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Petrified Fossils Molds and Casts Carbon Films Preserved Remains Trace Fossils. - ppt download
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Fossil Types, Characteristics & Examples | What is the Study of Fossils? - Video & Lesson Transcript | Study.com
![I recently bought this ammonite cast fossil, and I noticed that it has some grey patches (you can see a couple of grey streaks at the top). Is it possible that these I recently bought this ammonite cast fossil, and I noticed that it has some grey patches (you can see a couple of grey streaks at the top). Is it possible that these](https://preview.redd.it/52lv3oe85ej31.jpg?width=640&crop=smart&auto=webp&s=f19b7bdad4aa4cdf5fc3cfdbad4914702b8330e3)
I recently bought this ammonite cast fossil, and I noticed that it has some grey patches (you can see a couple of grey streaks at the top). Is it possible that these
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