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

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

Brooke is based at the University of Oxford, researching phosphorous cycling in the Mesoproterozoic Roper Group, Australia, using traditional petrography and modern micro-analytical techniques.

Jessica Von Der Meden

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 and redox during the emergence of skeletal life.


Mapaseka Mashego

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.

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