Noun
golden spike (plural golden spikes)
(geology) A geologic marker created by a global event that leads to long lasting global changes recorded in the geologic record that can be used to indicate a change in a geologic time division such as an epoch, age, era.
The women's one-hour race involves a fascinating struggle between two of the world's outstanding athletes as Hassan and Kosgei attack the mark of 18,517km set by Ethiopia's Dire Tune at the Ostrava Golden Spike meeting in 2008. Source: Internet