Which group of formations differentiates deep wells from shallow wells in West Virginia?

The Onondaga formations serve as a significant geological marker in distinguishing deep wells from shallow wells in West Virginia. The Onondaga limestone, part of the classic Appalachian geology, is typically found at depths that classify a well as deep. Understanding the depth and characteristics of these formations is essential for determining where natural gas and oil resources can be effectively accessed.

In contrast, wells that are drilled into shallower formations usually interact with younger rock layers, such as those found in other formations listed. The identification of the boundaries created by these formations helps geologists and drillers assess the potential for resource extraction and plan their drilling operations accordingly. Hence, the Onondaga formations are a crucial aspect of this differentiation in West Virginia's oil and gas landscape.