Interesting video refuting common descent of fossils

The video talks about the Cambrian explosion.

The Cambrian explosion, or less commonly Cambrian radiation, was the relatively short evolutionary event, beginning around 542 million years ago in the Cambrian Period, during which most major animal phyla appeared, as indicated by the fossil record.  Lasting for about the next 20 million years, it resulted in the origin of the body plan of modern metazoans.  Additionally, the event was accompanied by major diversification of other organisms.  Prior to the Cambrian explosion,  most organisms were simple, composed of individual cells occasionally organized into colonies. Over the following 70 or 80 million years, the rate of diversification accelerated by an order of magnitude and the diversity of life began to resemble that of today.  Many of the present phyla appeared during this period, with the exception of Bryozoa, which made its earliest known appearance in the Lower Ordovician.

The Cambrian explosion has generated extensive scientific debate. The seemingly rapid appearance of fossils in the “Primordial Strata” was noted as early as the 1840s, and in 1859 Charles Darwin discussed it as one of the main objections that could be made against the theory of evolution by natural selection. The long-running puzzlement about the appearance of the Cambrian fauna, seemingly abruptly and from nowhere, centers on three key points: whether there really was a mass diversification of complex organisms over a relatively short period of time during the early Cambrian; what might have caused such rapid change; and what it would imply about the origin of animal life. Interpretation is difficult due to a limited supply of evidence, based mainly on an incomplete fossil record and chemical signatures remaining in Cambrian rocks.
     - Wikipedia

The argument is that if evolution is accurate, and is a long process whereby one organism slowly evolves to another species, why is there no evidence of the progression?  Why is there no progressive periods, showing gradual change?   Instead almost every phyla showed up in one period!  An explosion! 

And if evolution is true and and explosion of almost all life forms that we know now began during this 20 million year period, why have we not seen exponentially more life forms evolve during the next 520 million years?   Infact, some think there are less now than then.