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During the Cambrian period, 600 mya, Georgia was part of the ocean floor. In fact, most of North America except Canada was under water. Evidence of this includes the presence of _____________________ rock as far as North Georgia, containing the fossils of marine organisms that had shells. The minerals in these rocks precipitated out of the seawater and combined with the shells of the organisms to form deposits.

A) basalt
B) granite
C) limestone ***********
D) sandstone

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Answered by Ms. Sue
Yes, limestone.
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