Guguita2104 Posted July 10, 2015 Share Posted July 10, 2015 Is this ammonite a perisphinctes? Link to comment Share on other sites More sharing options...
Fossildude19 Posted July 10, 2015 Share Posted July 10, 2015 You may need better pictures to get a positive ID. Also, telling us where it came from would be helpful as well. I did the best I could to enhance the picture, but it is still quite fuzzy. Regards, 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...
michele 1937 Posted July 10, 2015 Share Posted July 10, 2015 Is this ammonite a perisphinctes? IMG_05591.JPG OK Link to comment Share on other sites More sharing options...
Guguita2104 Posted July 11, 2015 Author Share Posted July 11, 2015 Sorry for the bad pic... I found this fossil in Sepins, Coimbra ,Portugal.In that region we find lots of Mesozoic Era species, like ammonites, belemnites,Lobothyris and Rynchonellas. So, here are new photos (I did my best ) Link to comment Share on other sites More sharing options...
Fossildude19 Posted July 11, 2015 Share Posted July 11, 2015 Thank you for the additional information. There is no scale in the picture, so could you either take a picture with a ruler for scale in it, or could you tell us the measurements? Someone who is knowledgeable about ammonites should be along soon. Regards, 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...
abyssunder Posted July 11, 2015 Share Posted July 11, 2015 (edited) Just a step closer: Guguita,do you mean Serpins,Coimbra,Portugal(Lat.40.150,Long.-8.200,Alt.700km)?Coimbra is situated in the Lusitanian Basin,so the outcrops are from Jurassic(Sinemurian).Maybe this document helps. http://www.palaeodiversity.org/pdf/03/Palaeodiversity_Bd3_Dommergues.pdfPerisphinctes is an index fossil for Callovian-Tithonian,not Sinemurian in the geologic timescale,but is possible that Serpins(or your site) is in other Formation,so I speculate, your specimen could be Perisphinctes. Edited July 11, 2015 by abyssunder " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Ludwigia Posted July 11, 2015 Share Posted July 11, 2015 I'm not so sure that it's a Perisphinctes and can't really say definitely unless better photos are posted showing good details of the ribs. It could very well belong to the Family of the Perisphinctidae, but it's not necessarily a Perisphinctes sp. It would certainly help to know which layer it was found in. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Guguita2104 Posted July 15, 2015 Author Share Posted July 15, 2015 (edited) Thanks for the info and sorry for the delay... There are new photos with best details (It's the best I can do)...I found this fossil in sepins, Coimbra, Portugal.It has 21 cm of diameter.My ammonite seems evolute and the ribs bifurcate after ventral bord. . Edited July 15, 2015 by Guguita2104 Link to comment Share on other sites More sharing options...
Ludwigia Posted July 15, 2015 Share Posted July 15, 2015 The photo doesn't reveal any more than the previous ones and we still don't know exactly what age it is. If it's from the Sinemurian, then it can by no means be Perisphinctes, since they hadn't as yet come into existence. I can't go any farther than to say, as I have already suggested, that it just could be an ammonite belonging to the Perisphinctidae, which would mean that it was found in a younger layer. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Eocenecarnage Posted July 28, 2015 Share Posted July 28, 2015 Some like Dactylioceras, but way to large. Link to comment Share on other sites More sharing options...
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