Thousand Islands – Frontenac Arch is one of four ecoregions of the Mixedwood Plains. The Thousand Islands in the Saint Lawrence River have a distinctive flora and fauna and are a part of the biological corridor. The bedrock is mostly gneiss, granite and marble, more than a billion years old. The Frontenac terrain is the youngest of the Ontario portions of the arch, dated at 1.2 billion years old. These rocks were once part of a large mountain chain of the ancient supercontinent of Rodinia. There is also a meteor crater near Holleford, where the shield meets the limestone plains of southeastern Ontario. The area
Thousand Islands Railway Thousand Islands Railway The Thousand Islands Railway (originally Gananoque & Rideau Railway) was an long railway running from the town of Gananoque north to the Grand Trunk Railway (now CN) Toronto-Montreal mainline, just south of present-day Cheeseborough. The service ran for 111 years between 1884 and 1995. The rails were removed in October 1997. The railway was originally incorporated as Gananoque & Rideau Railway on 15 February 1871, but construction did not begin until 1883 due to lack of money. The town provided tax breaks and $10,000 in debenture financing to Rathbun's Bay of Quinte Railway and Navigation Company to