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karlgreenaway
Any suggestions?

Splitting some slate in Carmarthenshire with my young boy - noticed some blob shapes.

Is it just contamination when the slate formed or possibly plant material. Marks1.jpg  Marks2.jpg  Marks3.jpg 

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prep01
Hello and welcome to the forum. I would need to know the geology of the area, so could you say where in Carmarthenshire you found it, as well as the terraine (foreshore, cliff, quarry, field etc). It doesn't ;ook like slate to me, possibly shale though. Slate is shale that has been subjected to high heat and pressure and is a lot harder than shale. Could we also have some more photos (macro if possible) taken from directly above the wetted block of several of the darker areas.
Thanks
Colin Huller
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karlgreenaway
Colin, many thanks for the response. I am on top of a hill near Cwmpencraig, Carmarthenshire at the SA33 postcode. 280.7mtrs above sea level. Location :51.98371,-4.40000. I have 25acres of a mix of fields and woodland. We are about 30miles from the coast.

The find was on my land (on the hill) The geology (as you can guess I have only a little knowledge) is large amounts of what I call slate and is most probably as you you suggest shale which comes in small pieces and large slabs - using a hammer and chisel its quite easy to split. There is also quite a lot of a white quartz/marble like rock which does appear in very large sized rocks - several tons worth as well as lots of smaller broken bits - we had a large digger doing some work and it couldn't move one of them (Will get a picture of one them - as would love to know what it is).

When you say pictures of the darker areas do you mean the blobs or just darker areas of the rock? I should be able to get Macro pictures.

Many thanks for your response and offering to give your time.
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karlgreenaway
Colin, have taken a few pictures with my microscope - which will hopefully assist. If you need any more detail or minisee010000.jpg 

minisee010002.jpg  minisee010003.jpg  minisee010004.jpg  minisee010005.jpg  minisee010006.jpg  minisee010007.jpg  minisee010008.jpg
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prep01
OK, It looks like the bedrock geology is 444 - 451 million years old (Ordovician) which was deep sea environment. Unfortunately I have no knowledge of this peripd, but close ups pf the 'blobs' etc might help or someone else.
Colin Huller
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