The ‘deep stage’ is used to describe the portion of the Teays Valley and other proglacial valleys carved into bedrock in the Great Lakes region. This includes Ohio Valley, near Madison, Indiana, before the Pleistocene;[15] the Wabash Valley; and the Mississippi Valley. The floor of the Teays Valley in West Virginia is 200 feet (61 m) above the entrenched Kanawha and Ohio valley floors, and its bedrock floor is at least 15 feet (4.6 m) above them.