Jones1rocks Posted August 8, 2017 Share Posted August 8, 2017 I'm at a loss here. This is perhaps the most unusual of the Mazon fossils that I have come across, and I don't recall seeing anything quite like it in the photographs posted here, but I could have missed something. This is from an old collection of Mazon pieces, and, for an unknown reason, is one of the few that has a lacquered or sealed surface. The concretion, as an intact nodule, measures 2-3/4" x 2-1/2", and the fossil inside is roughly 2-1/2" in length. Any ideas? ~Paul Link to comment Share on other sites More sharing options...
snolly50 Posted August 8, 2017 Share Posted August 8, 2017 Shark egg case!?! It resembles the illustration in the ESCONI Mason Creek ID book. Human beings, who are almost unique in having the ability to learn from the experience of others, also are remarkable for their apparent disinclination to do so. - Douglas Adams, Last Chance to See Link to comment Share on other sites More sharing options...
oilshale Posted August 8, 2017 Share Posted August 8, 2017 I would also guess Palaeoxyris. Might be P. prendeli Lesquereux, 1870 (or P. helicteroides Morris?). Thomas Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
deutscheben Posted August 9, 2017 Share Posted August 9, 2017 Yes, I agree with the Paleoxyris ID too, although identifying the species is beyond my knowledge. Link to comment Share on other sites More sharing options...
Nimravis Posted August 9, 2017 Share Posted August 9, 2017 I agree with everyone else- here is one of mine for comparison without lacquer. Some old time collectors were known to coat there finds in lacquer to preserve them, not knowing that it was really damaging the fossil. Link to comment Share on other sites More sharing options...
oilshale Posted August 9, 2017 Share Posted August 9, 2017 3 hours ago, Nimravis said: I agree with everyone else- here is one of mine for comparison without lacquer. Some old time collectors were known to coat there finds in lacquer to preserve them, not knowing that it was really damaging the fossil. I fear this guy used Elmers (white glue) - lacquer would be (almost) fine (Paraloid would be reworkable). Elmers is great for gluing wooden parts, but it is not when used as a coating. As you can see in the second photo, a coating with Elmers tends to get whitish and picks up a lot of dirt with time. BTW, very nice Palaeoxyris carbonaria Schimper, 1830 (= P. appendiculata Lesquereux, 1870). Wall Chart - Adhesives and Consolidants - Kopie.pdf Davidson_and_Brown_2012_Paraloid_B-72-_Practical_tips_for_the_vertebrate_fossil_preparator - Kopie.pdf Might be interesting: Chondrichthyan egg capsule card.pdf Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
Nimravis Posted August 9, 2017 Share Posted August 9, 2017 34 minutes ago, oilshale said: I fear this guy used Elmers (white glue) - lacquer would be (almost) fine (Paraloid would be reworkable). Elmers is great for gluing wooden parts, but it is not when used as a coating. As you can see in the second photo, a coating with Elmers tends to get whitish and picks up a lot of dirt with time. BTW, very nice Palaeoxyris carbonaria Schimper, 1830 (= P. appendiculata Lesquereux, 1870). Wall Chart - Adhesives and Consolidants - Kopie.pdf Davidson_and_Brown_2012_Paraloid_B-72-_Practical_tips_for_the_vertebrate_fossil_preparator - Kopie.pdf Might be interesting: Chondrichthyan egg capsule card.pdf I forgot to mention that others would brush egg whites onto Mazon Creek fossils to create a shiny protective barrier- left untouched, some of these grew some type of mold on the fossils. I always just leave mine as they open. Link to comment Share on other sites More sharing options...
Doctor Mud Posted August 9, 2017 Share Posted August 9, 2017 9 minutes ago, Nimravis said: I forgot to mention that others would brush egg whites onto Mazon Creek fossils to create a shiny protective barrier- left untouched, some of these grew some type of mold on the fossils. I always just leave mine as they open. Gosh - brushing on egg whites or any food based "preservative" would seem to be asking for trouble! Link to comment Share on other sites More sharing options...
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