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bassebus's Achievements

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  1. I should change my post header since i know much more about this. Here's the response from the Swedish Natural History Museum. Very cool. Thanks @Morlock for the link. ------- Hello Bassebus, Thanks for the email. I think I can answer your question. It is very much a fossil of a so-called orthoceratitis you have here. It is an extinct group of octopuses that had most of their body enclosed in a long, straight shell. This specimen is only part of the whole animal (which could be several meters long). The outer wall of the shell itself is ground away, and what we can see is the inner part of the shell which was divided into chambers by many small walls (the white transverse stripes). All chambers are filled with the mineral calcite (white areas) and calcareous clay (reddish areas) which have filled the cavities in the shell after the animal's death when the shell was on the seabed before it became a fossil. The longitudinal wide stripe that can be seen in some of the pictures is a so-called siphuncle, a tube that went through all the chambers in the entire shell and which was filled with living tissue when the animal was alive. With the help of it, the octopus could regulate how much water and gas was in the shell's chamber to balance the shell and change position in the sea (rise to the surface if there was more gas and sink again with more water. Much like a submarine. You can see that the ridges are quite wide and that the sieve sparkle is at the bottom and is quite wide. This allows us to identify this octopus. It belongs to the genus Endoceras (see the picture of a reconstruction of Endoceras above). It was one of the largest animals of its time and may have been one of the most important predators in the sea before fish with teeth and jaws developed. Endoceras was very common in the sea that covered Sweden during the period Ordovician (485-440 million years ago). The color of the stone inside the chambers also fits well with the fact that it would be a Swedish fossil you have. Maybe from Öland, where these octopuses are very common in the limestone that was formed during the Ordovician. You can see many similar fossils in floors and stairs in older public buildings, which are often made of Öland lime. You can easily find your own copies there and in several other places in Sweden. On the Swedish Museum of Natural History's website, you can read more about the time period ordovicium and the animals that lived during that time:https://utstallning.nrm.se/4.4f4d16d8151338bf60390306.html#ordovicium I hope this answer gives you a little more information about your fine fossil! Have a nice summer! Christian Christian B. Skovsted Deputy Head of Unit First Curator, Evertebrate Paleontology Department of Paleobiology Swedish Museum of Natural History
  2. This is great. I will. and i'll update this thread with any further findings. thanks.
  3. Thank you all (well, most :-)) for great responses. Special shout-out to @Bedrock Bob and @Terry Soloman for getting me on the right (i think) track. Even though it seems my piece is too large for a Machaerid, your input landed me on an Orthoceras Fossil. I found this image which i think is fairly similar to mine (also the size is pretty much identical. Now I just need to find a cross section to compare with. Also, Orthoceras fossils are apparently common in Sweden, which makes sense since that's where my family originates from. Again - thanks a bunch!
  4. well, it has certainly been found naturally - then cut/polished (unfortunately). looking around the internets, i'm starting to wonder if it's stalagmite?
  5. Hello everyone, I came across this in my father's collected items. I know absolutely nothing about rocks, minerals and fossils, but i'd love to know more about this piece. Perhaps it is very straightforward.. Unfortunately, I have little background information on it as well. It could have been acquired either by my great grandfather who journeyed from Sweden to North America and traveled across the continent, trading stuff, OR by my grandfather in Sweden, who, as a fine-watch repairman, would settle for payment in things he was offered and liked, should the customer come up "a little short" on payments. Here are some snapshots, and would greatly appreciate some thoughts! thank you. https://photos.app.goo.gl/MFbmQEJhxdfvbUkMA
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