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We use SEDz* -- a code designed to chart star formation histories (SFHs) of6<z<12 galaxies -- to analyze the SEDs of 894 galaxies with deep JWST/NIRCamimaging by JADES in the GOODS-S field. We show how SEDz* matches observed SEDsusing stellar-population templates, graphing the contribution of eachepoch-by-epoch to confirm the robustness of the technique. Very good SED fitsfor most SFHs demonstrates the compatibility of the templates with stars in thefirst galaxies -- as expected, because their light is primarily frommain-sequence A-stars, free of post-main-sequence complexity and insensitive toheavy-element compositions. We confirm earlier results from Dressler(2023): (1)Four types of star formation histories: SFH1 -- burst; SFH2 -- stochastic; SFH3-- `contiguous' (3-epochs); and SFH4 -- `continuous' (4-6 epochs); (2)Starbursts -- both single and multiple -- are predominate (~70%) in thiscritical period of cosmic history, although longer SFHs (0.5-1.0 Gyr)contribute one-third of the accumulated stellar mass. These 894 SFHs contributelog M/Msun = 11.14, 11.09, 11.00, and 10.60 for SFH1-4, respectively, adding upto 4x10^11 Msun by z=6 for this field. We suggest that the absence of risingSFHs could be explained as an intense dust-enshrouded phase of star formationlasting tens of Myr that preceded each of the SFHs we measure. We find nostrong dependencies of SFH type with the large-scale environment, however, thediscovery of a compact group of 30 galaxies, 11 of which had first starformation at z=11-12, suggests that long SFHs could dominate in rare, denseenvironments.

Building the First Galaxies -- Chapter 2. Starbursts Dominate The Star Formation Histories of 6 < z <12 Galaxies