Anyone who has driven across Iowa knows that the state is dominated by agriculture. But among the fields lined with corn, soybean, and livestock, a new feature is becoming more common: wetlands.

Evidence of how Iowa has evolved over Earth’s 4.6-billion-year history is preserved in the rocks. The job of an IGS geologist is to study these rocks using a variety of tools and methods and from the data collected continue to reveal and refine our understanding of that history.