The rift start/end time 5 minute grids were generated using pyBacktrack's 'generate_rift_grids.py' script
(https://github.com/EarthByte/pyBacktrack/blob/b7234bb53d43df68de642dfdd3361a94d2acbd6e/misc/generate_rift_grids.py)
using the Muller et al. (2019) deforming model to find when deformation started and ended at grid locations that have
undergone extensional deformation and where total sediment thickness has been recorded (in continent crustal regions).