Unscrambling time in the fossil record

Article Abstract:

Scientists have used a combination of two dating techniques to produce a record of a land-snail's 15,000-year-long campaign to invade and hybridize the native snail species on Great Inagua in the Bahamas. A single bed of snail shells provided the fossil record of the evolutionary shift.

Gastropoda, Fossil, Fossil gastropods

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Did Darwin get it all right?

Article Abstract:

Paleontologists have completed a study on the fossil remains that disputes the theory that a species changes gradually over a long period of time before a new species evolves. The study on bryosoa provides strong support for punctuated equilibrium in speciation.

Origin of species, Species, Species (Biology), Bryozoa, Ectoprocts

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Does evolutionary history take million-year breaks?

Article Abstract:

Some paleontologists have proposed a concept called coordinated stasis in which entire communities of marine animals stop evolving for millions of years. Results of fossil studies on the concept are mixed.

Fossils, Paleontology, Marine fauna, Marine animals

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