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We use deep NIRSpec spectroscopic data from the JADES survey to derive thestar formation histories (SFHs) of a sample of 200 galaxies at 0.6$<$z$<$11 andspanning stellar masses from $\rm 10^6$ to $\rm 10^{9.5}~M_\odot$. We find thatgalaxies at high-redshift, galaxies above the Main Sequence (MS) and low-massgalaxies tend to host younger stellar populations than their low-redshift,massive, and below the MS counterparts. Interestingly, the correlation betweenage, M$_*$ and SFR existed even earlier than Cosmic Noon, out to the earliestcosmic epochs. However, these trends have a large scatter. Indeed, there areexamples of young stellar populations also below the MS, indicating recent(bursty) star formation in evolved systems. We explore further the burstinessof the SFHs by using the ratio between SFR averaged over the last 10 Myr andaveraged between 10 Myr and 100 Myr before the epoch of observation($\mathrm{SFR_{cont, 10}/SFR_{cont, 90}}$). We find that high-redshift andlow-mass galaxies have particularly bursty SFHs, while more massive andlower-redshift systems evolve more steadily. We also present the discovery ofanother (mini-)quenched galaxy at z = 4.4 (in addition to the one at z=7.3reported by Looser et al. 2023), which might be only temporarily quiescent as aconsequence of the extremely bursty evolution. Finally, we also find a steadydecline of dust reddening of the stellar population approaching the earliestcosmic epochs, although some dust reddening is still observed in some of thehighest redshift and most star forming systems.

JADES: Differing assembly histories of galaxies -- Observational  evidence for bursty SFHs and (mini-)quenching in the first billion years of  the Universe