Definition of "chronogeny"

The probability is, that most of these orders have existed during all the organic periods of our planet; but, owing to various circumstances, especially to some being without any enduring remains, their chronogeny will long remain one of the most difficult problems in Malacology.

1850, William King, A Monograph of the Permian Fossils of England, Digitally Printed Edition, published 2015, page 201

The chronogeny of the various elements is in full accord with the structural progress along both lines of derivation; […] .

1894, Palaeontology of New-York, Volume 8, Part 2, page 322

Thus it is evident that we must use the very greatest care in the correlation of the chronogeny and the phylogeny of the echinoderms, and we must be continually on the watch for sudden and aberrant deviations and specializations in the older as well as in the most recent types.

1915, Austin Hobart Clark, A Monograph of the Existing Crinoids, U.S. Government Printing Office, page 7