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We’ve all heard about one of the great mysteries in paleontology: dinosaurs. They disappear from the fossil record without a trace. The disappearance of dinosaurs proved difficult for many scientists to explain until geological thinking became more comfortable with the idea of global catastrophes.To read the rest, click on "Mystery of the First Animals".
Dinosaurs get all the attention, but a different kind of mystery cloaks the other end of the fossil record: the Ediacaran.
For over a century, most people thought the lowest examples of animal life were in the Cambrian rocks because they contained the first life forms with “hard parts.” Think trilobites. Like most other people in his generation, Charles Darwin identified these rocks as the first examples of life in the fossil record. In the next hundred years or so, however, paleontologists found some strange fossils belonging to the lower Cambrian.