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I had a crab concretion CT scanned and then 3D printed it
mamlambo posted a topic in General Fossil Discussion
I've always wondered what a crab concretion would look like when it was CT scanned and had the chance to do so recently thanks to the friendly people at Pacific Radiology here in New Zealand. The concretion contains a Tumidocarcinus giganteus crab from the Miocene of New Zealand. Here is the concretion I scanned, the legs were visible on the side so I knew a crab was inside: One of the slices of the crab after I loaded the DICOM images into 3D slicer. There were 203 slices. By segmenting the images, telling the program what is rock and what is not rock, you can create a 3D image for import into Blender or other 3D images to prepare it for 3D printing. The 3D mesh was made up of 770 142 triangles. After making it manifold (water-tight), I imported it into Cura to generate the GCODE for my 3D printer. It also adds supports to be able to print overhangs. Here is the 3D printed crab sitting outside the concretion. It is accurate in size. I also scanned a penguin concretion which is on my Sketchfab profile (https://sketchfab.com/3d-models/fossil-penguin-ct-scan-segmentation-take-2-dd9cb20684d4471dad2757ab8a53a548) Here is the video of the process: You can look at the 3D model on Sketchfab: https://sketchfab.com/3d-models/ct-scan-of-fossil-crab-inside-concretion-25f26cb23a6046419521ed2422d5741d- 13 replies
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I bought this Keichousaur fossil online recently, before discovering this forum and finding out that fake fossils are common, and Keichousaur are commonly faked or embellished. I did have concerns that this may have been fake, though I think I've managed to work that out myself now thanks to a handily available xray machine. Still, confirmation would be nice and I thought this may be of interest. It is claimed to have come from Fuyuan County, Pengjiang, Yunnan, China
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I have two associated Hyaenodon horridus mandibles from Nebraska. They puzzled me because they appear to be from an adult but when I removed some matrix is saw gaps for a molar and a tip of tooth peeping out. I looked into it and it seems that the last molar doesn't reupt until age 3-4 so that is roughly the age of this animal. To verify, I asked a good mate to xray it. You can clearly see the tooth roots below the crowns of the teeth and below the gum line (ie embedded into the bone). You can also clearly make out the mandibular canal (long dark line running ventrally (below) the teeth - it's where the major veins, arteries and nerves of the bone run. Great view of millions of years old bone and teeth! Confirms that the teeth are erupting molars and gives me a great idea of the age. Not, quite juvenile, more like subadult.
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From the album: Badlands, Nebraska megafauna.
The two associated Hyaenodon horridus mandibles from Nebraska puzzled me because they appear to be from an adult but when I removed some matrix i saw gaps for a molar and a tip of a tooth peeping out. I looked into it and it seems that the last molar doesn't reupt until age 3-4 so that is roughly the age of this animal. To verify, I asked a good mate to xray it. Th huge erupting molars are clearly see in the imagine. You can also clearly see the tooth roots below the crowns of the teeth and below the gum line (ie embedded into the bone). You can also clearly make out the mandibular canal (long dark line running ventrally below) the teeth - it's where the major veins, arteries and nerves of the bone run. Great view of millions of years old bone and teeth! Confirms that the teeth are erupting molars and gives me a great idea of the age. Not, quite juvenile, more like subadult.