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Showing results for tags 'replacement'.
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Mosasaur jaw with shark- and replacement tooth?
Jurassic_Nature posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello everyone, I was wondering which parts of this rooted mosasaur tooth are real. There is a second tooth in it which looks like a replacement tooth and next to it there is also a shark tooth. Can you tell if the bones of the jaw are real? I thought the bigger tooth could be glued on the root, like it's often the case with mosasaur teeth from morocco. And why is there a shark tooth in the bone? Any insight is appreciated. -
Hello, may I know how Spinosaurus replaced its teeth? After this tooth broke, I found that there seems to be a replacement tooth inside Thank you
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Need help in finding a replacement stylus for my dremel for working on rocks. Not like the one that comes with the Dremel. I ordered one years ago and can't figure out who carries these. 1 and 1/8 inches in length. Thanks Mike
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Chicago Pneumatic CP9361 Air Scribe Tips - Recommendations
Steve D. posted a topic in Fossil Preparation
Hey all! I have been building out (slowly) my prep lab and learning a ton! Early this year I invested in a air scribe and went with the Chicago Pneumatic CP9361 Air Scribe. I'm trying to locate information on different tips that would be applicable to this model but not coming up with much. Does anyone have any experience with this model and have any recommendations on either replacement or other tips that would be applicable to this model? My prep is mostly working with shale from south IN, OH, KY and Utah. Any help would be appreciated! ... (wife doesn't know this yet, but I'm looking into an air abrasive system next Thanks! Steve -
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 there growth tissue on the OUTSIDE of the stem that kept adding on calcium to the inside, like tree trunks creating wood and bark? (I can understand the growth of whorled type seashells, but I can't get this through my head.) 2) Many of the columnal discs/segments I have found are virtually solid silica, some with a glossy almost pearly luster, I suppose would be classified as flint, chert or chalcedony. I assume from what I've read that this is from replacement of the original calcium with silica over a long period of time. This may seem simple-minded or thinking too deeply, but do researchers claim to understand how the silica could actually have "moved" or migrated into the spaces where the calcium used to be? I can't visualize how this would be possible. Like, one molecule at a time gradually moves through solid rock? Does anyone understand why this seems so hard for me to visualize? Or is this believed to occur because the original calcium actually changes it's molecular characteristics without moving? Any input or comments would be greatly appreciated!
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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!- 3 comments
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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 post more of my finds from the area). I KNOW, I'll get to the point already. I'd just like some real feedback from folks who are more informed and educated in this area than I am. Here it is... and what do you think? Mineralization? Replacement of the softer tissues with minerals? I also have more what look to be different skulls, but some with holes in them and inside you can see bone, which the rock has encased. Found in Southern Arizona. I do apologize for the images being rotated in every direction.
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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 silicification, and are older specimens more likely to be formed through replacement, as it seems to be more durable and less likely to degrade?