St John's Short Course motor-cycles with exhaust silencers, saddles, pedals and mud-guards. The startline was situated in St John's with the Short Course based on a number of public roads including the primary A1 Douglas to Peel road, A3 Castletown to Ramsey road and the primary A4 Peel to Kirk Michael "Coast Road". The highest point of the course was on the primary A3 Castletown to Ramsey Road at St John's Chapelon the Cronk-y-Voddy straight at 780 ft above sea level. Motor racing began on the Isle of Man in 1904 with the Gordon Bennett Trial and was originally restricted to touring cars. As
Geography of the Isle of Man the Ordovician period. There is a belt of younger Silurian rocks along the west coast between Niarbyl and Peel, and a small area of Devonian sandstones around Peel. A band of Carboniferous period rocks underlies part of the northern plain, but is nowhere seen at the surface; however similar age rocks do outcrop in the south between Castletown, Silverdale and Port St Mary. Permo-Triassic age rocks are known to lie beneath the Point of Ayre but, as with the rest of the northern plain, these rocks are concealed by substantial thicknesses of superficial deposits. The island has significant deposits of