Tiago Posted February 21 Share Posted February 21 Hello all, I found this fossil today at Portugal, Lisbon district, about 270 meters high. Anyone knows what it is? Thanks for your help. Best regards Quote Link to post Share on other sites
Rockwood Posted February 21 Share Posted February 21 I think it must be a heteromorph ammonite that had been encrusted by bivalves. 2 Quote Link to post Share on other sites
ClearLake Posted February 23 Share Posted February 23 Another option is a gastropod. I say that because it looks like it tapers to me and in some of the pictures I believe I see the columella on the inside. It would be a big snail, that for sure! Any idea on the age of the rock? 1 Quote Link to post Share on other sites
JohnJ Posted February 23 Share Posted February 23 @arthurvoss Quote Link to post Share on other sites
Scylla Posted February 23 Share Posted February 23 Looks like nerina gastropod Quote Link to post Share on other sites
fifbrindacier Posted February 23 Share Posted February 23 I agree this is a gastropod, i also see the columella. Quote Link to post Share on other sites
Rockwood Posted February 23 Share Posted February 23 3 hours ago, fifbrindacier said: i also see the columella. In the center of the object, or the object is, the columella ? Quote Link to post Share on other sites
ClearLake Posted February 23 Share Posted February 23 5 hours ago, Rockwood said: In the center of the object, or the object is, the columella ? The center part of a coiled gastropod is called the columella. You usually can’t see it except when a shell is broken open (as is the case here), although it also extends from the bottom of the shell in those forms with a siphonal canal. See the illustration below that I borrowed from the Geological Museum of Trinity College in Dublin website. The columella is circled in red. I believe the specimen in question is a portion of a gastropod with the columella exposed in a couple of places. 1 1 Quote Link to post Share on other sites
Rockwood Posted February 23 Share Posted February 23 1 hour ago, ClearLake said: I believe the specimen in question is a portion of a gastropod with the columella exposed in a couple of places. Yes. It probably is. I did notice the likely spiral shape, but I couldn't find one at the time. Quote Link to post Share on other sites
abyssunder Posted February 23 Share Posted February 23 Campanile? 1 Quote Link to post Share on other sites
fifbrindacier Posted February 24 Share Posted February 24 5 hours ago, abyssunder said: Campanile? According to its size, that would fit. Quote Link to post Share on other sites
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