Valley Fill Aquifers: The Irondogenesee aquifer is typical of valley-fill glacial aquifers deposited by meltwater streams that flowed toward the glacial ice in lowland valleys that were either partly or completely inundated later by large freshwater lakes; fine-grained glacial-lake sediments were deposited, at least partly, over the coarse-grained outwash that composes the aquifers.
