Sibley Peninsula

[2] Also on the peninsula are the Thunder Cape Bird Observatory, at its southern tip, and the small town of Silver Islet.

The highlands dominate the western half of the peninsula, and rise to 380 metres (1,247 ft) above the surface of Lake Superior.

The lowlands of the eastern portion of the peninsula rise to only 75 metres (246 ft), over an area 3 to 6 kilometres (1.9 to 3.7 mi) wide.

With the exception of diabase dikes and the large diabase sill that forms the upper portion of the Sleeping Giant, the peninsula is underlain by sedimentary rocks, which strike northeast and slope towards the southwest, forming a cuesta.

[1] Sibley Peninsula (pronounced Syb-Lee) has archaeological sites from Paleoindian, arachaic, and woodland settlements.