Grand Portal is the prominent point where we began our close-in tour of the Pictured Rocks, designated the country’s first national lakeshore in 1966. You can just make out the hollow area under this formation.
Massive glaciers inched back and forth across this land for a million years, scouring and molding the 500-million-year-old Cambrian sandstone, and pre-Cambrian Jacobsville sandstone.
The Gull Rookery shows the effects of centuries of onslaught by Lake Superior, where battering waves and ice continue to sculpt the cliffs.
Just in front of Jerry is Sail Rock, a triangular rock perched against the shore.
This shows streaks that occur when groundwater drips out of cracks, leaving behind the colorful stain of iron, manganese, limonite, copper and other minerals.
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