by Dick Hall-Sizemore
This yearโs Virginia Geological Field Conference was held in Radford the weekend before Election Day. Like the one I attended last year in the Mt. Rogers area, it was an opportunity to go back in time as well as get a brief respite from the drumbeat of politics.
The tenor of this conference was different from last yearโs, which focused on ancient rock formations and the forces that created them. There was a considerable amount of that kind of focus this year, as well. After all, these are geologists and that is what they do. However, the main focus was on the current effects of these geological forces and formations. The theme of the conference was โRocks, Water, and People: Establishing Connections Between Geological Processes, Water and Mineral Resources, and Human Activity in the New River Valley of Virginia.โ
The geology of the New River Valley is significantly different from that of the Mt. Rogers area. Mt. Rogers is part of the Blue Ridge physiographic province, dominated by granites and โbasement rock.โ The New River Valley is in the Valley and Ridge province, which encompasses the area west of the Blue Ridge to the West Virginia border, including a good part of Southwest Virginia.
The area that now constitutes the Valley and Ridge, along with most of the northeastern coast of the United States, began to form during the break-up (rifting) of the ancient supercontinent Rodinia about 800 million years ago. For about 500 million years, that tectonic plate drifted in ancient seas with much of it covered in fluctuating levels of water. As a result, some of the basement rock is still present, but the most prevalent geological formations are sedimentaryโsandstones, shale, limestone, and dolomite. These are the formations that have shaped the interconnections among rocks, water, and people.
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