Figure 9. Adjacent sections of the Bar Mills (left) and Old Orchard Beach (right) 7.5-minute bedrock geology maps. The Bar Mills map was published in 1995 and the Old Orchard Beach map in 2003. Note that the rocks identified as the Hutchins Corner Formation on the Bar Mills map are now identified as the Berwick Formation on the Old Orchard Beach quadrangle. The rocks themselves have not changed. However, changing views of regional stratigraphy have caused the rocks to be renamed the Berwick Formation. If the Bar Mills quadrangle was remapped today, the rocks labeled as Hutchins Corner Formation would be named Berwick Formation.

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Last updated on October 6, 2005

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