Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
Silurian Period sediments laid down 430 million years ago were metamorphosed underground into a gneiss 360-415 million years ago, and intruded by molten rock which cooled slowly, creating the park's exposed metamorphic gray rocks with dikes of harder, white igneous rock. Underground heat and pressure tortured and folded the rock layers into the striking patterns that are now pounded and polished by the sea and rough weather.
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.
Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.