Rosalie Tostevin
Rosalie has a PhD in Precambrian sedimentary geochemistry from UCL, and a Master’s degree in geology from the University of Cambridge. She worked as a postdoc at the University of Otago for six months and the University of Oxford for three years. She joined the University of Cape Town as a lecturer in 2019.
PhD Students
Ansahmbom Nke
Co-supervisors: Harilaos Tsikos and Lorena Tafur
Ansa is using multiple geochemical proxies to reconstruct the distribution of redox zones in South African marine basins during the Great Oxidation Event. He is interested in the relationship between oxygen availability and the primary mineralogy of iron-bearing minerals in BIF horizons.
Brooke Johnson
Main supervisor: Nick Tosca. Co-supervisor: Stuart Robinson
Brooke is based at the University of Oxford, researching redox conditions and phosphorous cycling in the Mesoproterozoic Roper Group, Australia, using traditional petrography and modern micro-analytical techniques.
Jessica Von Der Meden
Main supervisor: Robyn Pickering. Co-supervisor: Jayne Wilkins
Jess is investigating the palaeoclimate associated with human occupation of the Kuruman Hills, Northern Cape, during the Late Pleistocene. She uses U-Th dating, trace element and stable isotope techniques on secondary carbonate deposits (tufas) to reconstruct the timing of their formation and the environment during their deposition.
Master’s Students
McDonald Mtonda
Mcdonald is analysing carbon, oxygen and strontium stable isotopes in carbonate rocks from the Neoproterozoic Nama Group, to constrain changes in weathering during the emergence of skeletal life.
Aidan Wilton
Aidan is mapping microbial ecosystems in the Nama Group, South Africa, and using high resolution geochemical analysis to decipher their formation mechanism and local redox environment.
Alumni
Mapaseka Mashego
For her Honours project, Mapaseka investigated trace elements in carbonates from the Upper Nama Group to constrain local oxygen levels in the final stages of the Ediacaran.
Matthew Brady
Matt was a Master’s student at the University of Oxford, and is now a PhD student at the University of Cambridge. He used experiments to constrain sedimentary phosphate cycling under ferruginous conditions.
Alice Ashpitel
Alice was a Master’s student at the University of Oxford. She used experiments to understand iron and carbon cycling on early Mars.
Honorary Members
Dora Tostevin
Sometimes assists in the field. Loves the outdoors. Expert on sticks and squirrels.
