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The Smackover Formation is a geologic formation that extends under parts of Arkansas, Louisiana, Texas, Alabama, Mississippi, and Florida. [1] It preserves fossils dating back to the Jurassic period. The formation is a relic of an ancient sea that left an extensive, porous, and permeable limestone geologic unit.
The St. Clair Limestone is a geologic unit in Arkansas, and Oklahoma. It is classified as a Geologic Member in Indiana and Missouri. It dates back to the Middle of Silurian period. It is high density, high magnesium dolomitic limestone. [2]
In the Ozarks, sphalerite is often found near faults in Paleozoic limestone and dolomite. In addition to copper, there are numerous iron minerals, but few with economic deposits. Two small pig iron furnaces operated in the 1800s and a tiny open pit mine in the 1960s, near Rosston, Arkansas extracting only a few hundred
The Clifty Limestone is a Middle Devonian geologic formation in the Ozark Plateaus of Arkansas. This thin formation can but up to 4 feet thick. [ 3 ] The name was introduced in 1916 by Albert Homer Purdue and Hugh Dinsmore Miser in their study of northern Arkansas.
The Chepultepec Formation is a primarily limestone and dolomite formation, the earliest formation of the Ordovician period in its area. Further north, it is equivalent to the Stonehenge Formation of the Beekmantown Group. [12] The formation was first described from Allgood, and has also been found in Tennessee and Virginia. [13]
The Pitkin Formation, or Pitkin Limestone, is a fossiliferous geologic formation in northern Arkansas that dates to the Chesterian Series of the late Mississippian. [4] This formation was first named the "Archimedes Limestone" by David Dale Owen in 1858, but was replaced in 1904. [ 3 ]
The St. Joe Formation or St. Joe Limestone Member is a geologic formation or member in northern Arkansas, southern Missouri and northeastern Oklahoma. [1] It preserves fossils of the Mississippian subperiod including crinoids , brachiopods , bryozoa , conodonts , blastoids , ostracods and rugose coral .
The Kimmswick Limestone is an Ordovician geologic formation in Arkansas, Illinois and Missouri. Fossils occurring in the Kimmswick include corals , bryozoans , brachiopods , conodonts , [ 4 ] trilobites , crinoids and mollusks .