The "Cambrian explosion" was a relatively brief time in geologic history (about 535–525 million years ago) when large, hard-bodied animal forms with most of today's known body plans appeared.
La "Cambrian explosion" fue un breve período en la historia geológica (hace unos 535-525 millones de años) donde aparecieron formas animales grandes y de cuerpo duro con la mayoría de los planes corporales conocidos hoy.
| Front | Cambrian explosion |
|---|---|
| Back | A relatively brief time in geologic history when large, hard-bodied forms of animals with most of the major body plans known today appeared in the fossil record. This burst of evolutionary change occurred about 535–525 million years ago. |
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