Hiking backwards in time. Southern Ontario's sedimentary deposits hold the fascinating story of our planet's last half billion years. Most of the surface rock in Southern Ontario is limestone, dolostone or marble. Consequently, geologic history is readily visible in its distinctive layers -- if you know where to look. Explore ancient seabeds. See evidence of violent, catastrophic floods. Witness the effects of glaciers that scoured the continent. Discover signs of droughts that lasted thousands of years. No matter what your age or skill level, Rockwatching is an entertaining and informative guide that shows you can go back in time. Rockwatching features fascinating locations that can be explored in a single afternoon. Visit the formidable cliffs above Georgian Bay, their enormous broken potholes gaping like fierce jaws. Or, on the opposite side of the Bruce Peninsula, stroll through the dunes of Dorcas Bay, where strange, red-veined pitcher plants lurk among the bog reeds and many species of orchid make their home. Other trips include: Rockwood Mt. Nemo Belfountain Ball's Falls Queenston Heights Moira Lion's Head Bobcaygeon Marmora Little Bluff Inglis Falls Devil's Glen Limehouse Maitland Trail. Rockwatching provides maps and directions to each feature as well as safety tips and valuable hiking advice.