The Cambrian explosion is referred to in Darwin's book, I thought everyone discussing this would be familiar with it. About 500 million years ago we had the "Cambrian explosion" which is where we first saw shells and bony creatures. Prior to that it was single celled organisms, and algae, etc. At the time of Darwin he knew this development was rapid and didn't coincide with his random mutation theory, so he hypothesized that we would find the "missing link". Some new dig would discover the "missing link". Instead what has happened is that our time frame for this explosion has narrowed from estimates of 50 million years to 15 million years.
At the time of Darwin he knew this development was rapid
Where did he say that then?
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