This is the unique feature on the summit ridge ("Window") that is often discussed in regards to the Mount Tyrwhitt scramble. Once you know it is there, it can be seen from quite the distance. Kananaskis Country, Canadian Rockies- 2003
This shows the steep northeast face of Tyrwhitt and was taken from Tyrwhitt Basin while hunting for fossils.
Mount Tyrwhitt is an enjoyable moderate scramble which affords excellent views of the Misty Range and Elk Valley. If you are up the Highwood Pass way try this one out. The Rock Arch that you pass along the scramble is clearly visible at the middle left along the flatter area just below the summit ridge, and Grizzly col is just out of the picture to the left.
The basin below Tyrwhitt is an excellent place to find fossils. In fact, the day Amy and I were up there with our son Brydon we found several excellent pieces of rock with Tube Corals in them and horn corals.