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Office of the State Geologist Blog

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This beautiful sample was recently collected from Pulaski County and donated because of the rare crystal shapes of the minerals. This cavity, or vug, was found in an igneous dike in the Jackfork Formation. The photos below are magnified to show the crystal shapes. Notice the shape of the white calcite crystals that resemble poker […]


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The most detailed geology available for the area to the southeast is from the 1:500,000-scale Geologic Map of Arkansas (Haley et al., 1993). To the northwest, 1:24,000-scale geologic mapping done for STATEMAP and the Earth Mapping Resources Initiative over the past 25 years has superseded it. The difference in detail is obvious.


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We’d like to use today to highlight a field trip we had the opportunity to lead at the 2025 South-Central Geological Society of America section meeting. Multiple participants were led to historic mines in the north-central Arkansas lead and zinc district. There are 108 mines in this district with historic production of approximately 8250 tons […]


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Today we are highlighting Fossilized Oysters This fossil oyster is a type of mollusk that has two valves connected by a hinge and is commonly called a bivalve. Bivalves are categorized as clams, oysters, and scallops based on their shell or valve shapes. In oysters, the left shell, which is attached to the sea floor, […]


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Today is Earth Observation Day of Earth Science Week! To celebrate, we’d like to share an example of how geologists at the OSG used remote sensing in a recent project. For the past couple years, the OSG, in cooperation with the Arkansas Mining Program, has used historic documents and remote sensing data to locate abandoned […]


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