During the Triassic Period, the continental drift created a valley where the Bay of Fundy now exists. Over time sediment and deposits washed down from the hills and hardened into red sandstone. At the end of the Triassic and the start of the Jurassic Period, volcanic eruptions flooded the valley with lava, hardening into Basalt. In this picture of Economy Mountain in Five Islands Provincial Park, you can clearly see where erosion has exposed the basalt at the top and the sandstone on the bottom, separated by what I'm told is agate, but might be gypsum.

During the Triassic Period, the continental drift created a valley where the Bay of Fundy now exists. Over time sediment and deposits washed down from the hills and hardened into red sandstone. At the end of the Triassic and the start of the Jurassic Period, volcanic eruptions flooded the valley with lava, hardening into Basalt. In this picture of Economy Mountain in Five Islands Provincial Park, you can clearly see where erosion has exposed the basalt at the top and the sandstone on the bottom, separated by what I'm told is agate, but might be gypsum.