High temperatures in the late Cretaceous Arctic Ocean

Article Abstract:

Arctic palaeotemperatures form the upper cretaceous deposits is determined using TEX a new palaeothermometer based on the composition of membrane lipids derived from a ubiquitous component of marine plankton, Crenarchaesta. The Arctic marine paleotemperatures are consistent with models of a CO (sub 2)-rich Cretaceous atmosphere characterized by a vigorous hydrological cycle.

Arctic, Environmental aspects, Arctic Ocean, Cretaceous period

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Cortical growth marks reveal extended juvenile development in New Zealand moa

Article Abstract:

Cortical growth marks are frequent in long bones of New Zealand moa. Moa has the exaggerated k-selected life history strategy formerly common in the New Zealand avifauna, and in some instances took almost a decade to attain skeletal maturity, which indicates that the reproductive maturity in moa was extremely delayed.

New Zealand, Observations, Stem cells, Structure, Moa, Moas

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Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event

Article Abstract:

A study of isotopic light carbon is presented with reference to its occurrence. The proposal that a release of methane from a gas hydrate during a Jurassic oceanic anoxic event is discussed.

Methane, Carbon, Letter to the Editor, Carbon isotopes, Geochemistry

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