Friday, March 28, 2008

Weekend fun No. 3

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Weekend fun still is a bit of an irregular feature on my blog however, for this weekend I managed to find something interesting on my bookshelf that should give you something to think about. This deskcrop is about 3 to 4 cm wide to give you an idea of scale. It also features fossil remains to stay within this weekends general theme of Friday Fossil Day.

What are you seeing? What kind of rock is it? What kind of fossil is it? Why is this kind of rock so special (aside of the fossil)?



The fossil is rather difficult to recognise but this is the best I could do. To give you a hint. This is not a complete fossil. A big part is missing but what is there is enough to recognise it for what it is. Also the rock is slightly more grey than can be seen on a foto. Thus are the limitations of digital cameras I guess.

7 comments :

Silver Fox said...

It looks a bit like coal, and honestly, I'm not that good with fossils!

The Lost Geologist said...

I am not giving away too much when I say that dispite looking like coal it is not.

BrianR said...

gilsonite?

Mel said...

Just organic rich shale then? I've seen similar rocks surrounding coal deposits in PA.

Silver Fox said...

No one seems to be coming anywhere close to any fossils! Maybe it's a part of a bone.

The Lost Geologist said...

Mel is basicly right when thinking about an organic rich shale. This one is from Eastern Germany. The partial fossil should be a clue to what kind of shale because these are well known for them and...

Silver Fox is (almost) right when thinking of "bones".

Mel definitly is right about an organic shale however, there is more to this sample than that.

I'm not sure if I should give more clues or resolve completely.

The Lost Geologist said...

I'll resolve: It is a piece of shale from the "Kupferschiefer" that stretches from Germany into Poland and has/is being mined for mainly Cu. The partial fossil is the head of a fish showing eye, mouth and some other fishbones. I think it can also be classified as a black shale in some areas. Will try to make a more detailed post on the weekend maybe.