The limestone that elsewhere gives Iowa its hard mineralized water was obliterated and replaced by the shocked basement rocks that so puzzled the water driller in 1912.

今天，灰岩为艾奥瓦州的其他地方提供硬质矿泉水；而这里的灰岩却被砸得一干二净，由受到猛烈震动的基底岩石取而代之。正是这种岩石，1912年令那位钻井工人感到迷惑不解。