I have a Milk Chocolate Dinosaur Egg, studded with mini chocolate dinosaurs and ammonites.

我有的是牛奶巧克力恐龙蛋，上面点缀着迷你巧克力恐龙和鹦鹉螺化石。

All the ammonites vanished, but their cousins the nautiloids, who lived similar lifestyles, swam on.

菊石统统消失了，但它们的表亲鹦鹉螺目软体动物却存活下来，尽管它们有着相似的生活方式。

This is a fossilized ammonite, and it's at least tens of millions of years old, and it's still iridescent.

这是一个菊石化石，它至少有几千万年的历史了，而且它仍然是彩虹色的。

Specifically a Mamites Ammonite from the Cretaceous Age.

一只白垩纪的马密特斯菊石。

The morphology of ammonite shells is almost identical.

菊石壳的形态几乎相同。

Often, they'd find the remains of shellfish-like animals like ammonites and bullet-shaped belemnites.

通常，他们会发现菊石和子弹形箭石等贝类动物的遗骸。

Unlike dinosaur bones or ammonite shells the  squishier worms did not fossilize easily.

与恐龙骨头或菊石壳不同，较软的蠕虫不容易形成化石。

It spelled the end to 300 million years of ammonite evolution.

这标志着菊石3亿年演化的终结。

But in the Devonian, a new branch of the cephalopod family tree appeared: ammonites.

但在泥盆纪，出现了头足类 家族树的一个新分支：菊石。

At first, he thought it was an ammonite -- one of the ancient relatives of today's nautilus.

起初，他以为那是菊石——今天的鹦鹉螺的远古亲戚之一。