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Showing results for tags 'aptychi'.
Hi everybody. I stumbled upon those photos on another forum and i wondered about what are they, and about how and "who" made those alignaments of aptychi. They've been found in Valanginian marls, Saynoceras verrucosum zone. Concerning what and how, the authors of that article Double alignments of ammonoid aptychi from the Lower Cretaceous of Southeast France proposed several hypothesis : a possible bottom current ; regurgitalites of an ammonoid eater ; stomachal residues ; cololites. But their best hypothesis is cylindrical coprolites that separated in two parts just after the animal defe
bugsheep posted a topic in Questions & AnswersI have a few questions I’m unable to answer about ammonites. I’ve been doing some casual research, but it seems to lead to more confusion on this. I would really appreciate it if anyone could suggest more sites to look at as well. What kind of shell “decoration” is present on ammonites with ammonitic sutures? Was there any “normal” combination of shell and suture mark, or could their shells have any pattern of ridges, knobs, etc.? I’ve been hoping to find a sort of before and after polishing photo/sketch set, showing what shell went with what suture pattern, but have been unable to find an