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Petrified Fossils Molds and Casts Carbon Films Preserved Remains Trace Fossils. - ppt download
Geology Concepts - Cast and mold are a type of fossilization where the physical characteristics of organisms are impressed onto rocks, especially coarse porous rocks such as sandstones.The mineralized impression of the
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Make a Fossil – For Educators
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