Sunday, September 8, 2013

Gros Morne has spectacular scenary, but it is important for other reasons. One is the Tablelands, where the earth's mantle was pushed up on top of the crust when the tectonic plates collided 400-500 million years ago.


A great deal has eroded since but what remains is informative. As you can see especially in this last picture the land is barren. The rocks of the mantle are more dense than the crust's rock and have minerals in different proportions. This makes the land poisonous to most plants. This area help geologists formulate the tectonic plate theory that we all take for granted today.

Another important site is Green Point, which doesn't look like much, especially on a gray windy day. It is an area of shale and limestone deposits that  were laid down on the bottom of a tropical sea milliions of years ago. In the year 2000, one of these hundreds of layers was designated the global stratotype for the Cambrian / Ordovician boundary in geologic time, as the conodont Iapetognathus Fluctivagos first appeared here approximately 492 million years ago. Yes, I had to copy that in order to get it right.

We were told that the distance between my feet was the deposits from about 60,000 years

But of course the magnificent scenery is the biggest draw



No comments:

Post a Comment