(Appendix F) Petrology and ages of ash layers

Ages of ash layers (#) based on Ar/Ar dating and sedimentation rates were taken from Kutterolf et al. (2008).基于氩-氩（Ar/Ar）定年与沉积速率得到的火山灰层年龄（#），数据源自Kutterolf等人（2008）的研究。