The first geological Period of the Palaeozoic Era (ranging from 570 to 510 million years ago) It contains the oldest fossils of organisms with mineralised skeletons
The Cambrian is a geological period that began about 570 Ma ago and ended 505Ma ago During this period many marine animal groups radiated quickly Named after the Roman name for an ancient Welsh tribe
Paleontological/geological 100 million-year period that began about 600 million years ago It was characterized by an explosive growth of marine life, principally the invertebrates
A rugged upland plateau extending north to south through central Wales. the Cambrian Mountains a group of mountains that go from north to south through the middle of Wales
Oldest time division of the Paleozoic Era. During the Cambrian, 543-490 million years ago, there were widespread seas and several scattered landmasses. The largest continent was Gondwana. The average climate was probably warmer than today, with less variation between regions. There were no land plants or animals, but there were marine organisms with either shells or skeletons. Because the dominant animals were trilobites, the Cambrian is sometimes referred to as the Age of Trilobites