Graptolite meaning

grăptə-līt
Any of numerous extinct colonial marine animals chiefly of the orders Dendroidea and Graptoloidea of the late Cambrian to the early Mississippian Periods, whose fossil remains are often used to date the rocks of the Silurian and Ordovician ages.
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Any of numerous hemichordates of the class Graptolithina. Graptolites form colonies consisting of interlocked cuplike chambers arranged in one or more branches and covered by an exoskeleton. They flourished from the late Cambrian to the early Mississippian Period, and were thought to be extinct until 1992 when scientists discovered what is believed to be a living species. Graptolites are important index fossils used to date the rocks of the Silurian and Ordovician Periods.
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Any of a group of extinct aquatic colonial invertebrates, of the class Graptolithina, from the Cambrian and Carboniferous periods.
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Origin of graptolite

  • Greek graptos written (from graphein to write graphic) –lite (from the resemblance of the fossils' impressions on shale to markings on a slate)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek γραπτός (graptos, “painted, marked with letters") +"Ž -lite.

    From Wiktionary