Recent research indicates that when the Campanian Ignimbrite event occurred, the Neandertals were already on the way out. I'd say that the circa 40ka period would make the ideal setting for some good palaeo-fiction. You have volcanic explosions, modern humans replacing Neandertals, magnetic field reversals, and a new set of characters in the mysterious Denisovans. This stuff practically writes itself. On that topic, does anyone have any good prehistoric fiction recommendations?
Earth and Planetary Science Letters
Volumes 351–352, 15 October 2012, Pages 54–69
Dynamics of the Laschamp geomagnetic excursion from Black Sea sediments
N.R. Nowaczyk et al.
Investigated sediment cores from the southeastern Black Sea provide a high-resolution record from mid latitudes of the Laschamp geomagnetic polarity excursion. Age constraints are provided by 16 AMS 14C ages, identification of the Campanian Ignimbrite tephra (39.28±0.11 ka), and by detailed tuning of sedimentologic parameters of the Black Sea sediments to the oxygen isotope record from the Greenland NGRIP ice core. According to the derived age model, virtual geomagnetic pole (VGP) positions during the Laschamp excursion persisted in Antarctica for an estimated 440 yr, making the Laschamp excursion a short-lived event with fully reversed polarity directions. The reversed phase, centred at 41.0 ka, is associated with a significant field intensity recovery to 20% of the preceding strong field maximum at ∼50 ka. Recorded field reversals of the Laschamp excursion, lasting only an estimated ∼250 yr, are characterized by low relative paleointensities (5% relative to 50 ka). The central, fully reversed phase of the Laschamp excursion is bracketed by VGP excursions to the Sargasso Sea (∼41.9 ka) and to the Labrador Sea (∼39.6 ka). Paleomagnetic results from the Black Sea are in excellent agreement with VGP data from the French type locality which facilitates the chronological ordering of the non-superposed lavas that crop out at Laschamp–Olby. In addition, VGPs between 34 and 35 ka reach low northerly to equatorial latitudes during a clockwise loop, inferred to be the Mono lake excursion.