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Showing results for tags 'calcium carbonate'.
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The Amateur Paleontologist posted a topic in Fossil PreparationHey everyone, hope you're all doing well! From what I've read, small shark/fish teeth can be occasionally encountered by dissolving samples of chalk/limestone in acid. I read Jeppsson et al's 1999 paper on using buffered acetic acid to extract phosphatic fossils (in my case shark teeth), but the method outlined is not that simple and requires access to certain laboratory equipment I don't really have access to right at the moment... All I have is some cheap white vinegar, and some trays and tins I've got some samples of chalk from the Late Cretaceous of Møns Klint, a fossil site in Denmark with relatively diverse fish and shark fauna. Here's the thing - would it be OK to put the samples of chalk in white vinegar (acetic acid)? If it is, I've just got some questions -- Should I dilute the vinegar? And if so, by how much? How long should I leave the chalk in the vinegar? Any suggestions and ideas would be much appreciated, I'd love to find some little fish and shark teeth. Christian
I'm a new member, so thanks for accepting me. My family and I have hunted for fossils, arrow heads, and sharks teeth for many years. It has been a way to pass the time on hunting leases and on the beach. It has always been a hobby, we have never worried about identification of any particular piece...until recently. Being retired, I started going through our collection, just for the heck of it. I found this piece that we have always been curious about. It was found in a creek bed on a ranch near Sonora, Texas, in northern Schleicher County. It was found 6-7 years ago, we leased the property for deer hunting for four years. With all that said, I posted pictures of it on a FB group. It has been called a "cone in cone" structure, an unknown type fossil, and a man made fake. The post on FB has been entertaining to say the least. One person responding recommended this group so here I am. I am in the Houston area so I would be willing to take it somewhere for a better look. Thanks in advance for any help you can offer.