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Audubon Naturalist Hour: Using Rock Dating to Determine the Age of Great Falls

  Using Rock Dating to Determine the Age of Great Falls Tuesday, March 23, 2021 at 7:00 pm Joe Marx Adjunct Professor in Geology, Northern Virginia Community College (NVCC) Geology Professor Joe Marx will explain how geologists determined a precise age for the Great Falls of the Potomac. Until about 20 years ago, the best estimate of the age of Great Falls was between "several tho...
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Audubon Naturalist Society – What’s Under the Topsoil

What’s Under the Topsoil October 8 at 6:00 pm Naomi Vega, PhD USDA – NRCS (Natural Resources Conservation Service) Soil Scientist Dr. Vega takes us on a discovery of the wide diversity of soils on earth. Witness the stories about the formation of a living environment told by the layers and colors under the topsoil and learn how geologic processes shaped the landscape. Regis...
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Audubon Naturalist Hour: Where is the Fall Line?

Where is the Fall Line? Thursday, July 9 • 1:00 pm Joe Marx, Geology Instructor, ANS Natural History Field Studies Nearly everyone in the DMV area has heard of the Fall Line, but few are certain of much more than the name. In this talk, we'll try to pin down this elusive physiographic feature. Register Here.
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