Willemite (a zinc ore) under a black light.

Trilobite. Cambrian, from Morocco.

Trilobite with imprint. Cambrian. From Morocco.

Dogtooth calcite crystals in a fossilized bivalve shell fluoresce under a black light. Phosphorescence persists after illumination ends. From Terlingua, Texas.

Ammonite (Dactylio cera) from New Mexico.

Various trilobites from Morocco, Cambrian.

Unknown vertebra (left) and tooth from a Western horse (Equus occidentalis, extinct). Preserved in tar sands in Southern California.

Fossil teeth from a Mackerel shark (top right: Otodus verticalis). From the Sahara Desert.

Partly fossilized worm snail shell. From near Spanish Point, Sarasota, Florida.

Fossilized Bull shark teeth. From Venice, FL.

Fossilized eagle ray tooth (Myliobatis reduxi).

Fossilized bird bone (note hollowness).

Archaeocete whale vertebrae. From Oklahoma.

Tree bark (Calamites cisti).

Fossilized algae.

Portion of a dinosaur egg shell

Ammonite in sandstone. Lake Texoma, Oklahoma. Lower Cretaceous.