PaleoOrdo Posted June 6, 2021 Share Posted June 6, 2021 (edited) I found this strange stone in Hadeland in Norway. On it I found patterns of 2 nautiloids and some STRANGE structures. Could it be a sponge? The age is middle Katian, Upper Ordovician. Enlarged nautiloid part, not an ortoconic? The "arm"-structures are on all sides of the stones. Finally, the last side with a rather unusual form of a nautiloid, not so well preserved. Can it be called orthoconic when it expands its diameter so rapidly? Edited June 6, 2021 by PaleoOrdo Link to comment Share on other sites More sharing options...
Tetradium Posted June 6, 2021 Share Posted June 6, 2021 No sponges. I see a horn coral in #7. 1 Link to comment Share on other sites More sharing options...
fifbrindacier Posted June 6, 2021 Share Posted June 6, 2021 On 6/6/2021 at 11:59 AM, PaleoOrdo said: There are "shelly" things here, i think the little branched one is a bryozoan. Quote I see what could be a coral here. 1 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
PaleoOrdo Posted June 7, 2021 Author Share Posted June 7, 2021 10 hours ago, Tetradium said: No sponges. I see a horn coral in #7. I see the horn coral, but I mean the long "arm" or branching white structures. If not sponge, are they just crystal intrusions? It is hard to believe that for example the spiral form in this picture is made by an intrusion. Maybe it is a bryozoan? Link to comment Share on other sites More sharing options...
PaleoOrdo Posted June 7, 2021 Author Share Posted June 7, 2021 (edited) I think the fossil look very similar to the bryozoan circles posted by Dimitar in this forum last week: Ordovician, circular - Fossil ID - The Fossil Forum Edited June 7, 2021 by PaleoOrdo Link to comment Share on other sites More sharing options...
Rockwood Posted June 7, 2021 Share Posted June 7, 2021 The inverted V shape in the sixth photo is typical of a sectioning of crinoid stem with a large lumen. The texture of the irregular forms in questions is similar enough to make me wonder if they could be crinoid holdfast structures. Link to comment Share on other sites More sharing options...
minnbuckeye Posted June 7, 2021 Share Posted June 7, 2021 21 hours ago, PaleoOrdo said: This image shows the white structures are tubular, especially seen on the lower end of this example. Whereas the lower picture shows the items in question split in half. Could they be burrows??? Just a guess. 21 hours ago, PaleoOrdo said: Link to comment Share on other sites More sharing options...
PaleoOrdo Posted June 7, 2021 Author Share Posted June 7, 2021 (edited) 34 minutes ago, minnbuckeye said: This image shows the white structures are tubular, especially seen on the lower end of this example. Whereas the lower picture shows the items in question split in half. Could they be burrows? It is a nice observation that the structures are tubular, but if they were burrows (for example from a worm) should we not expect less varation in the thickness of the tubes and even more irregular patterns of the lines? Edited June 7, 2021 by PaleoOrdo Link to comment Share on other sites More sharing options...
Rockwood Posted June 7, 2021 Share Posted June 7, 2021 Could we be missing the tree for the forest here ? I can see it being a big gastropod that is sectioned in this way. Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 7, 2021 Share Posted June 7, 2021 Cross sections are very difficult to identify . I think it will be impossible, without breaking the rock up to see what gets exposed. 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Rockwood Posted June 7, 2021 Share Posted June 7, 2021 Link to comment Share on other sites More sharing options...
PaleoOrdo Posted June 7, 2021 Author Share Posted June 7, 2021 5 hours ago, Rockwood said: Could we be missing the tree for the forest here ? I can see it being a big gastropod that is sectioned in this way. I like the way you think. I am considering both the tree and the forest as options. Maybe I should open the stone, but I am in doubt as I not have the skills to do that in a proper way. Link to comment Share on other sites More sharing options...
Rockwood Posted June 7, 2021 Share Posted June 7, 2021 1 hour ago, PaleoOrdo said: proper way. Hee hee hee Got a hammer ? Just what I might consider. 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 8, 2021 Share Posted June 8, 2021 I don't believe there is anything so special here that would warrant NOT breaking the rock. Just my 2 cents. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
PaleoOrdo Posted June 8, 2021 Author Share Posted June 8, 2021 (edited) I agree Tim og Rockwood. I will break it open starting from one or two of the corner of the rock, or maybe through the divisions already in the rock, calling upon the strength of the old norse God, "Thor with the hammer". By the way, it will rain and be lightening and thunder here in Norway today. Edited June 8, 2021 by PaleoOrdo Link to comment Share on other sites More sharing options...
PaleoOrdo Posted June 11, 2021 Author Share Posted June 11, 2021 I managed to open the rock with my hammer, it was little to see inside it, except two big bivalve with nice colors (!) and one rugose coral line form, the white lines was not any clearer inside just recrystalisations preserved, still think those are bryozoa or coral. Link to comment Share on other sites More sharing options...
fifbrindacier Posted June 17, 2021 Share Posted June 17, 2021 On 6/6/2021 at 11:59 AM, PaleoOrdo said: There are "shelly" things here, i think the little branched one is a bryozoan. Quote I see what could be a coral here. 1 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
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