Definition of graptolite in English:

graptolite

noun ˈɡraptəlʌɪtˈɡraptəˌlīt

A fossil marine invertebrate animal of the Palaeozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs.
Class Graptolithina, phylum Hemichordata
Example sentencesExamples
- In addition, the first planktonic graptolites evolved, though some species of graptolites became extinct.
- To return to our example, the usual biostratigraphic markers in Middle Paleozoic stratigraphy are graptolites, conodont ‘jaw’ parts, and thelodont scales.
- The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates).
- Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks.
- The boundary between the Cambrian and the Ordovician is marked by the appearance of planktic dictyonemid graptolites.

Origin

Mid 19th century: from Greek graptos 'marked with letters' + -lite: so named because of the impressions left on hard shales, resembling markings with a slate pencil.

Definition of graptolite in US English:

graptolite

nounˈɡraptəˌlīt

An extinct marine invertebrate animal of the Paleozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs.
Class Graptolithina, phylum Hemichordata
Example sentencesExamples
- The boundary between the Cambrian and the Ordovician is marked by the appearance of planktic dictyonemid graptolites.
- In addition, the first planktonic graptolites evolved, though some species of graptolites became extinct.
- Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks.
- To return to our example, the usual biostratigraphic markers in Middle Paleozoic stratigraphy are graptolites, conodont ‘jaw’ parts, and thelodont scales.
- The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates).

Origin

Mid 19th century: from Greek graptos ‘marked with letters’ + -lite: so named because of the impressions left on hard shales, resembling markings with a slate pencil.

单词	graptolite
释义	Definition of graptolite in English: graptolite noun ˈɡraptəlʌɪtˈɡraptəˌlīt A fossil marine invertebrate animal of the Palaeozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs. Class Graptolithina, phylum Hemichordata Example sentencesExamples In addition, the first planktonic graptolites evolved, though some species of graptolites became extinct. To return to our example, the usual biostratigraphic markers in Middle Paleozoic stratigraphy are graptolites, conodont ‘jaw’ parts, and thelodont scales. The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks. The boundary between the Cambrian and the Ordovician is marked by the appearance of planktic dictyonemid graptolites. Origin Mid 19th century: from Greek graptos 'marked with letters' + -lite: so named because of the impressions left on hard shales, resembling markings with a slate pencil. Definition of graptolite in US English: graptolite nounˈɡraptəˌlīt An extinct marine invertebrate animal of the Paleozoic era, forming mainly planktonic colonies and believed to be related to the pterobranchs. Class Graptolithina, phylum Hemichordata Example sentencesExamples The boundary between the Cambrian and the Ordovician is marked by the appearance of planktic dictyonemid graptolites. In addition, the first planktonic graptolites evolved, though some species of graptolites became extinct. Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks. To return to our example, the usual biostratigraphic markers in Middle Paleozoic stratigraphy are graptolites, conodont ‘jaw’ parts, and thelodont scales. The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). Origin Mid 19th century: from Greek graptos ‘marked with letters’ + -lite: so named because of the impressions left on hard shales, resembling markings with a slate pencil.
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