Then in the Cambrian era, around 570 million years ago, recognizably complex animal life evolved, including vertebrate ancestors.
No remains of plants have been found in Cambrian strata, except some doubtful markings, as of seaweed.
But the Cambrian had stout friends to put in the witness-box.
Any attempt to picture the geographical conditions of the Cambrian period must of necessity be very imperfect.
But it is not only in length that the Cambrian has developed in recent years.
No definite conclusions can be drawn from the fossils as to the climatic peculiarities of the earth in Cambrian times.
A variant of the preceding story appears in the Cambrian Magazine, vol.
But of the Cambrian as we know it to-day there will be something more to be said presently.
Upon the whole, the Cambrian work is superior to the Spanish.
The first book printed in the English language, actually written by a Cambrian then living?
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." Geological sense (of rocks first studied in Wales and Cumberland) is from 1836.
The first period of the Paleozoic Era, from about 540 to 505 million years ago. During this time warm seas and desert land areas were widespread, and animal life diversified rapidly during what is known as the Cambrian Explosion. See Chart at geologic time.