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Showing results for tags 'mold fossil'.
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Please bear with me as I am new to fossil identification. My 14 year old son recently became interested in fossils and geodes, so I am trying to encourage his interest. We found a round rock about the size of a bowling ball recently while digging to install a septic tank and he wanted to break it open to see if any crystals were inside. When he broke it open, he found some fossils, one of which I believe is called a mold fossil, images attached. The object that made the imprint appears to have had spines or thorns. Any help is appreciated! This was found in west central Missouri, SE Henry County. The imprint measures approximately 4-5 cm long. The round circle near the imprint appears to be a similar mold fossil, seen end-on. When he broke open the rock, he apparently split the mold down the middle. The pictures show both halves.
Hi, I'm a rock collector/hunter and found many of these shell imprints in limestone rocks on the beach. This one looked like a bullseye or pictogram. Is this considered a fossil? Does anyone know what type of shell and/or geological time period? Thanks!