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Found 5 results

  1. I have one more small Triassic Diplurus coelacanth fish collected many years ago in North Bergen, New Jersey. The fish's head is slightly lifting off the shale matrix along its top and bottom, but remains well attached at the front and back of the head -- see the photos. The lift gap along top and bottom is at most 0.5 to 0.67 mm. Pressing on the head results in a micro-movement down. With careful handling, I don't believe that the head is in any danger of fully detaching. I have little background in prep work, so I would like to ask opinions on: Should anything be done to cement the head down? And a related question: what cementing technique can be used given that the gap is under one mm. I appreciate any thoughts on this.
  2. Diplurus Prep

    Here’s a before and after look at a small Diplurus newarki that I just finished for another TFF member, @LoneRanger. This is small and well preserved minus a nasty coating of pyrite on most of the fossil. This prep took 7 hours to complete. Tuesday, I started another specimen that is even smaller! These were collected before I was born! Can you find the fish? Hint, I scribed on it a bit before I thought to take a pic...
  3. Coelacanth Prep

    @Jeffrey P has issued quite a challenge with a request for preparation of a small coelacanth. This little guy appears to only be missing the tip of the head. Unfortunately, the rest is under a thin layer of diamond hard shale! Here's a pic of the specimen as it arrived. Where's Waldo? Only parts of the skull are exposed with a hint of the caudal fin under the matrix. Here it is after 4 hours of prep. This guy is a textbook example of sticky. I'm switching between 3 tools to prep this. I start by removing about 1/2mm of matrix with the Aro. This is kind of like doing dental work with a jackhammer but if you're careful, it will get you down to the later just above the bone pretty quickly. Then I switch to the Micro Jack. The problem with the scribes is that the matrix turns white when you scribe it... and the bones are white! I scribe away for about 10 minutes with eagle eyes out for any hint of bones (this uncovers an area about 5mmx10mm) and then hit it with abrasive to knock off the scribe marks so I can see the bones against the matrix.
  4. Diplurus newarki (Bryant 1934)

    From the album Pisces

    Coelcanth Tail fin. Enhanced with beeswax finish. A gift from Jeffrey P. Lockatong Formation, Newark Supergroup, Upper Triassic. Found at Granton quarry, North Bergen, NJ.
  5. Triassic coelacanth

    From the album Fossildude's Late Triassic Lockatong Formation Fossils

    Late Triassic coelacanth, Diplurus newarki. Newark Supergroup, Newark Basin, Lockatong Formation, North Bergen NJ. Collected on 2/19/2017

    © 2017 Tim Jones

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