The Slave Craton is divided into a west-central basement complex, the Central Slave Basement Complex, and an eastern province, named the Hackett River Terrane or the Eastern Slave Province.
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The geology of the city consists of two principal types of rocks of an ancient Basement Complex, a result of a process that took place during the late Pre-Cambrian period about 500 million years ago.
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After the award of their PhDs, they both joined the staff at Imperial College . that had a major impact on the study of Precambrian basement complexes, by showing that it was possible to understand their dykes, known as the Scourie dykes.