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The isle of Eotia was formed from intense volcanic activity about 13 million years ago in the late Miocene period. The highest Peak, Mt Eotia (‘the mount of time’) is the remnant magma plug from the original volcano and dominates the landscape. Its twin sister, Mt Harrison (locally known as ‘Lookout Peak’) a lies a little further to the south separated by a deep saddle. To the southwest of Mt Harrison, a large, distinctive caldera has been formed from rapid erosion of the western slope by the steep rivers running into the sea and general weathering of the land mass. This has subsequently formed Lake at the End of Time, a large, natural freshwater lake used as a source of water. Large, rounded, rhyolitic (micro-granite) tors which originally formed part of the exposed magma chamber at the base of Mt. Eotia can be found on the North West corner of the Crow Plateau.

The reduction of volcanic mass caused by erosion of the lava flows have have caused the lightened crust of the planet to rise slightly so that the downslope rivers from the original shield volcano have become deeply etched into the landscape with distinctive mountain and valley tracts and have virtually no flood plain. This is evident, most particularly, in the valley of Serpentine Creek which enters the sea to the north west of Mt Eotia. Two small but deep vents on the northern side of the original volcano provide a source of natural spring water. The northernmost and lower of these two of these feeding the headwaters of Serpentine Creek is a hot spring and the water is naturally carbonated. There is a strong and curious magnetic anomaly situated to the north of Mt Eotia which is not associated with iron ore or loadstone deposits.