DEAN GREEN TEAM

Wildlife Conservation Group in the

Forest of Dean

Gloucestershire

 

 

 

 

 

 

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This is the stream with the travatine sand.

When carbon dioxide-rich water percolates through rocks in limestone areas, the water dissolves the limestone and becomes saturated. A drop in pressure and/or change in temperature causes the water to release the carbon dioxide as gas, much like carbonated beverages. The calcium carbonate then recrystallizes and small debris and living biotic material such as moss, algae, and cyanobacteria become encrusted. The biotic material may survive, and may continue growing on top.

17 February 2009

This is an old delapidated lime kiln which has now been exposed by the team.

Note the flying dog!

The team have cleared the hazel from the bank and some of the enterprising souls are taking the long sticks home to use for their runner beans in the summer!

The Bearse

Grid Ref SO573058

Last week we had to cancel our regular Tuesday outing as the snow had made the roads impassable so what a difference a week can make! There was still some snow lying on the higher ground but, down in the valley at the Bearse it was all clear. We were removing the brush from the steep bank to make it better for the butterflies.

The Bearse is a geological site for Travatine Sand and is reputed to be the only site in south west England where the sand can be seen although it is covered in moss in the stream. Travertine is a sedimentary rock. It is a natural chemical precipitate of carbonate minerals; typically aragonite, but often recrystallized to, or primarily, calcite.Travertine forms as calcium carbonate is deposited from the water of mineral springs or rivulets that are saturated with dissolved calcium bicarbonate.

The team at work

Lime Kiln

Travertine Sand

 

 

 

 

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