Earth:Blakely Sandstone
| Blakely Sandstone Stratigraphic range: Ordovician | |
|---|---|
_(8290507503).jpg) Blakely Sandstone (Coleman Quartz Mine, Arkansas) | |
| Type | Formation |
| Unit of | none |
| Sub-units | none |
| Underlies | Womble Shale |
| Overlies | Mazarn Shale |
| Thickness | up to 700 feet[1] |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Blakely Mountain, Garland County, Arkansas |
| Named by | Albert Homer Purdue[2] |
The Blakely Sandstone is a Middle Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892,[3] this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas. Purdue had initially named this unit the Caddo Shale at a 1907 Geological Society of America meeting,[4] but later redefined and renamed the unit as the Ouachita Shale.[5] He again renamed the unit to the Blakely Sandstone in a letter to Edward Oscar Ulrich, to which Ulrich used in a 1911 publication, becoming the first reference using this name.[2] Ulrich assigned the Blakely Mountain in Garland County, Arkansas as the type locality, but did not designate a stratotype. As of 2017, a reference section for this unit has yet to be designated.
Paleofauna
- C. horridus[6]
- Hisiodella
- H. holodentata[6]
- Leptochirognathus
- L. quadratus[6]
- Paraprioniodus
- P. costatus[6]
- P. aculeatus[6]
- Glossograptus
See also
- List of fossiliferous stratigraphic units in Arkansas
- Paleontology in Arkansas
References
- ↑ McFarland, John David (2004). "Stratigraphic summary of Arkansas". Arkansas Geological Commission Information Circular 36: 19. http://geology.ar.gov/pdf/IC-36_v.pdf. Retrieved 2018-01-08.
- ↑ 2.0 2.1 Ulrich, E.O. (1911). "Revision of the Paleozoic systems". Bulletin of the Geological Society of America 22 (1): 677. doi:10.1130/GSAB-22-281. Bibcode: 1911GSAB...22..281U.
- ↑ Griswold, L.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890 3.
- ↑ Purdue, A.H. (1909). "Structure and stratigraphy of the Ouachita Ordovician area, Arkansas (abstract)". Geological Society of America Bulletin 19: 557. doi:10.1130/GSAB-19-513. https://zenodo.org/record/1716453.
- ↑ Purdue, A.H. (1909). Slates of Arkansas. Geological Survey of Arkansas.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Ethington, R.L.; Finney, S.C.; Repetski, J.E. (1989). Biostratigraphy of the Paleozoic rocks of the Ouachita orogen, Arkansas, Oklahoma, west Texas. https://www.researchgate.net/publication/307560387.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Miser, Hugh D.; Purdue, A.H. (1929). "Geology of the De Queen and Caddo Gap quadrangles, Arkansas". U.S. Geological Survey Bulletin 808: 30–31. https://pubs.usgs.gov/bul/0808/report.pdf.
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