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  2. Geology of Arkansas - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Arkansas

    The geology of Arkansas includes deep 1.4 billion year old igneous crystalline basement rock from the Proterozoic known only from boreholes, overlain by extensive sedimentary rocks and some volcanic rocks. The region was a shallow marine, riverine and coastal environment for much of the early Paleozoic as multi

  3. Geography of Arkansas - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Arkansas

    The land is adjacent to the Mississippi River and generally flat, fertile, swampy lands sometimes called the Arkansas delta. This region is sparsely populated, with an economy primarily driven by agriculture. The western side of Southeast Arkansas includes the Piney Woods, a region known for dense pine and cypress forests. Silviculture and ...

  4. Smackover Formation - Wikipedia

    en.wikipedia.org/wiki/Smackover_Formation

    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.

  5. List of ecoregions in Arkansas - Wikipedia

    en.wikipedia.org/wiki/List_of_ecoregions_in_Arkansas

    Level III subdivides the continent into 182 ecoregions; of these, seven lay partly within Arkansas's borders. Level IV is a further subdivision of Level III ecoregions. There are 32 Level IV ecoregions in Arkansas, [2] many of which continue into adjacent areas in the neighboring states of Oklahoma, Mississippi, Missouri, Louisiana, Tennessee ...

  6. Moorefield Formation - Wikipedia

    en.wikipedia.org/wiki/Moorefield_Formation

    The Moorefield Formation, or Moorefield Shale, is a geologic formation in northern Arkansas and eastern Oklahoma that dates to the Meramecian Series of the middle Mississippian. In Arkansas, this formation is generally recognized to have one member, the Ruddell Shale, in the upper Moorefield Formation.

  7. Bloyd Formation - Wikipedia

    en.wikipedia.org/wiki/Bloyd_Formation

    Region: Arkansas: Country: United States ... The Bloyd Formation, or Bloyd Shale, is a geologic formation in Arkansas. ... In the eastern parts of the Ozarks in ...

  8. Taylor Group - Wikipedia

    en.wikipedia.org/wiki/Taylor_Group

    Region: Arkansas: Country: United States: ... The Taylor Group is a geologic group in Arkansas. It preserves fossils dating back to the Cretaceous period. See also

  9. St. Joe Formation - Wikipedia

    en.wikipedia.org/wiki/St._Joe_Formation

    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 .

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