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Found 5 results

  1. Silurian - crinoid vertebra?

    Central PA, Mifflintown-Bloomsburg (undividied) Block collected from roadsite float. Its pretty variable, with a flaky/fissile layers alternating with slightly more cohesive ones. Lots of broken brachiopod bits. For an experiment to I dropped an unremarkable flake the size of a large coin in some vinegar and let it soak for a day. The flake had a couple brachiopod bits and I wanted to see if they would fall free or dissolve in place. The brachiopds disappeared and I was left with this (see pics). Of course I got really excited and thought I had an early fish spine, but now I think I dissolved a crinoid stem and what we see is the matrix that filled in the soft bits. What do you think? Total length is 3/4"
  2. I have zillions of rocks/shells/fossils/pieces of bone, etc. I am not a chemist, and I do not want to get into anything unnecessarily dangerous/toxic. Also, I would love to possibly cut and polish rocks that I find fascinating. What do I need for my “starter kit”, and can you/will you please recommend sources for these items that you work with, and that you like and trust (especially a source with great patience to answer the tons of questions I will have). Thank you- Karen
  3. (Not sure of the tags I should use.) This is the first instance I've found of any sort of 'bloom' on a fossil in my collection. Luckily it's not the best specimen but it is an echinoid and they are not as easy to find here as in some other places. Sandstone from the Haslam(?) Fm on Vancouver Island. Is this a calcitic bloom from some sort of acid or off-gassing from something in my storage media? I'm not sure how long this has been in this condition but I think it's happened within the last 10 years. I'm trying to keep things away from my collection that might cause this sort of thing. I've got wooden (not oak) cabinets, and the little white fold-up boxes with cotton or cloth substrate. I'm trying to get rid of plastics, foams or anything else questionable, and I can't think of what else there might be that could be a problem, unless simple humidity in the Summertime will do it. (This is indoors)
  4. Captorhinus aguti prep

    Hi Fossil Forum, I've recently picked up a unprepped skull of Captorhinus aguti, from Olkahoma and am looking to do some further delicate prep. I've not used acid preparation before on such a delicate specimen (such as Muriatic acid) - could anyone who has give some advice about application, duration and dilution levels? Many thanks Tom
  5. Buffering acetic acid

    Hello, Long time occasional lurker, first time poster; I hope this is the appropriate place and method for posing this question, and I apologize if it is not! I have some limestone blocks containing conodont teeth and shark teeth, which I would like to break down with acetic acid. From what I have read, adding a buffer to the acid solution would greatly help in preventing damage to the teeth (and especially the roots), but I have no idea what buffers are readily available (and from where they would be available) and commonly used (and how much is needed). Can anyone advise? Any experience you've had with buffering acetic acid for dissolving limestone matrix to retrieve small teeth that you'd be willing to share would be greatly appreciated! Much thanks! :-)
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