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Found 8 results

  1. I recently acquired a small Araucaria cone and I am wondering what the general opinion on cutting/polishing fossil pine cones. Should it be cut to show off the internal structure or is it best to just leave it as a whole specimen? How do you feel about modifying fossils in general to enhance aesthetic, rather than scientific, value? I am interested to hear the Fossil Forum's opinions.
  2. Hello Fellow Fossiliers!! So whilst on a field trip with the OUGS in Lyme Regis the other day I stumbled upon this rock which has a bivalve and a partial (what would have been huge) ammonite in it. As you can see the ammonite has undergone mineral replacement and has crystallised, seen as its not really structural intact from the outside and seems to only be 1/16th of a complete fossil would this look good if I sliced it in half to open up the inside? And, if so, seen as I have no real prepping/cutting tools to speak of how would you recommend I go about it? I have asked a local mason to run it through their machines, they quoted £30 max depending on how hard the stone ends up being, I would prefer to do it myself and have the tools and ability to do it again should i need to. It stands roughly 18cm high on its end as picture. Thank you all in advance for your opinions and advice!
  3. So I'm aiming to visit some of the Altamira Shale (Monterey Formation Shale) exposures in my city and try to find some fossils in fallen shale pieces. However, I simply cannot find a good way to split shale (I also have small rocks of Altamira Shale in my backyard, which could be seen as a sort of "practice"). The shale that I get are usually very hard and compact, as seems to not crack very easily with the materials I have. I don't have a real chisel, but I makeshift them (nail, screws, and screwdrivers). When I use them, it seems to just dig a hole in the area where I'm striking at and creates no cracks. Does anyone who has experience with Monterey Shale know the best way to split a shale like this, preferably clean in half? (It seems that the rocks I'm trying to split are the exact same rocks found in any other part of the Monterey Formation, like Jalama Beach)
  4. A slice of life...

    ...or at least it used to be alive. A friend of mine offered to give me a few of his unprepped ammonites in exchange for a bit of work for him. He asked me to cut, sand and polish a Macrocephalites ammonite for him which he suspected might show some nice interior designs. And he was right. I only took a photo of it moistened after cutting and before sanding and polishing and didn't think to get one of the end product before I gave it back to him, but I think you can already imagine how nicely it turned out in the end, don't you think?
  5. Hi everyone I recently got a large sandstone block (~20cm x 20cm x 20cm) which is like a shell deathbed (see pics). There's a layer of weathered material on the surface but underneath it's a nice piece. I was wanting to try and clean it up and do something nice with it. My ideas were to either (1) square it off and polish the block or (2) Square it off and slice it into multiple thin slabs (maybe 2-3cm thick) which could then be polished. I'm not sure if it's bad practice to slice up a fossil or not. Anyway, I was hoping someone might be able to give me some advice on what tools would be appropriate for cutting a block this size or how to go about polishing the block afterwards. Alternatively, if anyone has any other cool ideas for it I'd be keen to hear them. Any advice would be really appreciated! Cheers
  6. Diamond blade coolant

    As part of my fossil preparation process I have the need to reduce the size of the background rock on some specimens collected in the field. My preferred tool is a 300mm slab saw I acquired a while back made for lapidary work as this has very little vibration. Normally if I use it to cut agate or similar rock I use the cheap home brand baby oil, works a treat, good for the hands and no smell after. On the test piece I did with the softer stone the oil permeated into the rock base and the fossil and cleaning in detergent straight after only got the surface clean. I doubt the baby oil will harm the fossils but suspect it will prevent permanent gluing of damaged material and leaves and oil stain that I do not want. I tried a second piece and painted the surface with paraloid to seal, but the cut edges still stain. So currently I drain the coolant from the saws sump and replace with water cut the fossils and then drain the water from the sump as the water will cause the diamond blade to rust. The question - does anyone know of a coolant that can be used that will not seep into the softer fossils / rock and will not rust the diamond blade? Mike D'Arcy
  7. Ancient Hand Axe?

    Hi guys, I found this and felt I should share and see what you think: Ancient Hand Axe? First, I was struck by the 'cutting edge', which seems used, and has radiating shock marks from the edge, inward. There also seems to be debris in the cutting area, one piece contains 2 small, thin inset hairs, light brown in color, which I've bagged. The ergonomics are amazing. The mass of the stone fits neatly in your hand, while there appear to be wear marks where your index finger and thumb might go. Also, when held in that manner, the cutting edge is parallel to your cutting surface.
  8. Cutting matrix

    What do you guys use for cutting down matrices that are err rock hard? I've thought of a tile saw but unless a lot of money is spent then the depth of the cut is really small, 25mm/1in. Would an angle grinder with a concrete blade work? Thanks John
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