Diachronously

Using the literature of human and medical genetics, the results of a synchronous citation study of obsolescence over a 19-year period were compared with the results of a diachronous citation study. If the first two years of synchronous data are excluded, the rate of obsolescence measured synchronously is statistically equivalent to the rate of obsolescence measured diachronously.

The Pyrenees represents an orogen that developed diachronously, from east to west, between the Late Cretaceous and Miocene.

We propose that multiple Great Unconformities developed diachronously and represent regional tectonic features rather than a synchronous global phenomenon.