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Found 4 results

  1. Jung, P., Baumann, K., et al. (2020). Desert breath—How fog promotes a novel type of soil biocenosis, forming the coastal Atacama Desert’s living skin. Geobiology 18:113–124. PDF Of interest to those who study/like to know more about: - the varied ways in which Earth's biota influences/can influence the surface of our planet - exobiology - Precambrian geology - soil formation and preservation - the interaction between edaphic (geomorphology,precipitation)factors and microbiota - geomorphology - the global carbon and nitrogen cycle - ecosystem formation Skippables: page 114 to part of page 117 are mostly methodological(although I found the remote sensing part interesting) wraasamolovJungbendix_al-aridesatacamericabsol2020Geobiology.pdf
  2. I’m going through my finds from my last hunting trip and came across these brachiopod valves that I picked up. I grabbed them, not because they were the best preserved finds of the day, but because they are the worst. To clarify, I believe the initial preservation wasn’t too bad, but it’s the weathering and subsequent degradation of the fossil that caught my interest. Most valves that I find in the area (Upper Ordovician road cut) are in pieces. I presumed it was because the valves weathered out of the matrix and THEN were washed around by rain run off, trampled, exposed to the elements, etc. before breaking into pieces. However, these valves are cracked while still being attached to the underlying matrix. They remind me of mud that has dried in the sun. It seems to show that some of the valves at least cracked and split BEFORE coming completely out of the matrix. Then they weather out in pieces. I find it interesting to see examples of them in the middle of the process. The matrix looks like dirt in the picture, but it is hard as rock and the valve fragments are stuck fast. I think this is what is known as mudstone(?). I’m sure the fragments would come off with a little dental pick work, but they are not so loose as to brush off or come off by picking with the finger nail.
  3. 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.
  4. Ordovician Cephalopod

    From the album Fossils in the Wild

    Edgar Evins State Park. Ordovician cephalopod fossil weathering out of the rock on the shore of Center Hill Lake, DeKalb County, Tennessee.
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