Jarrod Burks and Robert Cook were able to identify and map a largely buried and hidden earthwork in Ohio through the use of:

Name: Jarrod Burks and Robert Cook were able to identify and map a largely buried and hidden earthwork in Ohio through the use of:
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Question

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Jarrod Burks and Robert Cook used a fluxgate gradiometer, a geophysical survey instrument that measures tiny variations in the Earth's magnetic field, to identify and map the buried earthwork in Ohio.

Jarrod Burks and Robert Cook Were Able to Identify and Map