Resin becomes amber through a multi-million-year process of , where organic compounds like terpenes break down and cross-link to form a hard, stable material.
: Even historical collections, such as the Goethe amber collection , have recently yielded new insights into evolutionary history through modern imaging of specimens from this era. The Fossilization Process amber-040-054
The identifier typically refers to specimens of Baltic amber estimated to be between 40 and 54 million years old , dating back to the Eocene epoch . This specific age range is highly significant to paleontologists because it captures a period of intense biological diversification following the mass extinction at the end of the Cretaceous period. Why This Specific Age Matters Resin becomes amber through a multi-million-year process of
Amber of this age (often called ) was formed from the resin of now-extinct pine trees. It serves as a "time capsule" for the Eocene, a time when the Earth's climate was much warmer and many modern lineages of plants and insects were first appearing. This specific age range is highly significant to
: Ancient trees secreted this resin to plug holes in their bark and defend against burrowing insects.
: Researchers frequently find rare ants—such as those in the Pseudomyrmicinae subfamily—perfectly suspended within these 40–54 million-year-old pieces.