Buzzard3
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- Jan 31, 2022
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The cambrian explosion kinda vanishes? Really? The following quotes suggest otherwise:You guys still using cambrian period as if our understanding of it and the pre cambrian hasn't expanded to where the so called explosion kinda vanishes.
"[A] great variety and abundance of animal fossils appear in deposits dating from a geologically brief interval between about 530 to 520 Ma, early in the Cambrian period. During this time, nearly all the major living animal groups (phyla) that have skeletons first appeared as fossils (at least one appeared earlier) ...
This geologically ABRUPT and spectacular record of early animal life is called the Cambrian explosion." (Douglas Erwin and James Valentine, "The Cambrian Explosion", p. 5. emphasis added)
“The most conspicuous event in metazoan evolution was the dramatic origin of major new structures and body plans documented by the Cambrian explosion. Until 530 million years ago, multicellular animals consisted primarily of simple, soft-bodied forms, most of which have been identified from the fossil record as cnidarians and sponges. Then, WITHIN LESS THAN 10 MILLION YEARS, almost all of the advanced phyla appeared, including echinoderms, chordates, annelids, brachiopods, molluscs and a host of arthropods. The extreme speed of anatomical change and adaptive radiation during THIS BRIEF TIME PERIOD REQUIRES EXPLANATIONS THAT GO BEYOND THOSE PROPOSED FOR THE EVOLUTION OF SPECIES WITHIN THE MODERN BIOTA.” (Robert L. Carroll, “Towards a new evolutionary synthesis,” Trends in Ecology and Evolution, Vol. 15: 27-32 (January, 2000 , emphasis added.)
"An analysis by MIT geochronologist Samuel Bowring has shown that the main pulse of Cambrian morphological innovation occurred in a sedimentary sequence spanning NO MORE THAN 6 MILLION YEARS. Yet during this time representatives of AT LEAST SIXTEEN COMPLETELY NOVEL PHYLA AND ABOUT THIRTY CLASSES first appeared in the rock record. In a more recent paper using a slightly different dating scheme, Douglas Erwin and colleagues similarly show that THIRTEEN NEW PHYLA APPEAR IN A ROUGHLY appear in a roughly 6-MILLION-YEAR WINDOW."
(Stephen Meyer, "Darwin's Doubt", p. 73. emphasis added)
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