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Author Topic: Few questions about rocks  (Read 1492 times)

Offline adam15

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Few questions about rocks
« on: 10/01/2015 15:54:25 »
Hi all. I was collecting fossils in the Menlough quarry few kilometres north from Galway in west Ireland. Fosils are from early carboniferous. I found there is few kinds of rocks. My first question is about their id.

First type of rock is fine grained and soft. Big stone after few hits with hammer cracks to uneven slabs. Shells of brachiopods which are main fossil in this rock are very nice preserved and easy to prep.
newbielink:http://www.fotosik.pl/pokaz_obrazek/ce1dc4a7701d0d1f.html [nonactive]

Second type of rock which is the most common in the quarry is very hard grey-black. It's very hard to hammer. Most of fossils in this rock are colonial corals and large productids.
newbielink:http://www.fotosik.pl/pokaz_obrazek/b74ba680f2f8afa3.html [nonactive]

Third type is easy to hammer but not so easy like the first one. Grains are coarse. Main fossils smaller species of brachiopods.
newbielink:http://www.fotosik.pl/pokaz_obrazek/829ea422c6cd0f6f.html [nonactive]

Second question is, where in this formation is a place of those rocks. which of them are the oldest and youngest.
newbielink:http://www.fotosik.pl/pokaz_obrazek/7ee3dae73e1e99ba.html [nonactive]

There is more kinds of rocks in the quarry without fossils ,probably volcanic.
I will appreciate any help. Adam


 

Offline adam15

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Re: Few questions about rocks
« Reply #1 on: 14/01/2015 08:50:59 »
Hi.I found that rock from the first pic could be mudstone shale.
 

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Re: Few questions about rocks
« Reply #1 on: 14/01/2015 08:50:59 »

 

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