A glacial series is a special type of rock formation that happens when glaciers, which are big sheets of ice, move across the land and change the way it looks over a long period of time. Glaciers are really heavy and can carry big rocks, sand, and dirt with them.
When a glacier moves across the land, it can scrape the topsoil away and expose the solid rock underneath. The pressure from the glacier can also cause the rocks to break apart into smaller pieces. As the glacier melts and moves on, it leaves behind these broken rocks, sand, and dirt, which are called glacial sediment.
Over time, the sediment can be carried away by wind or water, leaving behind a layer of rocks that look really different from the surrounding landscape. These rocks have a smooth and polished appearance on one side, called a glacial polish, which was created from the friction and pressure of the glacier moving over it.
The rocks in a glacial series are usually arranged in layers, with bigger rocks at the bottom and smaller ones on top. The layers can also have different colors, depending on the type of rock that was picked up by the glacier.
In summary, a glacial series happens when a glacier moves across the land, carrying rocks and sediment with it. The rocks are left behind as the glacier melts and the sediment is carried away, leaving a unique and noticeable formation in the landscape.