Pontsarn, Merthyr Tydfil: Geology
Description
Taf Fechan Gorge, potholes CaCo3 solution. Collapsed cavern
Dripstone of chemically formed tufa deposited in bed of Glais stream which joins Taf Fechan at Pont Sarn. Petrification as for stalactites etc. Ca(HCo3)2 becomes CaCo3 + Co2 + H2O
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