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On an expedition, how do you know where to dig for fossils?
Expedition members search for fossils in the Gobi Desert.
Mark and the team spend many hours scouring the ground for traces of fossilized bone.
 

Finding the right spot takes lots of experience and luck. Before we go, we research the place we're planning to dig to about the age and type of the rocks. At the site, we spend many hours looking for bits of exposed bone. When we think we've found a specimen, we carefully explore the area using dental tools and small brushes. If we think we've found something, then our excavation team comes to help us. We usually cut out a large piece of rock with the fossil inside it, so we don't damage the fossil. Then, we transport it back to the Museum to prepare it for research.