How to Add Pictures and Text

(See Detailed Instructions) For your own Author account so you can add text and images, contact Dale Hubert

from Pete Seeger:

“Kids- if YOU keep your sense of humor, and reach out to other kids in ALL the world, and get them to reach out to you in their own way, there may be a human race here in another 100 years!”
- Pete Seeger, written to Dale Hubert on the back of his Flat Stanley

Flat Stanley Explores Cornish Geology

Cornwallgeologymap2

Two very significant areas for both the amateur and keen geologist must surely be the tilted rock strata of the north Cornish cliffs between Millook Haven and Woolacombe in Devon.  The other has to be the metamorphic thrust zone of the Lizard Peninsula.  An area of varied geology and landscape has essentially been formed by the collision of two tectonic plates.

CornwallBasaltGraniteMap

The coastal section through north Cornwall into Devon that runs to Bude and Hartland Point contains a spectacularly folded series of inter-bedded sandstones and shales originally deposited deeply under water.

Millook Haven

The cliffs at Millook Haven are a great site for getting to grips with these deformed rocks.

The folds are recumbent and have a characteristic “chevron” kinky shape that tends to form when strongly layered rocks are buckled.

Millook 12Sept2015 (22) copyMillook 12Sept2015 (23)

Coverack

Coverack 14May2011

The Moho is the boundary between the earths crust and the mantle; it usually lies at a depth of between 5 – 8Km beneath the oceans and 25 – 60Km beneath the continents. The Coverack area provides a rare opportunity to examine a geological section showing a transition from the mantle to the crust which, 380 million years ago was 5Km (3 miles) below the surface.

Coverack 14May2011 (6)Coverack 14May2011 (5)_edited-1 flat stanley

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

At Coverack (pronounced Cover-ack) you will be able to see this boundary layer, which, was once about 5Km beneath the ocean floor, and is now exposed at the surface and laid flat.  Progressing from South to North along the Moho you will be effectively travelling up through the earth’s interior.

Coverack 14May2011 (1) Coverack 14May2011 (2) Coverack 14May2011 (3)
Coverack 14May2011 (4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Coverack 14May2011 (8)

Starting at the South end of the beach, near the harbour, you will find serpentine rock from the upper mantle; continuing along the Moho, you will enter into the transition zone, characterised by the intermingling of serpentine and gabbro and the intrusion of basalt. In addition, there is a rare, highly coloured red and white rock known as troctolite present here. Proceeding further north you finally enter the area of gabbro marking the start of the oceanic crust.

It is not necessary to be on the beach to view the Moho you can stay on the footpath above the sea wall.

COVERACK BEACH IS A SITE OF SPECIAL SCIENTIFIC INTEREST PLEASE DO NOT REMOVE ANY ROCKS FROM THE AREA.

Geology2

 

Leave a Reply