A subsurface rock layer that is composed of clay and represents a barrier to flow would be described as a(n):

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A subsurface rock layer that is composed of clay and represents a barrier to flow is known as an aquiclude. An aquiclude restricts the flow of water, and is often used by geologists and hydrologists when analyzing the properties of subsurface materials. In contrast, an aquifer is a layer of rock or sediment that can transmit water to wells or springs, a geyser is a natural hot spring that periodically erupts, an oxbow lake is a U-shaped body of water created when a meandering river becomes isolated from its main channel, and a spring is a point at which groundwater flows from the ground onto the surface.

A Subsurface Rock Layer That Is Composed of Clay and Represents