Explain why the author and his colleagues chose to focus on 375 million year old rocks in their search for fossils. Be sure to include the types of rocks and their location during their paleontology work in 2004. 

Neil Shubin and his colleagues decided to focus on 375 million year old rocks in their search for fossils because they believed that those amphibians which were different from fish were identified within the 365 million year old rocks. They researched sedimentary rocks because it was the most helpful type of rock to finding fossils. Neil Shubin and his colleagues searched for fossils on Ellesmere Island in northern Canada in 2004 because of its human absence and abundance of trees surrounding the are.

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