The Mid-Appalachian Shale Barrens

The mid‑Appalachian shale barrens are one of the rarest ecosystems on the planet — found only in Virginia, West Virginia, Maryland, and Pennsylvania. Perched on the steep, south‑facing slopes of the Ridge and Valley Province, these barrens form where thin soils, crumbling Devonian shale, and intense solar exposure combine to create an environment so harsh it resembles a desert more than an eastern forest.

Out of these extreme conditions emerges a community of drought‑tolerant, heat‑adapted, and highly specialized species, including plants found nowhere else on Earth.

This talk explores the natural history of the mid‑Appalachian shale barrens, the geologic forces that shape them, and the remarkable suite of rare and endemic species that call these fragile habitats home.

Bio: Clara Thiel is a lecturer of Biology at Frostburg State University, where she teaches courses in plant taxonomy, forest ecology, and economic botany.  She is the curator of the Frostburg State University Herbarium and coordinates the Interpretive Biology & Natural History program. Her research interests include rare plants and ecosystems of the mid-Atlantic region, with current work focusing on pollination dynamics of the mid-Appalachian shale barrens.