Used in historical and paleontological contexts to discuss ancient Earth history.

Historical Term

Marks the era when diverse life forms rapidly emerged, a pivotal event in evolution.

Evolutionary Milestone

Refers to a specific time period in Earth's history, requires understanding of geological time.

Geological Timeframe

Refers to the geological period, useful in discussions about Earth's ancient past.

Period Reference

Associated with the rocks and sediment from the Cambrian; relevant in geology and paleontology.

Geological Formations

Commonly found in academic texts; not used in casual conversation.

Academic Term

 least life on planet Earth following the first horrible microbial age in the Cambrian explosion life emerged from the swamps complexity arose and from what we can tell we're halfway through we have as much time for animals to exist on