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A global perspective of soil-forming conditions during the Late Pennsylvanian: potential stochastic forcing by geosphere–biosphere carbon pools Available to Purchase
Abstract The Kasimovian was a time of ecological upheaval and large-magnitude changes in palaeoclimate. Referred to as the ‘collapse’ of the palaeotropical rainforests, the Kasimovian is marked by rapid changes in megafloral communities and associated ecosystem effects on vertebrates and invertebrates. p CO 2 variation coincided with these ecological catastrophes, varying between pre-industrial levels (PAL) to 2×PAL on 10 5 year timescales. Our understanding of the carbon cycle perturbations that affected p CO 2 and the connection of these climate-forcings to the terrestrial upheaval of palaeotropical rainforests remains a grand challenge. Here, the effects of palaeosol accumulation and/or degradation on the terrestrial carbon cycle during the Kasimovian is assessed. Palaeosols are surveyed from ice-free depositional basins on Pangaea and assessed for palaeolandscape equilibrium. An orbital framework is developed in order to understand the relationships of palaeosols, the carbon cycle, and insolation. Based on these analyses a key time interval emerges in the early Kasimovian. This time interval records a shift in palaeolandscape equilibria, terrestrial carbon cycling, and orbital forcing. The carbon cycling and landscape equilibria are eccentricity-paced; however, predominance of short eccentricity and obliquity throughout this interval indicates that the changes to palaeosols and the locus of carbon burial may have acted as a stochastic process.