Stratified Rocks	Intrusive Rocks

Figure 4. Examples of geologic unit labels. Labels for stratified rocks are usually abbreviations of the age and formation of the rock. Oce - Ordovician Cape Elizabeth Formation. SOar - Silurian-Ordovician Appleton Ridge Formation. Labels for intrusive rocks are usually abbreviations of the age and type of rock. Dg - Devonian granite. DSbg - Devonian-Silurian biotite granite.

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Last updated on October 6, 2005

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