graptolites

graptolites

美 　英

• n.【动】笔石
• 网络笔石类

词形变化

复数：graptolites  

英汉解释

n.

1. 【动】笔石

英英解释

n.	1. a small floating sea animal that lived in colonies between about 550 million and 325 million years ago and is now found as a fossil.

例句

The graptolites are generally preserved as films in mudstones or muddy siltstones at the depths of thousands meters beneath the surface.

这些笔石标本一般保存成薄膜状于数千米之下的泥岩或泥质粉砂岩之中。

Material illustrating detailed structure of graptolites has been etched from limestone by means of hydrofluoric acid.

表明笔石详细构造的物质是利用氢氟酸从石灰岩中侵蚀出来。

Lower Silurian graptolites from southern Anhui

安徽南部下志留统笔石