Crazyhen Posted March 2, 2019 Share Posted March 2, 2019 This is said to be a piece of coral from Guizhou of China. What do you think? Link to comment Share on other sites More sharing options...
Rockwood Posted March 2, 2019 Share Posted March 2, 2019 I think stromatolite seems more likely. 1 Link to comment Share on other sites More sharing options...
Scylla Posted March 2, 2019 Share Posted March 2, 2019 Not a coral, no coralites or septae visible Link to comment Share on other sites More sharing options...
TqB Posted March 2, 2019 Share Posted March 2, 2019 I think it is a coral - a rather strangely preserved tabulate, a favositid kind of thing. It has very clear tabulae across the full diameter of each corallite (and no septa, as Scylla says). (By the way, plurals of the structural terms are confusing as the singulars have different endings (different genders) - so it's tabula/tabulae but septum/septa!) 3 Tarquin Link to comment Share on other sites More sharing options...
Rockwood Posted March 2, 2019 Share Posted March 2, 2019 22 minutes ago, TqB said: It has very clear tabulae across the full diameter of each corallite It's has clear demarcation of diameter and color variations, but I flatly disagree that they are clearly tabulae. Link to comment Share on other sites More sharing options...
Rockwood Posted March 2, 2019 Share Posted March 2, 2019 @Crazyhen Do you know the age ? Link to comment Share on other sites More sharing options...
TqB Posted March 2, 2019 Share Posted March 2, 2019 26 minutes ago, Rockwood said: It's has clear demarcation of diameter and color variations, but I flatly disagree that they are clearly tabulae. I believe this is a single vertical corallite in the middle, with weathered in tabulae going across it. Tarquin Link to comment Share on other sites More sharing options...
Al Dente Posted March 2, 2019 Share Posted March 2, 2019 I’ve seen Favosites that have weathered this way. It appears that most of the coral has weathered but the matrix filling the corallites is more resistant. 2 Link to comment Share on other sites More sharing options...
TqB Posted March 2, 2019 Share Posted March 2, 2019 Just now, Al Dente said: I’ve seen Favosites that have weathered this way. It appears that most of the coral has weathered but the matrix filling the corallites is more resistant. I agree. The structure is like this little polished Michelinia (closest pic I could quickly find in my collection). 1 Tarquin Link to comment Share on other sites More sharing options...
Rockwood Posted March 2, 2019 Share Posted March 2, 2019 31 minutes ago, Al Dente said: I’ve seen Favosites that have weathered this way. It appears that most of the coral has weathered but the matrix filling the corallites is more resistant. I have something like it from turbidite. The stacks look like they had been through an earthquake. Probably for good reason. Definitely could work as an explanation. Link to comment Share on other sites More sharing options...
westcoast Posted March 2, 2019 Share Posted March 2, 2019 I would agree with coral on this Link to comment Share on other sites More sharing options...
Crazyhen Posted March 2, 2019 Author Share Posted March 2, 2019 8 hours ago, Rockwood said: @Crazyhen Do you know the age ? It is said to be Devonian. 1 Link to comment Share on other sites More sharing options...
Rockwood Posted March 2, 2019 Share Posted March 2, 2019 1 hour ago, Crazyhen said: It is said to be Devonian. A quick google had me thinking Cambrian. Link to comment Share on other sites More sharing options...
Scylla Posted March 3, 2019 Share Posted March 3, 2019 So an internal mold of a favosites if you will? With dissolution of the favosites to leave the crevices we see? Link to comment Share on other sites More sharing options...
Rockwood Posted March 3, 2019 Share Posted March 3, 2019 54 minutes ago, Scylla said: So an internal mold of a favosites if you will? With dissolution of the favosites to leave the crevices we see? Excellent question. Perhaps another angle would be to ask when did and to what degree did the actual body fossil dissolve away ? My thought is that perhaps the disappearance was nearly complete relatively early in diagenesis. 1 Link to comment Share on other sites More sharing options...
TqB Posted March 3, 2019 Share Posted March 3, 2019 1 hour ago, Scylla said: So an internal mold of a favosites if you will? With dissolution of the favosites to leave the crevices we see? That's pretty much it. I've seen similar weathering of other types of coral when it was certainly a recent phenomenon following exposure (UK Carboniferous stuff). I suspect this one would look "normal" if it was sliced. 2 Tarquin Link to comment Share on other sites More sharing options...
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