Geologists often walk along rocky beaches near the town of Glenafric on the South Island of New Zealand. These scientists look for large gray rocks called concretions. When one of these rocks is located it is first gently examined, and then promptly given a resounding blow with a hammer. Often just a single strike is enough to break the rock apart to reveal the fossil remains of a large fossil crab inside. These crabs are known as Tumindocarcinus giganteus and are over 12 million years old.
The Children's Museum of Indianapolis
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Fossils -- New Zealand
Paleontology -- Miocene
Further information on this record can be found at its source.