Sunspot-like and ENSO/NAO-like periodicities in lacustrinelaminated sediments of the Pliocene Villarroya Basin (La Rioja,Spain)

  title={Sunspot-like and ENSO/NAO-like periodicities in lacustrinelaminated sediments of the Pliocene Villarroya Basin (La Rioja,Spain)},
  author={Arsenio Mu{\~n}oz and Jorge Ojeda and Bel{\'e}n S{\'a}nchez-Valverde},
  journal={Journal of Paleolimnology},
This is a study of an extremely good outcrop of 1745 varves inthe Villarroya Pliocene Basin (Spain). The thicknesses of the light and darklayers, which were obtained from enlarged photograph negatives, are dealt withseparately, and three time series, of light, dark, and the sum of both layers,are performed. Periodicities of about 12, 6–7 and 2–3 years havebeen obtained. The origin of the recurrent behaviour of the sediments withthese periods could be related to natural phenomena like sunspot… 
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