An impermeable geologic formation or stratum which will not hold or transmit fluid.
An impermeable body of rock that may absorb water slowly but does not transmit it.
A subsurface rock, soil or sediment unit that does not yield useful quanties of water.
Rock formations that are impermeable to groundwater water.
aquiclude An impermeable body of rock or stratum of sediment that acts as a barrier to the flow of groundwater.
An impermeable layer of rock which water cannot flow through because there are no pore or fracture voids, or such voids are not connected together.
any geological formation that absorbs and holds water but does not transmit it at a sufficient rate to supply springs, wells, etc.