Schematic Maps and Cross Sections of Intrusion of Birch Creek Pluton, Nos. 4-6. Black polygon outlines eventual outcrop area of pluton. Green/Gray = Wyman Formation; Yellow = Reed Formation; Blue = Deep Spring Formation; Orange = Campito Formation; Red = granite. A-A' is line of cross section. Horizontal line is present level of erosion. |
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| 4. Granite continued to expand upward and into the core of the pluton, further overturning and stretching the Reed Formation. | 5. Granite filled its eventual space. | 6. Map of the present form of the pluton and the deformed rock units in the anticline. |