Relating to, containing, or resembling ammonites; of or pertaining to the ancient group of cephalopods.
From ammonite plus -ic (forming adjectives). This scientific adjective emerged in geology and paleontology literature to describe rocks, fossil assemblages, or characteristics of ammonites.
An 'ammonitic limestone' to a geologist is like a history book—it's not just rock containing ammonite shells, it's a snapshot of an entire ancient ocean ecosystem preserved in stone.
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