A Close Look at Coal
![Coal](https://geology.com/cover/coal-microscope.jpg)
Coal Through a Microscope Coal is more than a black rock. It is THE most interesting rock.
Turritella Agate
![Turritella Agate](https://geology.com/gemstones/turritella/fossils.jpg)
Turritella Agate is a brown agate containing snail fossils from the Green River Formation.
Animal Fossils
![Animal Fossils](https://geology.com/a/animal-fossils.jpg)
Animal Fossils from the Green River Formation, such as turtles, a bat, and even a horse.
Petrified Wood
![Petrified Wood](https://geology.com/a/petrified-wood.jpg)
Petrified Wood is a fossil that forms when dissolved material precipitates and replaces wood.
Green River Fossils
![Green River Formation](https://geology.com/c2/green-river-fossils-180.jpg)
The Green River Formation is one of the most famous rock units in the world for its fossils.
Insect Fossils
![Insect Fossils](https://geology.com/a/insect-fossils.jpg)
Insect Fossils - beetles and dragonflies preserved in wonderful detail at Fossil Lake.
Fossil Kits
![Fossil Kits](https://geology.com/c/fossil-kit.jpg)
Fossil Kits Learn how to identify fossils and where they fit into the geologic time scale.
What is Peanut Wood?
![Peanut Wood](https://geology.com/c2/peanut-wood.jpg)
Peanut Wood is a type of fossil wood found in Australia. Do you know how it forms?