Abstract
The "cryptovolcanic structures" of central North America have been explained as due to "volcanic" explosion (Bucher) and meteorite impact (Dietz), but an alternative explanation is possible. If the hydraulic pressure of water and other fluids contained in a permeable formation should locally exceed the lithostatic pressure, the overlying strata would be lifted into an arch, but the fluid would rapidly escape and the arch would then collapse, producing the chaotic structure and the shatter cones observed.
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