Slate Islands, Island group in Thunder Bay District, Canada
The Slate Islands are a group of 15 islands in Lake Superior near Terrace Bay. They form an important geological site known for its distinctive rock formations and layered structure.
The islands were shaped around 450 million years ago by a meteorite impact that left deep marks in the earth's crust. The protected area was established in 1985 to preserve these geological features.
The Patterson Island lighthouse, constructed in 1903, received its name from Saskatchewan lieutenant-governor William Patterson and marks maritime navigation in the area.
Access to the islands is only by boat or floatplane, which requires some planning ahead. Visitors can use a small number of campsites and a dock for overnight visits.
The location contains evidence of a massive impact crater with visible shatter cones and transformed rock. The rock itself is over 2.7 billion years old, revealing deep geological time.
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