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Early Eocene mollusk shells preserved in the La Meseta Formation, Seymour Island, Antarctica. Photo by Linda Ivany. Most of these are from the bivalve Cucullaea raea. See related article by Ivany et al. (v. 120, no. 5/6, p. 659-678), which discusses how stable isotope values from bivalve shells throughout the formation yield a record of Eocene climate change on this high-latitude, shallow-marine shelf.