[3] This mountain is part of the Livingston Range, and is situated 1.5 mile east of the Continental Divide.

Precipitation runoff from the mountain drains to the Waterton River via Olson and Valentine Creeks.

This climate supports the remnant of an unnamed glacier on the northeast aspect below the summit.

[5] Like the mountains in Glacier National Park, Porcupine Ridge is composed of sedimentary rock laid down during the Precambrian to Jurassic periods.

Formed in shallow seas, this sedimentary rock was initially uplifted beginning 170 million years ago when the Lewis Overthrust fault pushed an enormous slab of precambrian rocks 3 mi (4.8 km) thick, 50 miles (80 km) wide and 160 miles (260 km) long over younger rock of the cretaceous period.