• (n.) One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids.
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http://thinkexist.com/dictionary/meaning/graptolite/
any member of an extinct group of small, aquatic colonial animals that first became apparent during the Cambrian Period (540 to 505 million years ... [7 related articles]
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http://www.britannica.com/eb/a-z/g/60
Graptolites were a group of extinct marine colonial animals, most of which lived attached to the sea bed. Graptolites lived from the Cambrian period (roughly 540 to 505 million years ago) to the early to mid-Carboniferous (360 to 320 million years ago). These small sea animals had a soft body, tentacles, and a hard outer chitonous covering (similar...
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Grap'to·lite noun [ NL, Graptolithus, from Greek ... is engraved, written (
gra`fein to write) + ... stone.]
(Paleon.) One of numerous species of slender and delicate fossils, of the genus
Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group...
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http://www.encyclo.co.uk/webster/G/52
a stick-like group of colonial, marine animals which lived from the middle Cambrian to the Lower Carboniferous. They are very important for defining the stratigraphy of Ordovician and Silurian rocks in the U.K
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