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Tuesday, 20 May 2014

Fresh spotted dolerite


Thanks to Chris for sending this photo.  He says this lump of spotted dolerite is near Carn Menyn (Carn Meini) and about 150m downslope from where the river springs.  Presumably that means somewhere near the "stone river" that some people get so excited about.........

It would also be not too far from the strange little burial mound that Profs TD and GW excavated a while ago, with our old friend Alice paddling about in the pouring rain.  Remember that?  It was all on the telly.......

The apparent freshness of the flanks of this stone is certainly intriguing.  Some of the heavily weathered surfaces on and near Carn Meini have of course been exposed to cosmic radiation and chemical weathering for hundreds of thousands of years,  and some which have been exposed just since the Devensian will certainly look much fresher.   This stone is worth investigating.

In this area we must be careful, because we know that local farmers (and the faithful congregation of the Mynachlogddu Chapel) have been collecting building stone from here over the past 200 years, so the stone may have been bashed about at some stage in the 1800s or even 1900s.

1 comment:

chris johnson said...

This is to the SE, where the river is forming that flows down to join the Eastern Cleddau.