- Relating to or denoting the earliest geological period of the Palaeozoic era, lasting from about 541 to 485 million years ago.
- Relating to or denoting the ancient Welsh kingdom of Cambria.
Early 19th century, from cambria, the latin name for wales, where rocks from this period were first described.
- The cambrian rocks contained the first known evidence of complex life forms.
- The cambrian explosion was a rapid diversification of life on earth during the cambrian period.
- The cambrian era saw the emergence of many new species of life, including the first multi-cellular organisms.
- The cambrian layer was a rich source of fossils, providing insight into the early evolution of life.
- The cambrian kingdom was a powerful political entity during the early middle ages, stretching from present-day Wales to northern England.