Southern Rock Point

 

 

Rock point is located at the southern end of the pond, to the east of the marsh. It sticks out approximately 100 feet from the edge of the pond, so be careful of your canoe's bottom. It is a great place to stretch your legs but BEWARE! Leeches are in abundance at this end of the pond, as a result of the shallow water and proximity to the marsh.

The point is made of a rock called Phyllite, specifically from theCheshire Formation.. These rocks were previously siltstone, but they were metamorphosed by the heat and pressure during the formation of mountains and the moving of continents. It is medium to dark gray in color and has a very obvious fiber to it. If you break off a piece of the rock you can see it sparkle slightly. If the rock had been exposed to more heat and pressure, distinctive layers of mica (sparkly crystals) would have

You may be asking yourself how this type of rock got to this area. If it used to be a siltstone (made of silt), it had to have been at the bottom of a lake or sea. As a matter of fact, 550 million years ago the Colchester Pond area was like South Carolina is now. It was submerged by the Champlain Sea and gradually built up fine grained sediments like silt and clay towards the bottom middle of the sea due to tributary rivers and streams. Over time the sea receded and the silt went through two specific orogenies (mountain building events). One happened 475 million years ago and was called the Taconic orogeny. It made the, yeah, you guessed it, Taconic mountain range. The second was 350 million years ago and was called the Acadian orogeny. It built the Acadian Mountain range. With all this tremendous pressure and heat from the east and west, it squeezed the sediments at the bottom of the sea into sedimentary rock then later metamorphosed it into Pyllite. With the pressure coming from the east and west this caused the layers of the rock to be slanted upward instead of parallel to the land. We can tell this because the pressure is always perpendicular to the layers of the rock.

Phyllite is the type of rock you will almost always find in your travels because it covers 3/4 of the pond's edge. So have fun visiting the Point, but again BE CAREFUL! Please keep your feet leech free.