Xin-Shi Cheng School of Geography, Earth and Environmental SciencesPhD student Contact details AddressSchool of Geography, Earth and Environmental SciencesUniversity of Birmingham Edgbaston Birmingham B15 2TT UK Xin-Shi Cheng is a PhD candidate in Earth Sciences, supervised by Prof Jason Hilton, on a project entitled: "Seeds as proxies of seed plant evolutionary and diversity changes through profound intervals of climate and environment change."