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graptolite
This term is used almost exclusively within the specialized fields of paleontology and stratigraphy. It carries a neutral, scientific connotation and is typically employed in technical descriptions of Paleozoic rock formations to establish the age of a geological layer.
Because these organisms are frequently used as index fossils, the word often appears in the context of biostratigraphy, where the presence of specific species allows geologists to correlate the ages of rock strata across different geographic regions.