The tour starts at the waterfront in Cox’s Cove then crosses Middle Arm and turns northwest to follow the shore to North Arm Point. Along the way, we pass 7kms of layered sedimentary bedding from the continental margin of ancient North America, with folds, faults and tectonic thrusts formed by the closing of the Iapetus Ocean (precursor of the Atlantic Ocean) more than 400 million years ago. At Big Head these limestone pages of geological time reach a height of 200 meters (656ft) and represent millions of years of earth history. Rounding North Arm Point, the spectacular North Arm Hills come into view. This section of earth’s mantle was also forced to the surface by the closing of the Iapetus Ocean, where it oxidized to form rust-colored peridotite that’s inhospitable to most plant life. Pond Point at the southern tip of the massif (the only one that submerges directly into the ocean), is a popular spot for geologists, as the shoreline here exposes a polished section of metamorphic sole underlying the mantle as it was forced to the surface over sedimentary rock of the continental margin. At Stowbridges Point west of the North Arm Hills are large sections of pillow lava, formed approximately 500 million years ago when volcanoes erupted onto the floor of the Iapetus Ocean and cooled rapidly when exposed to water. Like many stretches of the Bay of Islands, it is protected by a pair of bald eagles, nesting atop a 15 meter high sea stack. If weather permits, the tour will return via the west side of Eagle Island, where gulls nest from late spring until early summer, and where the sedimentary rock is a bright red from traces of iron, a trait it has in common with the rusted mantle of the North Arm Hills.
North Arm Geological Wonder
Three Hour Guided Tour
This Three hour guided boat tour gives you a chance to see the North Am Geological Site, drop a line for a cod fish and tour the bay of islands. See the local wildlife such as bald eagles, whales dolphins, gannets, waterfalls, seals and the great scenery around the Bay of Islands $400 for up to 4 people