1. Geology & Geological Engineering Department, Colorado School of Mines, 1516 Illinois Street, Golden, Colorado 80403, USA
2. Senckenberg Biodiversity and Climate Research Centre, Georg-Voigt-Straße 14-16, 60325 Frankfurt am Main, Germany
3. Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
4. Department of Geological Sciences, Stanford University, 450 Serra Mall, Building 320, Stanford, California 94305, USA