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Dave Carlson replied to the topic Mold, Cast and Steinkern in the forum What Is It? 7 years, 3 months ago
7 years, 3 months ago7 years, 3 months agoHello Jack (@jkallmeyer),
Out here we get cephalopod fossils in the Ordovician strata that have no shell material but retain the internal structure of the siphuncle. The entire mass of the fossil is solid (seems like a steinkern) but the fill matrix can be separated from the siphuncle, even though they look essentially the same. This suggests a…[Read more]
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