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PREFACE.
turbance acting from below, and worn and eroded by denuding agencies acting from above; fresh formations have been deposited over it, and these also with the subjacent rocks broken and again denuded, till all likeness of its former state has been utterly destroyed, and its former condition left to be guessed at solely by deductions drawn from the relations which can be traced between the formations of which it is composed.
J. Beete Jukes.
51, Stephen's Green, Dublin,
6th September 1859.
