Ferguson Hill contains the most complete macrofossil record spanning the Triassic-Jurassic boundary in North America. The ammonoids from the uppermost Triassic can be traced to the boundary and the earliest ammonites (Psiloceratids) can be seen right at the base of the Jurassic.

The Giant's Causeway is a spectacular expanse of interlocking hexagonal basalt columns formed from volcanic eruptions during the Paleocene some 50-60 million years ago.

These columns tell a story of the cooling and freezing of the lava flows that formed them. As lava at the surface cools and freezes, it also shrinks as its molecules rearrange themselves into a solid structure. This happens much more quickly at the surface where the lava comes in contact with moist, cool air. As the basalt cools and shrinks, pressure increases in intensity and cracks begin to form. A way to dissipate this huge stress is to crack at an angle of 120 degrees, the angle that gives us a hexagon.