Рет қаралды 4,600
An introduction to folds on maps - using William Smith’s 1815 original and the State Geologic Map of Pennsylvania. We'll see how to spot folds and then to trace them out - gaining understanding of how rock layers project into the subsurface - and how they continued above ground before being partially eroded away! Part of "The Shear Zone" video channel. Copies of the maps are available on the Shear Zone website (see link from Channel home page).