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AW: Frosty Times for Dinosaurs: Major Fall in Temperature 137 Million Years Ago

Any good hypotheses as to what caused this? Seems to have been one of these 
short (some Ma) sharp (up to 5K-ish) spikes, like the K-Pg, the PETM or the _H. 

Volcanism? Bolide? (Methane release would force warming)



> Journal Reference:
> 1.G. D. Price, E. V. Nunn. Valanginian isotope variation
> in
> glendonites and belemnites from Arctic Svalbard: Transient
> glacial
> temperatures during the Cretaceous greenhouse. Geology,
> 2010; 38 (3):
> 251 DOI: 10.1130/G30593.1