base of the Upper Debolt is distal and medial ramp argillaceous limestone facies with limited laminations and thin bedding. These argillaceous facies rarely contain clean carbonate interbeds in the medial ramp setting, predominantly wackestones and packstones. These facies are followed by a capping proximal ramp/shoal facies with abundant skeletal packstones and grainstones.[3]