CoyoteAbides Posted May 5, 2022 Share Posted May 5, 2022 I found this along the central Oregon Coast. I was so curious about what it looked like inside, so I cut it in half. I was thinking maybe some type of reptile or amphibian egg. It looks like something seeped into the "Egg" rock that created the black discoloration on the edges and some interior parts. Any idea on what this might be would be greatly appreciated. Link to comment Share on other sites More sharing options...
Ludwigia Posted May 5, 2022 Share Posted May 5, 2022 This is not an egg. Please study this. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted May 5, 2022 Share Posted May 5, 2022 (edited) In general terms that's what is known as a thunderegg. Strictly geological work of Mother Nature. Google it. There are many, many different minerals that can be responsible, so I can't be any more specific than this. Edited May 5, 2022 by Mark Kmiecik fix typo 1 Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
DPS Ammonite Posted May 6, 2022 Share Posted May 6, 2022 Not a thunder egg which is an expanded cavity in rhyolite containing minerals such as chalcedony, agate, quartz and opal. It looks like brecciated chert or jasper. Fluids altered the outside and part of the interior along cracks. https://en.m.wikipedia.org/wiki/Thunderegg 1 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted May 6, 2022 Share Posted May 6, 2022 7 minutes ago, DPS Ammonite said: Not a thunder egg which is an expanded cavity in rhyolite containing minerals such as chalcedony, agate, quartz and opal. I stand corrected. You are right. I should not have assumed that since it is from Oregon it's a thunderegg. Now that I have made myself familiar with the formation and composition of thundereggs, I won't make this mistake again. Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
supertramp Posted May 6, 2022 Share Posted May 6, 2022 (edited) It looks like an altered (serpentinized) ultramafic rock. Is it possible considering the geology of the area? ciao Edited May 6, 2022 by supertramp Link to comment Share on other sites More sharing options...
abyssunder Posted May 7, 2022 Share Posted May 7, 2022 There are nice percussion marks! " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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