The cliffs also expose clear views of volcanic dikes that cut upwards through the entire stratigraphy (sequence of volcanic layers) to the surface, where they fed lava to scoria cones — small, pointy ...
Step 2 Line bed with pond liner, ensuring there are no holes or gaps along edges and corners. Hold in position with bulldog clips. Step 3 Add 25mm of scoria to base of the bed. Step 4 Coil ...