Esper Signius Larsen Jr., known as Esper S. Larsen Jr., was an American geologist and petrologist born March 14, 1879, in Astoria, Oregon, who died March 8, 1961, in Berkeley, California, and who developed techniques for age estimation using the lead-uranium ratio, known as the Larsen method, and conducted petrological study of non-opaque minerals using optical microscopy techniques; with Harry Berman he co-authored The Microscopic Determination of the Nonopaque Minerals in 1934, described as a major landmark in mineralogy. He served as a geologist with the United States Geological Survey from 1909 to 1923 and again after 1949, held a professorship of petrology at Harvard University from 1923 to 1949, and conducted research at the Carnegie Institution in Washington. The mineral esperite, originally named calcium larsenite before being renamed in 1965, honors him, and this wave grounds his 1953 Penrose Medal in the Geological Society of America own recipient roster.
Facts
Notable WorkThe Microscopic Determination of the Nonopaque Minerals (1934, with Harry Berman) 1 In the Other Atlases
Sources
1. Esper Signius Larsen, Wikipedia
Infobox, birth_date parameter
| birth_date = {{birth date|1879|03|14}}
Category list, 1879 births
[[Category:1879 births]]
Education and career section, first sentence
Larsen was born in [[Astoria, Oregon]] to Danish immigrant Esper Signius Sr. and Louisa Pauly from Akron.
Infobox, death_date parameter
| death_date = {{death_date_and_age|1961|03|08 |1879|03|14}}
Category list, 1961 deaths
[[Category:1961 deaths]]
Infobox, death_place parameter
| death_place = [[Berkeley, California]], USA
Lead section, first sentence
was an American geologist and petrologist who contributed to techniques for age estimation using the
Lead section, second sentence
He served as a professor of petrology at [[Harvard University]] from 1923 to 1949.
Research section, second paragraph sentence
''The Microscopic Determination of the Nonopaque Minerals'' (1934) was a major landmark in mineralogy.
Infobox, Born field
Born (1879-03-14)March 14, 1879 Astoria, Oregon, USA
Infobox, Born field, year component
Born (1879-03-14)March 14, 1879 Astoria, Oregon, USA
Infobox, Born field, place component
Born (1879-03-14)March 14, 1879 Astoria, Oregon, USA
Infobox, Died field
Died March 8, 1961(1961-03-08) (aged 81) Berkeley, California, USA
Infobox, Died field, year component
Died March 8, 1961(1961-03-08) (aged 81) Berkeley, California, USA
Infobox, Died field, place component
Died March 8, 1961(1961-03-08) (aged 81) Berkeley, California, USA
Lead paragraph, opening sentence, nationality clause
Esper Signius Larsen, Jr. (14 March 1879 - 8 March 1961) was an American geologist and petrologist
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