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This is a Topic dedicated to DIGITAL FOSSIL PREPARATION. It is intended to be a repository/consolidation point for all topics concerning digital fossil preparation. Technology has come a long way, and now, more frequently, is being used as a means of Fossil Preparation. Getting a digitized scan of a fossil still in the matrix can be a game changing use of technology. Please post any relevant links to previously posted topics concerning CAT Scans, X-rays, or Digital modelling/3D printing. I'd like to personally thank @Doctor Mud for proposing this idea.
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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.
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I know a lot of people have posted like this but,... this really has me and a couple geologists here in TX perplexed. My dad found this in Oregon in the 1960's. It was not anywhere near a riverbank but rather, was sticking out of a sidehill. It is translucent almost like quartz, has indentations where it appears it was once soft (see close up) and I recently took it to my vet who x-rayed it and it appears to have a uniform inner density different from the exterior see x ray. Are there better x rays out there? Thanks Much
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- dinosaur egg
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This fish fossil is from the Green River Formation, These fossils are enclosed in a thin layer of shale. The vertebrae are 33mm long, possibly Knightia? On the left upper edge of the rock is a fin. I had a x-ray taken and I see several straight pin shaped ribs? However they are a poor match for ribs described in "Paleontology of the Green River Formation, with a review of the fish fauna" (Grande, 1984). These "ribs" are very straight. There is also the central rod-like thing, which is perhaps plant material? I thought a X-ray would review hidden secrets, but it hasn't really adding anything I couldn't see with my naked eye. This forum is a joy to browse. I'm very appreciative of the responses I've gotten from my previously ID requests so far. I am certainly learning! Any ideas as to what I'm seeing?
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From the album: expansa1's Album
This X-ray scan using different exposure factors shows the egg's internal structure in greater detail.© ©
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- Raptor egg
- Raptor egg X-ray
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From the album: expansa1's Album
Australia Zoo took some X-rays of this egg using different exposure factors to see what was inside. They discovered an anomaly that they best described as being an embryo inside.© ©
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http://www.bbc.com/news/science-environment-27502354