Fossil forest reveals sunspot activity in the early Permian

@article{Luthardt2017FossilFR,
  title={Fossil forest reveals sunspot activity in the early Permian},
  author={Ludwig Luthardt and R. Roessler},
  journal={Geology},
  year={2017},
  volume={45},
  pages={279-282}
}
Modern-day periodic climate pattern variations related to solar activity are well known. High-resolution records such as varves, ice cores, and tree-ring sequences are commonly used for reconstructing climatic variations in the younger geological history. For the first time we apply dendrochronological methods to Paleozoic trees in order to recognize annual variations. Large woody tree trunks from the early Permian Fossil Forest of Chemnitz, southeast Germany, show a regular cyclicity in tree… 

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