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Showing results for tags 'replacement'.
Found 7 results
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I purchased several of these inexpensively as giveaways for children. The dealer was somewhat clueless as to the origin. I don't normally buy fossils but I assume they are commonly offered for sale since they were so cheap. Does anyone recognize where these are from and any other bits of information? They seem relatively heavy, almost like hematite replacement. Picture of a representative example:
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Raptor skulls? Permineralization? From meteor impact? Heavy as heck?
Kodysheeran55 posted a topic in Fossil ID
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Picked from mix of QT, QAL, and Eagle Ford gravels. I love calcite but it can be deceiving, not sure if this was replacement of something or naturally formed structure, appears to be fossilized something. Curious about the red, mineral staining maybe? Last pic is view from above.
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Hello, I have many crinoid columnals that I collected in gravel (I suppose it was river/creek gravel collected and sold by a "sand and gravel" company) in Illinois many years ago. I have two questions that may be obvious to more seasoned fossil hunters/students. 1) Exactly how did the crinoids actually grow, meaning, how did the stems' diameter expand horizontally in size as time went on, since the stems were mostly composed of hard calcium carbonate/lime. In other words, it seems that once they are "hardened" or "frozen" into a certain size, how can they get bigger? Was the
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From the album: Marine reptiles and mammals
Mosasaur tooth with the replacement tooth still in place. I always wondered what the weird round/oval holes were on the side of mosasaur roots. Finally it all falls into place! -
Hello everyone, this is my first time posting, I absolutely love this forum. I've decided to register and dive head first. I've recently moved back to Southern Arizona from Florida and I have rekindled my love with rocks, and now fossils, since it would seem I've been finding many of them from all of the ages. Please help me identify this find, it looks carnivorous of some sort, it would be cliche to say it looks like a raptor, but indeed it does. It would be hard for me to believe that this is a fake, since there is also tons of evidence that would point to this being real. (If it is, I'll po
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I'm a bit confused with terminology. I always assumed that the fine micro crystalline wood was made through replacement, and therefore the micro structure was very fine, and the specimen was very hard..Picture 1 Where as the coarser fossil wood was formed through silicification and this wood is generally softer and younger than specimens formed by replacement.Picture 2. ( In fact, when looking at the specimen in picture 2 in hand, it is hard to believe this isn't just wood, although it does have pockets with crystals (picture 3). ) Are there obvious features to determine replacement versus
