The Silurian area. One of the largest areas of uniform character to be found in Ulster is the undulating tract occupied by Silurian slates which includes the greater part of Down, Armagh, Monaghan, and Cavan (Bed and Breakfasts, Cavan, Ireland), and only gives way to the prevalent limestone of central Ireland when it reaches the banks of the Shannon. This area is usually hillocky, covered with boulder-clay, and highly tilled. For the botanist interest centres in the lakelets and marshes which occupy the innumerable hollows.
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