belemnite

belemnite

1. Belemnite Limestone

n. 箭石灰岩 (无,无)

2. Any of various mineral concretions,such as a belemnite,formerly supposed to be thunderbolts.

如过去被认为是雷石的箭石等各种矿物结核。

3. Any of various mineral concretions, such as a belemnite, formerly supposed to be thunderbolts.

很多矿物结核如箭石过去被认为是雷石。

4. "belemnite:a cone-shaped, fossilized internal shell of any of an extinct genus of cephalopods related to the cuttlefish."

箭石:由灭绝的与乌贼有血亲关系的头足纲动物的内壳形成的尖锥状化石。