sentences:  In 1998, a team led by climatologist David W. Stahle (of the University of Arkansas) and archaeologist Dennis B. Blanton (of the College of William and Mary) concluded that an extreme drought occurred in Tidewater between 1587 and 1589.Their study measured growth rings from a network of bald cypress trees, producing data over ranging from 1185 to 1984.Specifically, 1587 was measured as the worst growing season in the entire 800-year period.