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.
Although much of the Springfield Plateau has been denuded of the surface layers of the Boston Mountains, large remnants of these younger layers are present throughout the southern end of the formation, possibly suggesting a peneplain process.
The seas encroached during the late Cambrian producing the Lamotte Sandstone, 200 to 300 feet (61 to 91 m) thick, followed by carbonate sedimentation.
Coral reefs formed around the granite and rhyolite islands in this Cambrian sea.
There are two mountain ranges within the Ozarks: the Boston Mountains of Arkansas and the St. Buffalo Lookout, the highest point in the Ozarks, is located in the Boston Mountains.
Geologically, the area is a broad dome with the exposed core in the St. The Ozarks cover nearly 47,000 square miles, making it the most extensive highland region between the Appalachians and Rockies. in the decades prior to the French and Indian War, aux Arkansas originally referring to the trading post at Arkansas Post, located in wooded Arkansas Delta lowland area above the confluence of the Arkansas River with the Mississippi River.
This carbonate formation, the Bonneterre now mostly dolomite, is exposed around the St.