geologyin-blog:Polished limestone from Marston Magna, U.K. with a calcite vein which runs across the
geologyin-blog:Polished limestone from Marston Magna, U.K. with a calcite vein which runs across the fossil. This piece shows many cross-sections of ammonites (Promicroceras marsdonensis). Jurassic period, approximately 200 million years old.Amazing Geologist -- source link
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