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I have a Tridenticeras peramplum ammonite steinkern from the Austin Chalk that has part of it incrusted with algae/moss from sitting in a small creek where I found it. What would be recommended to clean moss off of chalk fossils, not just ammonites? What ever the method that is recommended I would first try it out on a fossil-less chunk of chalk to make sure that the process wouldn’t be detrimental to the matrix. I also don’t want to scratch the fossil by scrubbing it with something overly abrasive since the matrix weakens when wet. I usually use a soft bristled toothbrush for cleaning dirt off of specimens. Would that enough? Thanks in advance!
Weathering of rocks by mosses may explain climate effects during the Late Ordovician, Stockholm University, July 7, 2016 http://www.aces.su.se/weathering-of-rocks-by-mosses-may-explain-climate-change-during-the-late-ordovician/ https://www.sciencedaily.com/releases/2016/07/160707101029.htm The paper is: Porada, P., T. M. Lenton, A. Pohl, B. Weber, L. Mander, Y. Donnadieu, C. Beer, U. Pöschl, A. Kleidon. High potential for weathering and climate effects of non-vascular vegetation in the Late Ordovician. Nature Communications, 2016; 7: 12113 DOI: 10.1038/ncomms12113 http://www.nature.com/articles/ncomms12113 Yours, Paul H.
Well this was my 5th time going to GMR and GMR has never been to good to me. Everytime I went i would find broken, worn, and just terrible teeth. This time was just pure Awesome! I woke up at 7 sharp and my mom was on the computer looking at the forcast......NOT GOOD. But eventually we left and it cleared up! As we arrived we checked 5th street and wow....Not good it was deep! then we drove over to 10th street and it was still bad. Mom was afraid of the water and the trash on the bank so she decided to sit in the car I put on my leg waders and jumped in! It was up to my thighs and was not a bad temperture. i Build a make-shift sifter stand in the water out of cement blocks and bricks in the stream because I did not have pool noodles on my sifter. I was excited and put my first shovel in my screen and saw the usual gmr broken goblins and belemites. After a couple of screens later i found a nice porbeagle shark tooth, then after an hour of nothing good at all i found a mosasaur tooth (i think). Then about 30 minutes later i scored my first great white shark tooth ever! When i was digging i saw a huge tooth on the side of my shovel and it was so close to falling off! luckily I put the shovel full of gravel in my sifter and yanked it out. Wow it was a complete, all serations intact, tip intact, and a full root. The root is choclate brown, And the blade is blue with some tan stained into it. what a day. Thanks gmr!