Abstract
Much of the present drainage of central and east-central Donegal is welladjusted to the structures and outcrop-patterns of the Main Donegal Granite, the Barnesmore Granite, or the surrounding metasediments. When allowance is made for more than twenty glacial breaches, which displaced watersheds by as much as two miles and lowered them by as much as 800 feet, a simple pre-glacial divide can be reconstructed which cuts across the geological grain. Reconstructed consequent streams flowing eastward and westward from the main divide had been modified by capture and abstraction before glacial diversion took place. Sub-parallel consequents draining to the east indicate superimposition and suggest Tertiary deformation, without making clear the nature of any unconformable cover.
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