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  • Jeff Nolder commented on their own Fossil #022704 2 years, 9 months ago

    2 years, 9 months ago
    2 years, 9 months ago

    Archaeocyathids (“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.