John Bucher Posted July 6, 2015 Share Posted July 6, 2015 On a recent trip to the East coast of Gotland, Sweden (an island in the Baltic Sea) I found an alluring piece of limestone with a fossil protuding from one side. The island of Gotland is made of limestone from "a Silurian reef". I have attached a photo of the section of the fossil that caught my eye...! A geologist at work suggested that it may be an Orthoceras, but I now think it may be a Trilobite, what do you think? Thanks for any opinions! Link to comment Share on other sites More sharing options...
Ludwigia Posted July 6, 2015 Share Posted July 6, 2015 Looks to me more like Orthoceras than a trilobite. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Fossildude19 Posted July 6, 2015 Share Posted July 6, 2015 I agree with Roger - orthocone cephalopod. 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...
Auspex Posted July 6, 2015 Share Posted July 6, 2015 I think you could 'open it up' and remove all doubt. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
John Bucher Posted July 7, 2015 Author Share Posted July 7, 2015 I'm very tempted to split it open, though it has an alluring nature as-is! I'll keep you posted! Link to comment Share on other sites More sharing options...
ZiggieCie Posted July 7, 2015 Share Posted July 7, 2015 Link to comment Share on other sites More sharing options...
abyssunder Posted July 7, 2015 Share Posted July 7, 2015 As i can see in the picture (but I'm not convinced), in the left side of the top could be a trilobite (or two). " 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...
FossilDAWG Posted July 7, 2015 Share Posted July 7, 2015 This is definitely an orthoconic nautiloid. The proportionally large size of the siphuncle and the small size of the cameral chambers suggests an actinocerid or armenocerid, possibly something along the lines of Huronia. I admit I'm not very familiar with the Gotland genera of cephalopods, I know the brachiopods and corals better. I see nothing that suggests a trilobite in the photo. Don Link to comment Share on other sites More sharing options...
Herb Posted July 7, 2015 Share Posted July 7, 2015 looks like the pleural sections of a trilobite from the side to me. "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
piranha Posted July 8, 2015 Share Posted July 8, 2015 I agree 100% it's an orthoconic cephalopod. Here's a list of the Silurian cephalopods from Gotland: Ascoceras bohemicum Ascoceras cochleatum Ascoceras cucumis Ascoceras decipiens Ascoceras fistula Ascoceras gradatum Ascoceras lagena Ascoceras manubrium Ascoceras pupa Ascoceras reticulatum Ascoceras sipho Choanoceras mutabile Dawsonoceras annulatum Glossoceras gracile Gomphopceras sp. Ophidioceras reticulatum Ophidioceras rota Orthoceras sp. Phragmoceras inflexum Phragmoceras praecurvum Manten, A.A. (1971) Silurian reefs of Gotland: typology, palaeoecology and stratigraphical implications. Developments in Sedimentology, Elsevier Scientific Publishing, 13:1-539 Link to comment Share on other sites More sharing options...
JUAN EMMANUEL Posted July 8, 2015 Share Posted July 8, 2015 It's a cephalopod alright. Yeah it would be wonderful if the thing could be freed from its matrix. Link to comment Share on other sites More sharing options...
aaronboydarts Posted July 14, 2015 Share Posted July 14, 2015 I just wanted to add it's a beautiful find and you found it in a beautiful place. Great work! Link to comment Share on other sites More sharing options...
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