Assertion: aquifer's layer | /r/HasProperty | aquitard
Facets:
Source sentences:
text: Typically (but not always) the shallowest aquifer at a given location is unconfined, meaning it does not have a confining layer (an aquitard or aquiclude) between it and the surface.
text: This aquifer lies above a fine-grained layer of shale (this layer is called an aquitard because it restricts movement of water between aquifers).
text: Aquifers occurring in layered sediments or sedimentary rocks are in many cases separated by less conductive layers known as aquitards.
text: Such layers are referred to as aquitards or aquicludes.