Burgess Shale

Everyone knows Darwin for his theory of evolution but I didnt know that this shale was a source of his dilemma. It was interesting to find out that he could not explain the "explosion" of all these new species that arose during the Cambrian. The fossil records show the fossils of the animals of this explosion but does not show evidence of animals that they evolved from...they just appeared. This was the source of his dilemma because Darwin couldn't explain it. It is an interesting dilemma not only to him but to people today because how do you explain it if you cant prove the evolution.