Napoleon North Posted January 14, 2017 Share Posted January 14, 2017 Hi This is fossil?Probably not, but I prefer to ask. Location: near hole cave,Twardovski Cave ,Kraków, Southern Poland Age:? Link to comment Share on other sites More sharing options...
Peat Burns Posted January 14, 2017 Share Posted January 14, 2017 Could be late-Pleistocene or Holocene "sub-fossil" or recent. It's probably going to be very difficult to know for sure in that kind of environment. I believe this specimen is a terrestrial species. Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 14, 2017 Share Posted January 14, 2017 I also think it is a terrestrial snail. Visually it makes me think about a planorbe but is the fossil flat or not ? "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Napoleon North Posted January 15, 2017 Author Share Posted January 15, 2017 And this shell? Link to comment Share on other sites More sharing options...
britishcanuk Posted January 15, 2017 Share Posted January 15, 2017 This is a modern snail shell. I have been collecting terrestrial gastropods shells for years and this is typical of a weathered shell. If it was at the surface it is probably less than 10 years old. Link to comment Share on other sites More sharing options...
Peat Burns Posted January 17, 2017 Share Posted January 17, 2017 Visual appearance of late-Pleistocene and Holocene "subfossils" (i.e. not "mineralized") vs. recent macro-remains can be deceiving, and therefore is not a good means of estimating relative age. One must have a diagnostic stratigraphic context or a diagnostic biological associate / assemblage (for relative dating) or some kind of radiometric date (for numerical dating). As an example, this picture shows the freshwater gastropod Helisoma (Planorbella) campanulatum on the left and the freshwater bivalve Sphaerium sp. on the right. Both of these were recovered from a marl stratum in a wetland and were directly associated with a mastodont skeleton radiocarbon (14C) dated at over 11,000 years old. Note the portions of the periostracum still present on the bivalve. This next photo shows the same two species. But rather than having been excavated from deep within wetland sediments, I plucked these out of a stream last summer, and they are likely not much older than 1 year of age. I do believe that the terrestrial snail from the cave is likely modern, but that presumption is not based on the appearance of the shell. 1 Link to comment Share on other sites More sharing options...
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