Chelle Fisher, Ancient dolerite dyke at William Bay National Park. (PLACES WILDERNESS 2022)

The dolerite dyke you see here as bands along the rocky coast, is an igneous rock that if formed by magma but at a shallow depth. It intruded into the overlying granite in the Proterozoic era around 1500 million years ago when the first primitive life forms were emerging.

Images have been resized for web display, which may cause some loss of image quality. Note: Original high-resolution images are used for judging.