Dear Syed,
The locality of the specimen is Morocco and the age might be devonian.
Best,
Hakima
Dear Hakima
The figures is not clear, please provide high resolution figures of it. Regars to Devonian position, it seems to coral remains
Regards
Massih
Hakima:
I suspect this to be a piece of Crinoidal Limestone, though picture quality is not of desired expectation - Do check CaCO3 and other skeletal elements like Coral remains.
Best
Syed
Syed,
Tomorrow i will check CaCO3 with HCL and tell you the reaction.
Best,
Hakima
Hello,
a decission, if the fossils are corals or crinoids is only possible with better Fotos.
With Kind regards
Angelika
Hi Hakima,
It seems to be crinoidea fosils. Did not you find other fosils close to these?
Best regards
DG
HI everybody,
I agree that a better photo might help. Anyway, working with the present images, the fossils look much more like partially disarticulated crinoid stems than any coral remain. Hakima, "Morocco" is quite a wide location to get any approach to the question, but nice examples of crinoidal limestones occur in Morocco from the basal Devonian on.
Best,
Juan
To me this appears to represent crinoid fragments, but to be sure you might prepare a thin section of the rock.
I concur with the other entries, Hakima -- your rock from Moroc (!) is very likely a crinoidal limestone or dolostone; more can be read and the original fossil organism can be seen at: http://palaeo.gly.bris.ac.uk/palaeofiles/fossilgroups/crinoidea/page4.html
http://palaeo.gly.bris.ac.uk/palaeofiles/fossilgroups/crinoidea/page4.html
Dear Christopher,
Thank you so much for your answer and for the interesting ink.
Of course the rock is from the south of Morocco.
I will nominate this fossil like crinoidal limestone or dolostone.
Cordially
Hakima.
Dear Hakima,
We can see crinoid columnal associations. As noted by colleagues, we can speak of Crinoidal Limestone that may be distinguished from other limestones due to the presence of large quantities of fossils (Corals, Brachiopods, Foraminiferan tests and Mollusks). So, making a thin section can provide more details.
Best regards,
Amor DEGAICHIA
Hakima, What was the result of putting some drops of HCl (hydrochloric acid - 10% strength solution) on the rock? Did it fizz vigorously, or not at all? If not, then maybe scratch the surface on a small flat area (using a knife) until you have a small amount of powder made from the scratching. Place the HCl solution on the powder, to observe if it fizzes slowly (indication of dolomite).
Dear Amor and Michael,
As you said, a thin section of this rock will be very useful to be sure for the nomination. If i prepare it, i will tell you about the result and posting their pictures.
Best,
Hakima
Dear Chun,
Thank you so much for all suggestion to having a high-resolution photography.
Best,
Hakima
Dear all,
The reaction with HCL is positive on the shell remains.
Best,
Hakima
I agree its a crinoidal limestone, as Syed Abbas Jafar and others said, beyond doubt.
Dear Javier,
Thank you so much for your answer. And for confirmation that it was a crinoidal limestone.
Best,
Hakima
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