In the early 1990's, shark teeth, dinosaur teeth, and other fossils of the Cretaceous Age were uncovered here. These finds are evidence that this area was covered by the sea 75 million years ago when dinosaurs roamed the earth and giant sharks and other reptiles swam in the ocean. The many boulders that litter the creek bed (known as concretions) show evidence of shell imprints and other fossils, and shark teeth and other fossils can be found by sifting through the sand and rocks in the creek. Depending on when you visit the park, you may see people in the shin-to-waist-deep water, sifting and digging around the large concretions. There is no harm in bringing some clothes you don't mind getting wet and joining in!
If you haven't done so already, be sure to check out the Earthcache (GC10JN2) in the Fossil Park!