Sugarloaf Mountain and Urca Hill Natural Monument Mountain, then an island, on 1 March 1565. The site was chosen to guard the entrance to Guanabara Bay, and the mountain was important as a signalling point. A landfill connected the island to the mainland in 1697, and various buildings were erected to defend the territory, but the Urca urban neighborhood was only built 300 years after the city was founded. The Sugarloaf Mountain and Urca Hill Natural Monument was created by the city of Rio de Janeiro by municipal decree 26578 of 1 June 2006. The objectives are to guarantee green spaces for leisure in a natural area,
Sugarloaf Mountain (Massachusetts) Mountain. There may be some truth to this tale; 15,000 years ago the Connecticut River from northern Vermont to southern Connecticut was post-glacial Lake Hitchcock. A now extinct species of giant beaver as big as black bears once inhabited North America at about the same time (see Pocumtuck Range for details). Sugarloaf Mountain, geologically contiguous with the Pocumtuck Ridge to the north, is composed of Triassic arkose sandstone and conglomerate. The Sugarloaf arkose was formed in a rift valley and sits in a half graben regionally called the Deerfield rift basin. The rift basin formed in Triassic-Jurassic time and is