The most common rock formation in the watershed of Bowman Creek is the Catskill Formation, which occupies most of the eastern part of the watershed. Further to the west, there is a sizable band of the Huntley Mountain Formation, which also occurs in a few small patches further to the east. On the westernmost and southwesternmost fringe of the watershed, there is a band of Burgoon Sandstone. Other rock formations occupy far smaller areas. The Mauch Chunk Formation occurs in a few tiny patches along the western and southwestern edges of the watershed, and one tiny patch of the Pottsville Group occurs on the watershed's western edge as well. In the northern part of the creek's watershed, there are four small patches of the Pocono Formation.