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Description: | The small circular shapes on the surface of this piece of rock were made by hailstones that formed during a volcanic eruption, approximately 450 million years ago. We can see where the hailstones fell on this rock, because they were coated with dust from the volcano. It is this dust that has made the pale round marks. Therefore, in a way, these are fossil hailstones! | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | rocks and minerals natural world | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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