Stephen Jay Gould on Dinosaurs and Evolution

http://www.pangeaprogress.com/1/post/2010/09/evolution-is-a-tree-not-a-straight-ladder-to-humans.html

Just as Galileo discovered that the Earth is not the center of a human centered Universe, Darwin's tree showed that Humans are not the center nor the end of the Animal Kingdom.

"We talk about the 'march from monad to man' (old-style language again) as though evolution followed continuous pathways to progress along unbroken lineages. Nothing could be further from reality. I do not deny that, through time, the most 'advanced' organism has tended to increase in complexity. But the sequence [allocated in most texts] from jellyfish to trilobite to nautiloid to armored fish to dinosaur to monkey to human is no lineage at all, but a chronological set of termini on unrelated evolutionary trunks. Moreover life shows no trend to complexity in the usual sense — only an asymmetrical expansion of diversity around a starting point constrained to be simple."
Stephen Jay Gould

H. sapiens is but a tiny, late-arising twig on life's enormously arborescent bush — a small bud that would almost surely not appear a second time if we could replant the bush from seed and let it grow again."
"History includes too much chaos, or extremely sensitive dependence on minute and unmeasurable differences in initial conditions, leading to massively divergent outcomes based on tiny and unknowable disparities in starting points. And history includes too much contingency, or shaping of present results by long chains of unpredictable antecedent states, rather than immediate determination by timeless laws of nature. Homo sapiens did not appear on the earth, just a geologic second ago, because evolutionary theory predicts such an outcome based on themes of progress and increasing neural complexity. Humans arose, rather, as a fortuitous and contingent outcome of thousands of linked events, any one of which could have occurred differently and sent history on an alternative pathway that would not have led to consciousness."
Stephen Jay Gould

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