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 (Cocoa Beach) (Sw.) Willd.), blolly ("Guapira discolor" (Spreng.) Little), black ironwood ("Krugiodendron ferreum"(Vahl) Urb.), twinberry ("Myrcianthes fragrans"(Sw.) McVaugh), white indigo-berry ("Randia aculeata" L.), saffron plumb ("Sideroxylon celastrinum"(Kunth) T. D. Penn.), and wild lime ("Zanthoxylum fagara" (L.) Sarg.). Many of these plants are not found farther north than Brevard County. The state of Florida and Cocoa Beach purchased the islands north of Minutemen Causeway in 1988. Acquisition of the remaining south islands was completed by 2007. These islands are managed as the Thousand Islands Conservation Area by Brevard County Environmentally Endangered Lands Program. Efforts to acquire the remaining privately held islands began in