Alfred Harker was principally known for physics, but in 1884 he
was appointed university demonstrator in geology at the Sedgwick
Museum at Cambridge and was soon recognized as one
of the most outstanding figures among British petrologists.
Most of his research was conducted in north Wales and the
English Lake District. He then combined his university work
along with his fieldwork in Scotland for the Geological Survey.
His original research concerned five topics: (1) slaty cleavage,
(2) the igneous rocks associated with Ordovician sedimentary
rocks in Caernarvonshire, (3) plutonic and associated rocks in
the English Lake District, (4) the islands of the Inner Hebrides
and the studies of the Tertiary igneous activities on the Isle of
Skye and smaller islands, and (5) his general works where he
looked at philosophical results of his research and thought in
his work The Natural History of Igneous Rocks.
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