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The remarkable circular basins of Wallace and Sherman counties, Kansas, have been explained as being due to the collapse of the walls of solution cavities dissolved by artesian waters flowing through the Smoky Hill chalk. Evidence recently gathered by the writer indicates that this theory is untenable, because of the impervious and relatively insoluble nature of the "chalk," and because the solution could take place only at the outcrop. It is concluded that the subsidences are formed by the collapse of the walls of voids produced during the deformation and fracturing of the "chalk."
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