| 释义 |
Definition of graptolite in English: graptolitenoun 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: graptolitenounˈɡraptəˌlīt 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. |