Early Palaeozoic Icehouse

The Early Palaeozoic Icehouse was a cool period that interrupted the greenhouse temperatures of the Ordovician and Silurian periods, This happened in 360MA and led to culminating in the Hirnantian glaciation and the Ordovician extinction event.[1] The icehouse was formerly thought only to consist of the Hirnantian glaciation itself, but has now been recognized as a longer, more gradual event.[2]

Over an interval of 30 million years, seven glacial maxima were recorded in the sedimentary record:[3]

  1. Guttenberg Regression
  2. Early Rakvere Regression
  3. Early Ashgill Regression
  4. Hirnantian Glaciation
  5. Early Ashgill Regression
  6. Early Aeronian Glaciation
  7. Late Telychian Glaciation

References
  1. Page, A.; Zalasiewicz, J.; Williams, M.; Popov, L. (2007). "Were transgressive black shales a negative feedback modulating glacioeustasy in the Early Palaeozoic Icehouse?". In Williams, Mark; Haywood, A. M; Gregory, J; et al. (eds.). Deep-time perspectives on climate change: marrying the signal from computer models and biological proxies. Special Publication of the Geological Society of London. The Micropaleontology Society special publications. ISBN 978-1-86239-240-3.
  2. Munnecke, A.; Calner, M.; Harper, D. A. T.; Servais, T. (2010). "Ordovician and Silurian sea-water chemistry, sea level, and climate: A synopsis". Palaeogeography, Palaeoclimatology, Palaeoecology. 296 (3–4): 389–413. doi:10.1016/j.palaeo.2010.08.001.
  3. Page, A. A., Zalasiewicz, J. A., Williams, M., & Popov, L. E. (2007). Were transgressive black shales a negative feedback modulating glacioeustasy in the Early Palaeozoic Icehouse(Vol. 2, pp. 123-156). pp. 123œ156. Special Publication of the Geological Society of London, The Micropalaeontological Society.


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