Eocene. In 1833, Charles Lyell derived the name Eocene from the Greek words Eos (meaning “dawn”) and Kainos (meaning “recent”). At the time, the Paleocene had not yet been named, so the Eocene became the “dawn of the recent” (Cenozoic Era). Lyell chose this term because only about 3.5% of fossil mollusks from sediments of this age were recent species.
UT Department of Environmental Sciences
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
"Phylum Mollusca, Class Gastropoda" (2017). Rock and Mineral Exhibit. 107.