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It is typically found conformally overlying the Marcellus Formation, and underlying the Tully Limestone (where present). The Mahantango has been divided into four members: 1  Tully Limestone: a fossiliferous calcaerous shale. 2  The Tully is a conspicuous formation, which separates the Mahantango from the Hamilton Group.3  Sherman Ridge: Olive gray, fossiliferous, claystone and siltstone with interbedded fine sandstones coarsening upward.t is named for the North branch of the Mahantango Creek in Perry and Juniata counties in Pennsylvania. It is a member of the Hamilton Group, along with the underlying the Marcellus Formation Shale.
A demonstration of the features formed by water drainage in limestone areas, both at the surface and underground. Permeable and impermeable layers of rock in the Malham area give rise to intermittent drainage. We see features formed both at the surface and underground.Surface water passes over impermeable rock until it reaches permeable limestone. The water passes through the limestone and erodes it to form swallow holes.Gaping Gill is a swallow hole where water has eroded a cave to form the highest waterfall in Britain.The water continues to flow underground until the limestone meets impermeable rock at the valley floor. Here there is a resurgence where the water returns to the surface.Shake holes and water sinks are also formed by the flow of surface water.e see features formed both at the surface and underground. Surface water passes over impermeable rock until it reaches permeable limestone. The water passes through the limestone and erodes it to form swallow holes.