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.

1650s, "from or of Wales or the Welsh," from Cambria, variant of Cumbria, Latinized derivation of Cymry, the name of the Welsh for themselves, from Old Celtic Combroges "compatriots.&qu [..]

(540 million years ago-505 million years ago) first period in the Paleozoic era, noted for the rapid development of many different life forms.

in geologic time, a period lasting from 570m to 505m years ago.

the oldest system of rocks containing fossils; a geological period between 570 and 500 million years ago. See time table.

(n) from 544 million to about 500 million years ago; marine invertebrates(n) a native or resident of Wales(adj) of or relating to or characteristic of Wales or its people or their language

period of geological time from 545 to 495 million years ago. Marks the beginning of the Paleozic Era

A Period in the geologic time scale that spans from approximately 570 to 505 million years ago.

The earliest period of the Palaeozoic era (543-490 million years ago). It is named after Cambria, the Roman name for Wales, where rocks of this age were first studied.

(geology) Of a geologic period within the Paleozoic era; comprises lower, middle and Furongian epochs from about 542 to 490 million years ago. Of or relating to Wales.