But it was not as rapid as an explosion: the changes seems to have ... It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects these two problems.

The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones ...

Focused on Cambrian fossils, the study reanimates a species long trapped in the pages of forgotten paleontology.

33, No. 4 (May - Jun., 1925), pp. 389-407 (19 pages) This paper is chiefly (I) an outline of the geology of the territory lying along the southern border of the Canadian pre-Cambrian shield in ...

But it was not as rapid as an explosion: the changes seems to have ... It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects these two problems.