Refined Ordovician timescale reveals no link between asteroid breakup and biodiversificationOPEN ACCESS 

A. Lindskog, M. M. Costa, C.M.Ø. Rasmussen, J. N. Connelly & M. E. Eriksson

Nature Communications 8,
Article number: 14066 (2017)
Published online: 24 January 2017


“The high amount of L-type chondrites discovered in Ordovician sediments has previously been linked with the Great Ordovician Biodiversification Event. But here, Lindskog et al. present new zircon ages that date the chondrite dispersion to 468.0±0.3 Ma, showing that the two events may be unrelated.”

Representative zircon grains, illustrating external and internal characteristics. The scale bar corresponds to 100 μm. Foto: Anders Lindskog