| 单词 | sertularian |
| 例句 | About six species of Graptolite, a peculiar group of sertularian fossils before alluded to as being confined to Silurian rocks, occur in this shale. The Student's Elements of Geology This fossil, referred, though somewhat doubtfully, to a form of hydrozoid or sertularian polyp, has not yet been met with in strata above the Silurian. The Student's Elements of Geology |
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