Bitihorn is a mountain in the southernmost outskirts of Jotunheimen, Norway. It is situated due west of national route 51, and is therefore a landmark for tourists following that popular route. The mountain is steep towards south and east, and there is a subtle change in the rock layers between the sparagmite foundation and the summit which consists of the much harder gabbro rock.
The summit is one of the southernmost outcrops of gabbro in the vicinity, and Bitihorn is therefore significantly higher than its neighbors to the south and east. Underneath the sparagmite layer, lies a layer of extremely nutritious slate, called phyllite. That layer and its subsequent plant cover is the reason for the many mountain pastures in the area.
It is also quite easy to see how the different rock layers have been pushed upon each other from a north-northwest direction, so that the northern slope is quite easy, whereas the southern (and in this case the eastern) is extremely steep. This can be seen in all the neighboring peaks, like Skyrifjell, Heklefjell and Olefjell.