The proposed construction of a submarine tunnel across the Straits
of Dover has led M. Boué, For. Mem. Geol. Soc., to point out the
probability that the English Channel has not been excavated by
water-action only; but owes its origin to one of the lines of
disturbance which have fissured this portion of the earth’s crust:
and taking this view of the case, the fissure probably still exists,
being merely filled with comparatively loose material, so as to prove
a serious obstacle to any attempt made to drive through it a submarine
tunnel.--_Proceedings of the Geological Society._