A 1 billion-year-old crack in Earth’s crust has created some of Michigan’s most iconic landscapes, including parts of Lake Superior and Isle Royale. The break occurred when the Midcontinent Rift basin, a geological fault line, split apart, forming ancient inland seas that later filled with water to become the lake.
This fissure is visible in Pictured Rocks National Lakeshore, where layered sediment from these ancient seas has been sculpted into colorful sandstone cliffs and distinctive archways. The unique landscape of Lake Superior’s shoreline owes its existence to this ancient crack, shaped by millions of years of geological activity.
Source: https://thesuntimesnews.com/tag/mishipeshu