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What Are The Four Distinctive Eras

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The geologic history of Indiana is divided into four distinctive eras: the Precambrian, Paleozoic, Mesozoic and Cenozoic. These eras consists of different historical periods that define the evolution of rocks and life as we know it in Indiana. Beginning 650 million years ago, the Precambrian era, was very hot in temperature and molten; therefore, there was no life present. The most common rock type found during this era was igneous rocks, such as granite and marble. It was not until the Paleozoic era where life began to form throughout the marine seas. The Paleozoic was extremely complex and divided into 6 different periods: Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Located at the subsurface of Indiana, Cambrian sandstones,siltstones
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