About the Authors

Hannah Louise Hilbert-Wolf

hannah.hilbertwolf@my.jcu.edu.au

Affiliation Department of Earth and Oceans, James Cook University, Townsville, Queensland, Australia

Eric M. Roberts

Affiliation Department of Earth and Oceans, James Cook University, Townsville, Queensland, Australia

Competing Interests

Heritage Oil Rukwa Tanzania Ltd. provided logistical support (e.g., access to a vehicle) and advice while we were conducting research in the area, where they are also concurrently conducting hydrocarbon exploration reconnaissance work. The authors' interaction with Heritage Oil Rukwa Tanzania Ltd. geologists does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: HLHW EMR. Performed the experiments: HLHW EMR. Analyzed the data: HLHW EMR. Contributed reagents/materials/analysis tools: HLHW EMR. Wrote the paper: HLHW EMR.