Cambria is the old name for Wales (UK) where the first skeletalized animal fossils were found. The first period in the Palaeozoic era marked by the occurrence of many forms of invertebrate life (540-500 Mya). The sudden appearance of the major animal phyla in the fossil record during the Cambrian period is called Cambrian explosion.

The earliest period of the Paleozoic era, from 570 to 500 million years ago. View timeline of geologic events.

The geological period from about 570 million years to 510 million years ago. The start of the Cambrian is characterised by a stupendous burst in life - or at least its preservation in the geological record.

the period of geological time that began about 570 million years ago and ended about 470 million years ago.

The oldest system of rocks containing the first shelled fossil remains. Its history spans 70 million years beginning 530 ± 40 million years ago.

A period of geological time, dating from about 545 to 490 million years ago.

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.

The earliest period of the Paleozoic, thought to have covered the span of time between 543 and 490 million years ago, also, the corresponding system of rocks. It is named after Cambria, the Roman name for Wales, where rocks of this age were first studied.

Period of geologic time 500-570 million years ago.

A Geological epoch from 600 to 500 million years ago.

the youngest paleozoic time period (590-505 million years ago). Saw first vertebrates (jawless fish).

from 544 million to about 500 million years ago; marine invertebrates

a native or resident of Wales

of or relating to or characteristic of Wales or its people or their language; "the Welsh coast"; "Welsh syntax"

The earliest period of the Palaeozoic era to which systems of rock may be assigned.

The earliest period of the Paleozoic era, thought to have covered the span of time between 570 and 500 million years ago; also, the corresponding system of rocks.

Unit of rocks identified by Adam Sedgwick and named Cambria, the ancient name for Wales, where he first studied the rocks. Lowermost unit in the Paleozoic.

the first epoch of the Palaeozioc era which lasted 100 million years, during which marine invertebrates, such as trilobites, first appeared; from Medieval Latin Cambria 'Wales', where outcrops of these rocks occur.

From 500 million to 600 million years ago; marine invertebrates.

The earliest period of the Paleozoic era, spanning the time between 544 and 505 million years ago. It is named after Cambria, the Roman name for Wales, where rocks of this age were first studied.

Pertaining to or appearing in the period from 570 million to 500 million years ago.

Geologic period that begins the Paleozoic Era 570 million years ago. Marked in its beginning by a proliferation of animals with hard, preservable parts, such as brachiopods, trilobites, and archaeocyathids. PICTURE

(see Geological Timescale)

The earliest defined geological period spanning 550-510Ma. Time before the Cambrian is referred to as the Pre-Cambrian, making the Cambrian the first period of the Paleozoic Era. All fossils are marine from this period and the beginning of this period saw... More

The oldest of the systems into which the Paleozoic stratified rocks are divided.

The first of the six Geologic Periods of the Paleozoic Era. It extends from the end of the Precambrian Era (about 570 million years ago) to the beginning of the Ordovician Period (about 500 million years ago).

the period of geological time between 544 and 505 million years ago. The name comes from the Cambrian Mountains in Wales, where the strata of the Cambrian were first defined. See Geological Timescale.

Early Paleozoic period ranging from 540 Ma to 500 Ma.

The first period of the Paleozoic Era, during which most modern animal phyla developed. The name derives from Medieval Latin Cambria "Wales".

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.

Geologic period that occurred from 570 to 505 million years ago. During this period, invertebrates become common in the oceans and the Burgess Shale was formed.

The period following the Pre-Cambrian, where most marine invertebrates evolved 545 million years ago. Most organisms before this period were not preserved in the fossil record.

The earliest defined geological period spanning 542-483Ma. Time before the Cambrian is referred to as the Pre-Cambrian, making the Cambrian the first period of the Palaeozoic Era. All fossils from this period are marine and the beginning of this period saw the Cambrian Explosion; an apparent burst of evolution. The Cambrian is split into four Epochs, Lower Series, Series 2, Series 3 and Furongian.

The Cambrian is a major division of the geologic timescale that begins about 542 ± 1.0 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 ± 1.7 Ma with the beginning of the Ordovician period (ICS, 2004). It is the first period of the Paleozoic era of the Phanerozoic eon.