According to certain researchers, no fossils have been discovered in any stratum older than the Cambrian (530-500 million years old).And contrary to the assumptions of the theory of evolution, these living organisms that possessed complex organs (like the eyes of trilobites) rather than simple ones emerge simultaneously .
I think both evolution and separate creation of the materials and living things can exist. It seems possible in some special situations (special temperature and/or pressure) we have a soup of simultaneous creatures (some pro-living or pro-element materials) which during the time gradually and even sometimes suddenly have been developed.
What sparked this biological bonanza isn't clear. It may be that oxygen in the atmosphere, thanks to emissions from photosynthesizing cyanobacteria and algae, were at levels needed to fuel the growth of more complex body structures and ways of living. The environment also became more hospitable, with a warming climate and rising sea levels flooding low-lying landmasses to create shallow, marine habitats ideal for spawning new life-forms.
Nevertheless, the scale of the Cambrian Explosion is likely exaggerated due to the proliferation of hard-bodied animals that fossilized much more readily than their soft-bodied precursors. These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders, and crustaceans. These toughened-up creatures represented a crucial innovation: hard bodies offering animals both a defense against enemies and a framework for supporting bigger body sizes.
Cambrian sediments found in Canada, Greenland, and China have yielded rarely fossilized soft-bodied creatures such as marine worms buried during undersea mud avalanches. Among the most surprising discoveries, announced in 1999, came from the 530-million-year-old Chengjiang fossil bed in China, where scientists found the remains of two different types of tiny, jawless fish. Representing the oldest known backboned animals with living relatives, the fossils showed that our vertebrate ancestors entered the evolutionary story some 50 million years earlier than previously thought.
In the Cambrian explosion, the conditions of the earth were different for all ages. The soup of life with the right pressure, the right temperature and the high oxygen provides conditions for faster evolution and speciation.
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