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Found 5 results

  1. Hi all, This is a follow-on from the first post in my ‘Adventures in Thin Sectioning’ thread where I showed this fossil from the Aust bone bed. I wanted to have it scanned so that I have a record of both halves before I try to make histological sections of the ‘offcut’. Luckily, my department has a micro X-ray CT scanner (Nikon XT H 225ST) and when there was a gap in demand I was able to book time for a couple hours of scanning. I got three separate scans done, the two pieces of the Aust block done together and then two articulating fragments from the Woodhill Bay Fish Bed at Portishead which are full of upper Devonian placoderm and sarcopterygian fragments. Florists foam is used to hold the pieces in place during scanning as it is easy to press the rocks into and low enough density as to not interfere with the scan. The scan for the Aust block took a little over an hour, and after reconstruction the vertebra is differentiable. The scan isn’t brilliant due to the abundance of pyrite in the stone which scatters the X-rays but it should hopefully be good enough to segment out the bone by hand and make a 3D model, so mission accomplished! The scans for the Portishead material were much shorter exploratory scans (>30 minutes) but turned out better due to the lower density sandstone matrix and lack of pyrite. Both pieces are full of fragments of scale and bits of bone but the larger of the two has a couple particularly interesting features. A large ?spine which I haven’t yet identified: A fragment of jaw with three teeth, likely belonging to the Sarcopterygian Holoptychius: Using a free program called Drishti I’ve been able to quickly reconstruct the Portishead scans in 3D and while the differentiation between bone and matrix isn’t fantastic it is good enough to get an idea of the spatial arrangement of the fragments. I intend to spend some time learning to segment out the fragments individually in Dragonfly (another free program for working with slice data) but am currently struggling with a few bugs so that will have to come later. The two fragments as rendered volumes in rough alignment: A rough rendering of the locations of the bone/scale fragments in both blocks. I believe the majority of the scales are Holoptychius as it is the most abundant taxa in this deposit: Close up on the area with the fragment of jaw, the three teeth are clearly visible as well as the stumps of two others: Thanks for looking, let me know if you have any questions.
  2. Hello! I found this piece in Portsmouth RI this weekend on a shale beach (picture attached). I'm just not sure what the shale is attached to--- it *looks* like a piece of bone, but I've been doing some image searches and cant find anything really similar. Sorry for my hand in one- I couldn't get a clear shot of the edge otherwise. Thanks so much in advance - I appreciate any insights into what this might be! Emily
  3. Entropy

    Bones? Nautilus? Dunno

    Hi. Thanks for taking a look. Found this on family property. Curious what it could be. It's about two inches long.
  4. Hello! I am searching for anyone who does paid fossil excursions in CT. I'm coming there in July from FL. Grew up in Branford. My most prized possession was found at a geological camp when I was a kid 40 years ago... a dinosaur footprint and a fossilized rippled lake bed, I think from Hartford. Now I have tons of FL sharks teeth. Who can i pay to take my family hunting for CT fossils??
  5. Hello I recently came across what I think may be a fossil but I'm not sure what it is or if its a fossil for sure. It was found in Hamden Connecticut as part of a stone wall. That part of CT has a formation dating to Jurassic I believe.
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