Early Palaeozoic Icehouse

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The Early Palaeozoic Icehouse was a cool period that interrupted the greenhouse temperatures of the Ordovician and Silurian periods, 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]


  1. ^ Page, A.; Zalasiewicz, J.; Williams, M.; Popov, L. (2007). 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.  |chapter= ignored (help)
  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.