The earliest known vertebrates originated about 530 million years ago during the Cambrian explosion.
- Domain: Eukaryota > Kingdom: Animalia > Phylum: Chordata
First Vertebrates
530 Million BCE
530 to 520 Million Years Ago
That History Story,
was first published on TST 5 years ago.
All story is part of the broader TST project.
These short pieces do the quiet work of verification, helping ideas stay grounded in reliable scholarship rather than repetition, assumption, or memory alone.
The end!