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Found 5 results

  1. Petrified wood

    My father dug this piece of petrified wood from a riverbed outside of Texarkana Arkansas approximately 25 years ago. He passed away in 2009 so I never got any more information from him regarding it. My question is how would I go about polishing it or just sealing it from the climate? The crystals are what I'm concerned about with the idea of polishing it.
  2. part one cavaliersmithrslrstb20150476.pdf (less than 0,8 Mb) The name of the author, one of the big thinkers on the phylogenies of several phyla,was one of the things that attracted me to this piece part two:the response DufourMcIlroydiscussommerslcambrianeventexplosioediaca2017.pdf less than 1 Mb outtake: outtake from the response:
  3. a metabolism? I've read in many places now that "life" is very difficult to define. A big question in biology, paleontology, or science in general is "what is life?" or "how do we define life?". NASA's definition is "A self-sustaining chemical system capable of Darwinian evolution". But I'm just wondering why life shouldn't be defined as "anything with a metabolism". Has anything ever lived that didn't have a metabolism? Is there anything that is non-living that does have one? Thanks. Scott
  4. Fish fossil ~ID

    Dear experts, As my first step, I'll preciate any information about this fish fossil of my own. It is about 21" large and has a gross weight of more than 10 pounds. Thanks a lot in advance for your valuable help.
  5. Hi everyone! I'm new here, but I plan on being an active poster. Geology and paleontology are my passions. I was out at Calvert Cliffs yesterday and the erosion is in full-swing, yielding many a Chesapecten. I also came across plenty of iron sandstone concretions. Everything I have read on the web is about the Navajo concretions in Colorado which are spherical. Obviously these are not spherical and their abundance at the cliffs in all manner of shapes and sizes is intriguing. I was wondering if any of you know how these formed? My geology professor was stumped (he has a doctorate in invertebrate paleontology, not geology, so I can understand). Here are a couple in situ inasmuch as this is where they landed after eroding out of the cliff face. I realize I am guilty of a major faux pas by not including something to scale these formations. One of the photos you can see my shoe so it gives some inkling as to their size. However, I figure you have plenty of experience among you all to know exactly what it is I'm talking about so hopefully this isn't an issue. https://www.flickr.com/photos/alliecat1881/15642517576/in/photostream/ https://www.flickr.com/photos/alliecat1881/15046115813/in/photostream/ I am really looking forward to some insight! Anyone who somehow has yet to acquire a Miocene bivalve, now's your time! https://www.flickr.com/photos/alliecat1881/15479680839/in/photostream/ -Allison
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