| molecular clocks and geological dates: cytochrome b of anolis extremus substantially contradicts dating of barbados emergence. | even though molecular clocks vary in rate to some extent, they are widely used and very important in a range of evolutionary studies, not least in interpreting cause and colonization in phylogeography. evolutionists may use island age and emergence to give the earliest possible date for colonization by a species and hence give the lower limit in a molecular clock calibration. the geology of the lesser antilles is well studied and barbados, although composed of some ancient rocks, is thought to h ... | 2005 | 15910329 |