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Jens Esmark
/ref> was a Danish-Norwegian professor of mineralogy who contributed to many of the initial discoveries and conceptual analyses of glaciers, specifically the concept that glaciers had covered larger areas in the past. Jens Esmark (Store norske leksikon)
In 1798, Esmark was the first person to ascend Snøhetta, highest in the mountain range Dovrefjell in southern Norway. The same year he led the first expedition to Bitihorn, a small mountain in the southernmost outskirts of Jotunheimen, Norway. In 1810 he was the first person to ascend the mountain Gaustatoppen in Telemark, Norway.
Professor Esmark theorized in 1824 that glaciers had once been larger and thicker and had covered much of Norway and the adjacent sea floor. He also attributed Glacial erratic and moraines to glacial transportation and deposition. He first recognized glaciers as a powerful agent of erosion that had carved the Norwegian fjords.
Professor Esmark was also an important figure in the history and cultural heritage of mineralogy. He introduced norite the name for which was derived from the Norwegian name for Norway, Norge.
On the island of Løvøya, Norway, his son, Hans Morten Thrane Esmark, found the first specimens of a black mineral, thorite, from which the element thorium is derived. His son also provided him with a new mineral which he found in Arendal, Norway. In 1806 he named datolite, from the Greek word meaning "to divide". This was a reference to the granular structure of the first specimens studied.
In 1825, Professor Esmark was elected a member of the Royal Swedish Academy of Sciences. In 1832, he was Knighted in the Swedish Order of Vasa.
ISSN 0300-9483. Open access.
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