A rich collection of fossil beds found in central Colorado which likely formed as the result of volcanic ash causing an algal bloom, which then sank to the bottom of the lake, preserving recently fallen organisms.
The second epoch of the Tertiary Period. The Eocene began nearly 56 million years ago and lasted about 20 million years.
A climate zone located between each tropic circle (Tropic of Cancer/Capricorn) and the nearest 38th parallel. Subtropical climates are often characterized by hot, humid summers and mild winters.
A species or organism which benefits from taking advantage of another species or organism—the host—at the expense of the host.
An object or organism that transmits pathogens from one host to another, causing disease.
A unicellular parasite that is transmitted via the saliva of tsetse flies and causes sleeping sickness in humans.