Dating the fossil record
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They’re all lined up nice and neat from beginning to end.These fossils date from a time when the dentary and squamosal bones were beginning to take over the role of jaw hinge (hinge #2). However, a common objection is that few transitional fossils have been discovered; thus many lineages cannot be traced smoothly.This allowed the articular and quadrate bones to evolve into the second and third bones of the mammalian ear, as shown on the right. There are several reason for these gaps in the fossil record. Plus, transitional species tend to appear in small populations, where rapid changes in the environment can provide a stronger evolutionary drive.The fossil record is a remarkable gift for the study of nature. In rocks more than 1 billion years old, only fossils of single-celled organisms are found.
Moving to rocks that are about 550 million years old, fossils of simple, multicellular animals can be found.
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