Crystal Mountain Sandstone Explained

Crystal Mountain Sandstone
Type:	Formation
Age:	Ordovician
Prilithology:	Sandstone
Namedfor:	Crystal Mountains, Montgomery County, Arkansas
Namedby:	Albert Homer Purdue^[1] ^[2]
Region:	Arkansas, Oklahoma
Country:	United States
Unitof:	none
Subunits:	none
Underlies:	Mazarn Shale
Overlies:	Collier Shale
Thickness:	500 to 800 feet^[3]

The Crystal Mountain Sandstone is an Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. This interval was first described in 1892,^[4] but remained unnamed until 1909 as part of a study on the Ouachita Mountains of Arkansas by Albert Homer Purdue.^{[1] [2]}

See also

• List of fossiliferous stratigraphic units in Arkansas
• Paleontology in Arkansas

Notes and References

1. Book: Purdue. A.H.. Slates of Arkansas. 1909. Geological Survey of Arkansas. 30, 32.
2. Purdue. A.H.. Structure and stratigraphy of the Ouachita Ordovician area (abstract). Geological Society of America Bulletin. 1909. 19. 557. 10.1130/GSAB-19-513.
3. McFarland. John David. Stratigraphic summary of Arkansas. Arkansas Geological Commission Information Circular. 2004. 1998. 36. 18. 2018-01-05. https://web.archive.org/web/20161221195953/http://www.geology.ar.gov/pdf/IC-36_v.pdf. 2016-12-21. dead.
4. Griswold. I.S.. Whetstones and the novaculites. Annual Report of the Geological Survey of Arkansas for 1890. 1892. 3.