Figure 11. Geologic map showing the key position of the Haskell Rock conglomerate (SOuc) between the older volcanic rocks of Ordovician age (Ouv) and the younger sandstone and slate of the Seboomook Formation (Ds), exposed along the East Branch. Later in the Devonian Period, the Katahdin granite (lower left) intruded as a molten mass, cutting across all earlier rock units. (Portion of Bedrock Geologic Map of Maine, by Osberg, Hussey, and Boone, 1985.)

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Last updated on October 24, 2005

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