Hirnantian Glaciation

SR/SR isotopic curve for the mid-Cincinnatian (Upper Katian–Lower Hirnantian, Upper Ordovician), NE North American Shelf (Ontario, Canada) transition to the Hirnantian glaciation

structure of tropical seas during the Late Ordovician Hirnantian glaciation Lipid biomarkers record fundamental changes in the microbial community

The Late Ordovician mass extinction was linked to climate cooling and glaciation of Gondwana during the terminal Ordovician Hirnantian Age (444.7–443.4 Ma). Extinction patterns have been well described for many marine taxa, but much less is known about marine microbial communities through this interval. To elucidate the structure of microbial communities in tropical marine basins through the La...

Glaciation as a migratory switch

Migratory behavior in birds is evolutionarily plastic, but it is unclear how this behavior responded during glacial cycles. One view is that at glacial maxima, species simply shifted their breeding ranges south of glacial ice and remained migratory. To test this hypothesis, we constructed ecological niche models for breeding and wintering ranges of 56 species, finding that 70% of currently long...

Interaction between Glaciation and Climate

Contents 1 Introduction 2. The global climatic role of snow cover 3. Sea ice as a part of the global glaciation 4. The influence of snow and ice on climate 5. Thermal non-equilibrium of the nival-glacial system 6. Glaciological forecast 7. Forthcoming warming and the fate of glaciers Glossary Bibliography Biographical Sketch

Early cenozoic glaciation, antarctic weathering, and seawater

Stable and radiogenic isotopic and sedimentological data from sub-Antarctic deep sea sediment cores reveal a temporal link between changes in seawater SrrSr ratios and major episodes of late Eocene–early Oligocene climate change. The SrrSr records show two major inflections, one at 38–39 Ma near the middlerlate Eocene boundary, followed by another at 33.4 Ma. Similarly, the oxygen isotope, ice-...