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The fact that transitional species have been found at all is remarkable, and it offers further support of gradual, evolutionary change.

persists into the Pliocene (Wadi Natrun, Egypt; Garaet Ichkeul; Ain Brimba) but apparently disappears before the end of this period, and is absent from north Africa until the middle Pleistocene (Ain Mefta).

However, two hypotheses regarding speciation also exist.

Moving to rocks that are about 550 million years old, fossils of simple, multicellular animals can be found.

At 500 million years ago, ancient fish without jawbones surface; and at 400 million years ago, fish with jaws are found.

Fossils are traces of organisms that lived in the past.

When fossils are found, they are analyzed to determine the age of the fossil.


  1. Jul 7, 2017. The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record. One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating. Also called absolute dating.

  2. Abstract. The primitive cercopithecidProhylobates is known only from the middle? Orleanian sites of Moghara Egypt and Zelten Libya. No cercopithecid is known from north Africa during the Astaracian and Vallesian periods. Macaca or a closely allied form appears in the late? Turolian of Sahabi Libya and Menacer.

  3. Dating the Time of Origin of Major Clades Molecular Clocks and the Fossil Record. Annual Review of Earth and Planetary Sciences. Vol. -88 Volume publication date May 2002 https//doi.org/10.1146/annurev.earth.30.091201.140057. Andrew B. Smith1 and Kevin J. Peterson2. 1Department of Palaeontology, The.

  4. Mass extinctions were first identified by the obvious traces they left in the fossil record. The Cretaceous-Tertiary boundary, as recorded in the rocks at Gubbio, Italy. Figuring out exactly how much real time passed during a mass extinction is difficult and requires the use of state-of-the-art radioisotopic dating techniques.

  5. Though the fossil record does not include every plant and animal that ever lived, it provides substantial evidence for the common descent of life via evolution. The fossil. Scientists found a species of cynodonts, dating to just before the emergence of mammals, that had a double jaw hinge like that of a mammal. A pair of.

  6. Other important points in interpreting the fossil record Dating fossils requires radiometric dating of associated igneous rock. sedimentary rock is of highly mixed origin. Moreover, fossils and the bed in which they lay have been reworked and redeposited. Careful stratigraphy and analyses of surrounding strata must be done.

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