Legend (geology/thermal_contours)

Glacial Till Aquifer Temperatures (0) Ozark Aquifer Temperatures (1) Ozark Confining Unit Temperatures (2) Precambrian Confining Unit Temperatures (3) Southeast Lowlands Aquifer Temperatures (4) Springfield Plateau Aquifer Temperatures (5) St. Francois Aquifer Temperatures (6) St. Francois Confining Unit Temperatures (7) Western Interior Plains Confining System Temperatures (8)