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During a fieldwork expedition where we found hundreds of ammonites which were all donated to museums and geological surveys all the crew were allowed to keep a few for ourselves. Here is a specimen in my collection from the Cretaceous (over 70 million years old). The specimen is in excellent condition and was found in a a sandstone sedimentary rock. No treatment has been done to the fossil - this is exactly as it was found it in the field. An excellent specimen for any fossil collector. The sample weighs approximately 340 grams.