It is probable that at a period of time very far distant, the ground about “Fort Hill” was, for some considerable distance around, entirely of the same level, and that by the action of water, a change took place, which brought about the present condition. The low land immediately in front to the north, is only the remains of a water course, which was made up of a stream coming down the gorge of the west side, and the present “Allen’s creek,” which flows through a portion of the gorge of the east side, the stream of the west having been a branch of that of the east side. Through the west gorge now flows, in the wet season, a moderate stream, coming from the lands above the gorge, and having an interrupted fall of some forty or fifty feet; while “Allen’s creek” occupies a portion of the eastern gorge, much broader, at the extremity of which, some half a mile from the “Hill,” there is a beautiful fall of eighty feet perpendicularly. The structure of the “Hill” bears out this construction; it being composed of the same rock—with the exception of the upper strata—as the falls. At the falls the upper strata of rock and that which forms the bed of the creek for some two miles or more east, is the _corniferous limestone_; underlaying which are _hydraulic_ and _Onondaga limestones_. The two latter are only seen at “Fort Hill,” covered by a few feet of soil and several small masses of stone, a part out of place, among which are a few of _Medina sandstone_. The strata are, therefore continuous from the falls, and at some former periods, extended over the gorges, and formed a regular and nearly level surface, the action of water having removed, which has left the broad and conspicuous point of “Fort Hill,” as memorable monuments of the earlier condition of the country. When “Fort Hill” was used as a fortification the summit was entrenched. Forty years ago an entrenchment, ten feet deep and some twelve or fifteen wide, extended from the west to the east end, along the north or front part, and continued up each side about twenty rods, where it crossed over and joining, made the circuit of entrenchment complete. At this day a portion of this entrenchment is easily perceived for fifteen rods along the extreme western half of the north or front part, the cultivation of the soil, with other causes, having nearly obliterated all other portions. It would seem that this fortification was arranged more for protection against invasion from the north than from any other quarter, this direction evidently being its most commanding position. Near the northwest corner have, at different times, been found collections of rounded stones of hard consistence, which are supposed to have been used as weapons of defence by the besieged against the besiegers.