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Although the Springfield formation's surface is primarily Mississippian limestone and chert, the Salem Plateau is older Ordovician dolostones, limestones, and sandstones.Both are rife with karst topography and form long, flat plains.
Eventually, the term came to refer to all Ozark Plateau drainage into the Arkansas and Missouri Rivers.
Many Ozark waterways have their headwaters in the uplands of the Boston formation, including the Buffalo, King’s, Mulberry, Little Red and White rivers.
Topography is mostly gently rolling in the Springfield and Salem Plateaus, whereas the Saint Francois Mountains are more rugged.
The Saint Francois Mountains in the northeastern Ozarks are the eroded remnants of an ancient range which form the geological core of the highland dome.
The igneous and volcanic rocks of the Saint Francois Mountains are the exposed remains of a Proterozoic mountain range hundreds of millions of years old.
The Ouachita Mountains to the south rise a few hundred feet higher, but are not geographically associated with the Ozarks.