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Jeff Nolder commented on their own Fossil #022704 6 years, 11 months ago
6 years, 11 months ago6 years, 11 months agoArchaeocyathids (“ancient cups”) are considered an early order of poriferans. Once known as “Nidulites pyriformis”, they formed massive bioherms in early Cambrian carbonate shelves. By the mid-Cambrian they were largely extinct, outcompeted by other sponge forms.