tuscarora-th Posted March 21, 2009 Share Posted March 21, 2009 I had posted this rock along with other fossil pics in another thread. Im wondering if the rock formed this way or did some external element create the rings and the nodules? on this rock. There pretty common in my yard. Lots of limestone and quartz. Thanks, Mike Link to comment Share on other sites More sharing options...
PaleoRon Posted March 21, 2009 Share Posted March 21, 2009 I had posted this rock along with other fossil pics in another thread. Im wondering if the rock formed this way or did some external element create the rings and the nodules? on this rock. There pretty common in my yard. Lots of limestone and quartz.Thanks, Mike Some rock types start to form from a central "core" and grow/add layers of material like an onion. Others do the exact opposite, like when minerals fill a void or cavity in the rock/ground. A good example of the second type is a banded geode with a hollow center. Link to comment Share on other sites More sharing options...
Auspex Posted March 21, 2009 Share Posted March 21, 2009 Chert is a sedimentary rock, and the bands may be artifacts of layering, diagenesis. or both. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
tuscarora-th Posted March 21, 2009 Author Share Posted March 21, 2009 When I first saw one I thought maybe it was a geode. I was all excited. Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted March 21, 2009 Share Posted March 21, 2009 They are beekite rings; which is a term used to describe that type of structure. See this. Link to comment Share on other sites More sharing options...
tuscarora-th Posted March 21, 2009 Author Share Posted March 21, 2009 thanks guys. Solious that was one in depth article. I guess the next thing is to smash a couple and study the layering for myelf. Pretty neat if they float. i'll try floating them before I smash them. As always thank you, Mike Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted March 21, 2009 Share Posted March 21, 2009 I don't think that that one will float. The article was referring(I think) to brachiopods that, either didn't break the surface tension, or were strophomenids(I would assume... because of their shape). Link to comment Share on other sites More sharing options...
Dicranurus Posted March 28, 2009 Share Posted March 28, 2009 Nummulites? "It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living." -Sir David Attenborough Link to comment Share on other sites More sharing options...
Auspex Posted March 28, 2009 Share Posted March 28, 2009 Nummulites? I don't know if that works with the concentric circles. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Frank Menser Posted March 28, 2009 Share Posted March 28, 2009 It does look a lot like some agate geodes I found in S. Texas. Be true to the reality you create. Link to comment Share on other sites More sharing options...
Dicranurus Posted March 30, 2009 Share Posted March 30, 2009 How about this? http://4.bp.blogspot.com/_ZHv_I4h7INY/SbIF...a-alternans.jpg "It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living." -Sir David Attenborough Link to comment Share on other sites More sharing options...
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