Kathy and Larry Turns pause in the foyer to the restaurant of the Olde Marco Inn to look at decades-old tarpon scales displayed under glass. The fish scales, each roughly the size of a silver dollar, document the size of each fish caught, the year, the name of the angler and the guide that led the successful expedition. The Turns were on their way out of a lecture Wednesday afternoon, February 6, by William Marquardt, director of the University of Florida Institute of Archaeology and Paleoenvironmental Studies and an expert on the anthropology of the Calusa Indians. The lecture and adjoining field trip were sponsored by the Marco Island Historical Society. Look for a question and answer feature with Marquardt on Marco's history in the Feb. 17 edition of etc, the Eagle's Sunday publication.