Pottery Posted May 30, 2017 Share Posted May 30, 2017 Hello guys and girls, I'm new here :-) Could you help me identify these fossils. They are all from my local city of Porsgrunn, Norway. I gathered these over the cause of a few days due to construction work, so I saved them before the whole area is buried under tons of rubble. The first fossil (1-2) around the size of a finger, the "branch" was much longer before I broke it lose, around half a meter. Image 3-5 is the one I am most curious about, could it be a trace fossil of some sort. It's embedded in the shale, some of the lines are 0,5 cm deep. From what I know Image 6 is most likely a Ragusa coral, and Image 7 is probably Stromatolites. The last fossil looks like it fell out of a geode at some point. :-) Most of the local fossils here in Porsgrunn can usually be dated to the Ordovician or early Silurian and they are relatively small in size. Porsgrunn in Telemark is a part of the Oslo Geological Field in Norway, which is a part of the Burgess Shale. The fossils in the Oslo Geological Field can be dated to around the Precambrian era to late Silurian. Thanks :-) Link to comment Share on other sites More sharing options...
Wrangellian Posted May 30, 2017 Share Posted May 30, 2017 Welcome to the Forum. Interesting stuff.. I don't think all of them are fossils, but #1 might be crinoid stem, I'm not sure. #3-5 I suspect is geologic - I have picked up similar rocks from creeks/rivers, and my guess is it's a piece of metamorphosed slate or similar that has been differentially eroded. #6 is interesting. Looks like stromatolites, but maybe just concretions? I would keep it, either way. #7 maybe fossil? #8 as far as I can tell is geologic. Other members might be able to provide more insight, let's wait and see. Link to comment Share on other sites More sharing options...
Miocene_Mason Posted May 30, 2017 Share Posted May 30, 2017 Agree with @Wrangellian fully, the last one looks like limestone that's been dissolved by water, this may be the case with the one with lines as well. “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
doushantuo Posted May 30, 2017 Share Posted May 30, 2017 i think i see "Collenia " in there Oslo "part of the Burgess shale"? Link to comment Share on other sites More sharing options...
doushantuo Posted May 30, 2017 Share Posted May 30, 2017 ah,the Fennoscandian region ,ya gotta love it Link to comment Share on other sites More sharing options...
Pottery Posted May 30, 2017 Author Share Posted May 30, 2017 Thanks you guys :-) I suspected the second one was a concretion. Here is a picture nr. 6 I think there is algae growth, and the underside of nr. 7 I thought I read somewhere that Oslo was a part of the Burgess shale :-p Link to comment Share on other sites More sharing options...
Wrangellian Posted May 30, 2017 Share Posted May 30, 2017 10 hours ago, doushantuo said: ah,the Fennoscandian region ,ya gotta love it Looks like an excellent paper. I guess the reference to Burgess Shale was because of the association with the similarly-aged Alum/Orsten Lagerstatten? 9 hours ago, Pottery said: Thanks you guys :-) I suspected the second one was a concretion. Here is a picture nr. 6 I think there is algae growth, and the underside of nr. 7 I thought I read somewhere that Oslo was a part of the Burgess shale :-p The last one looks like a horn coral, but it's still hard to tell. It might help if I knew more about the geology of the area it came from but I don't know where to find that information. Your stones look like they could come from a range of formations/ages. Link to comment Share on other sites More sharing options...
Pottery Posted May 30, 2017 Author Share Posted May 30, 2017 13 minutes ago, Wrangellian said: Looks like an excellent paper. I guess the reference to Burgess Shale was because of the association with the similarly-aged Alum/Orsten Lagerstatten? Yes I think that's the case :-) I'm new to all this and I browsed through a few books at the library, I got the reference wrong, it's very exciting though, I've always known about the shale fossils but the mudstone/chalk and mineral ones were new to me :-) Link to comment Share on other sites More sharing options...
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