Cambrian (adjective)

1. Relating to or denoting the earliest geological period of the Palaeozoic era, lasting from about 541 to 485 million years ago.
2. Relating to or denoting the ancient Welsh kingdom of Cambria.

Origin:

Early 19th century, from cambria, the latin name for wales, where rocks from this period were first described.

Examples:

1. The cambrian rocks contained the first known evidence of complex life forms.
2. The cambrian explosion was a rapid diversification of life on earth during the cambrian period.
3. The cambrian era saw the emergence of many new species of life, including the first multi-cellular organisms.
4. The cambrian layer was a rich source of fossils, providing insight into the early evolution of life.
5. The cambrian kingdom was a powerful political entity during the early middle ages, stretching from present-day Wales to northern England.