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Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.
Since then, geologists have made many tens of thousands of radiometric age determinations, and they have refined the earlier estimates.Other critics, perhaps more familiar with the data, question certain aspects of the quality of the fossil record and of its dating.These skeptics do not provide scientific evidence for their views.Early geologists, in the 1700s and 1800s, noticed how fossils seemed to occur in sequences: certain assemblages of fossils were always found below other assemblages. Since 1859, paleontologists, or fossil experts, have searched the world for fossils.In the past 150 years they have not found any fossils that Darwin would not have expected.
Between a uranium source and an electroscope detector, he placed first one thickness of aluminum foil, then two, and so on up to 13.