A look through the valley, which I'm lead to believe is a glacial hanging valley.
These were created because they had a different rate of glacial erosion from that of the main valley. The floors of these hanging valleys were eroded and deepened more slowly than the main valley, so the difference between the depths of the two valleys steadily increased over time. As a result, the hanging valleys are left high above the main valley floor. The rivers and streams enter the main valley by a series of small waterfalls or a single much larger fall.
I'm not the expert, I just think it's interesting so I copied it from a book for you.