Paleoclimatic Dynamics and Stratigraphy of Late Paleozoic Glaciation

The Late Paleozoic Ice Age, spanning roughly 360 to 260 million years ago, marks one of the most extensive glacial episodes in Earth’s history. Centre-piece to this interval was the assembly of Gondwana, whose vast southern landmass hosted ice sheets of continental dimensions. Evidence from striated pavements, diamictite sequences and grounding-zone wedges reveals cyclical advances and retreats driven by tectonic uplift, orbital forcing and atmospheric carbon dioxide fluctuations. Stratigraphically, glacial deposits are typically preserved at the base of the Dwyka Group in southern Africa and the Itararé Group in South America, where basal tills pass upward into glaciofluvial sands, marine shales and turbidites. Palynostratigraphy refines the chronology, distinguishing early Cisuralian palyno-zones from Guadalupian successions. The transition to post-glacial conditions is marked by stratigraphic shifts to black shales and carbonate facies, capturing early Permian greenhouse recovery. Geochemical proxies, including oxygen and carbon isotopes in marine carbonates, further illuminate cooling pulses and deglacial warming, while sedimentary architectures record ice-margin fluctuations on timescales of 10^4 to 10^5 years. In aggregate, this body of work provides a template to understand icehouse–greenhouse transitions, carbon cycle perturbations and their impact on biotic turnovers. Global correlations across Gondwanan basins underscore the synchrony of glacial maxima and the importance of high-latitude gateways in sea-level regulation. Modern climate models draw on these deep-time analogues to test sensitivity to greenhouse gas forcing and to anticipate the behaviour of contemporary ice sheets under rapid warming.

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Technical terms

Diamictite: A lithified, poorly sorted sedimentary rock containing a mix of clay, sand and gravel deposited directly by glacial ice or by mass-flow processes.

Grounding-zone wedge: A sediment accumulation formed at the marine margin of a grounded ice sheet, recording pauses in ice-margin retreat.

Fjord network: A system of deep, U-shaped valleys carved by glacial ice, subsequently flooded by marine waters.

Palynostratigraphy: The subdivision of rock units based on the distribution of fossil pollen and spores to establish relative ages.

Subglacial unconformity: A depositional or erosional surface formed beneath an ice sheet, often characterised by striations or deformation structures.

References

1. Progress on the palynostratigraphy of the Permian strata in Rio Grande do Sul State, Paraná Basin, Brazil. Anais da Academia Brasileira de Ciências (2005).
2. Ice‐margin fluctuation sequences and grounding zone wedges: The record of the Late Palaeozoic Ice Age in the eastern Karoo Basin (Dwyka Group, South Africa). The Depositional Record (2019).
3. Lowstand Turbidites and Delta Systems of the Itararé Group in the Vidal Ramos region (SC), southern Brazil. Brazilian Journal of Geology (2014).
4. Fjord network in Namibia: A snapshot into the dynamics of the late Paleozoic glaciation. Geology (2021).
5. Evolucin paleoambiental de la transicin glacial-postglacial en la Formacin Agua Colorada (Grupo Paganzo), Carbonfero, Sierra de Narvez, NO argentino. Andean Geology (2010).
6. The Late Palaeozoic Ice Age unconformity in southern Namibia viewed as a patchwork mosaic. The Depositional Record (2021).