The most striking geological feature at Powers Bluff is the stone outcrops poking out the top of the hill. In some places they rise 25 feet above the forest floor. The bluff is
quartzite with a peak of
chert. Geologists believe the quartzite to be from the
Proterozoic era, 1.6 billion years old, similar in age and composition to
Rib Mountain to the northeast and the
Baraboo Hills to the south, and much older than the
Himalayas. The quartzite is pretty pink, a semi-precious stone, and very hard. The softer materials which once surrounded it have been gradually stripped away by erosion, leaving the bluff. Boulders and pebbles of the unusual chert from Powers Bluff are concentrated in a fan shape with its point at Powers Bluff and spreading to the southeast for 20 km, almost to the west side of
Rapids. This indicates that a
glacier once moved over the bluff heading southeast, breaking off stones and carrying them for miles. Most of the bluff is covered by
mesic forest dominated by
sugar maples - some very old and large. Beneath the trees, spring wildflowers begin to bloom around the second week of April, with
mayflowers and
Dutchman's breeches plentiful, and some
spring beauties,
trout lilies, and
wild oats eventually giving way to
trilliums. During summer, ferns and
blue cohosh grow in the shade. The maples turn red and yellow around the start of October, and soon the forest floor is blanketed in leaves.
Gray squirrels,
chipmunks, and
white-tailed deer are commonly seen on the bluff. == Human history ==