1. of, relating to, or denoting the second epoch of the Tertiary period, lasting from about 56 to 34 million years ago
Usage: geology; paleontology

1. the Eocene epoch or the rocks and deposits formed during this time
Usage: geology; paleontology

Examples

• Eocene fossils reveal the presence of early primates in North America.
• The Eocene epoch was characterized by a warm, humid climate.
• Paleontologists discovered Eocene deposits rich in mammalian remains.
• During the Eocene, the continents were in different positions than today.
• The Eocene rocks in this region contain valuable information about ancient ecosystems.