Pierre Jean Édouard Desor (13 February 1811, Friedrichsdorf

Friedrichsdorf

Friedrichsdorf is a town of the Hochtaunuskreis, some north of Frankfurt am Main in Hesse, Germany.-Location: Friedrichsdorf is located in the Taunus area, ranking third among the Hochtaunuskreis boroughs after Bad Homburg vor der Höhe and Oberursel...

, Grand Duchy of Hesse

Grand Duchy of Hesse

The Grand Duchy of Hesse and by Rhine , or, between 1806 and 1816, Grand Duchy of Hesse —as it was also known after 1816—was a member state of the German Confederation from 1806, when the Landgraviate of Hesse-Darmstadt was elevated to a Grand Duchy, until 1918, when all the German...

 – 23 February 1882) was a Swiss

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 geologist

Geologist

A geologist is a scientist who studies the solid and liquid matter that constitutes the Earth as well as the processes and history that has shaped it. Geologists usually engage in studying geology. Geologists, studying more of an applied science than a theoretical one, must approach Geology using...

. He associated in his early years with Louis Agassiz

Louis Agassiz

Jean Louis Rodolphe Agassiz was a Swiss paleontologist, glaciologist, geologist and a prominent innovator in the study of the Earth's natural history. He grew up in Switzerland and became a professor of natural history at University of Neuchâtel...

, studying palaeontology and glacial

Glacier

A glacier is a large persistent body of ice that forms where the accumulation of snow exceeds its ablation over many years, often centuries. At least 0.1 km² in area and 50 m thick, but often much larger, a glacier slowly deforms and flows due to stresses induced by its weight...

 phenomena, and together with James David Forbes

James David Forbes

James David Forbes was a Scottish physicist and glaciologist who worked extensively on the conduction of heat and seismology. Forbes was a resident of Edinburgh for most of his life, educated at the University and a professor there from 1833 until he became principal of the United College of St...

 ascended the Jungfrau

Jungfrau

The Jungfrau is one of the main summits in the Bernese Alps, situated between the cantons of Valais and Bern in Switzerland...

 in 1841. He was in a guided party on the first ascent of the Lauteraarhorn

Lauteraarhorn

The Lauteraarhorn is a peak of the Aarmassif in the Bernese Alps in Switzerland. It lies close to the Schreckhorn and the Finsteraarhorn...

 on 8 August 1842.

Desor afterwards became professor of geology

Geology

Geology is the science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which it evolves. Geology gives insight into the history of the Earth, as it provides the primary evidence for plate tectonics, the evolutionary history of life, and past climates...

 at the academy of Neuchâtel, continued his studies on the structure of glaciers, but gave special attention to the study of Jurassic

Jurassic

The Jurassic is a geologic period and system that extends from about Mya to  Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...

 Echinoderm

Echinoderm

Echinoderms are a phylum of marine animals. Echinoderms are found at every ocean depth, from the intertidal zone to the abyssal zone....

s. He also investigated the old lake-habitations of Switzerland, and made important observations on the physical features of the Sahara

Sahara

The Sahara is the world's second largest desert, after Antarctica. At over , it covers most of Northern Africa, making it almost as large as Europe or the United States. The Sahara stretches from the Red Sea, including parts of the Mediterranean coasts, to the outskirts of the Atlantic Ocean...

. Having inherited considerable property he retired to Combe Varin in Val-de-Travers

Val-de-Travers

Val-de-Travers is a municipality in the district of Val-de-Travers in the canton of Neuchâtel in Switzerland. It was created on 1 January 2009, when the former municipalities of Boveresse, Buttes, Couvet, Fleurier, Les Bayards, Môtiers, Noiraigue, Saint-Sulpice and Travers merged to form...

. He died in Nice

Nice

Nice is the fifth most populous city in France, after Paris, Marseille, Lyon and Toulouse, with a population of 348,721 within its administrative limits on a land area of . The urban area of Nice extends beyond the administrative city limits with a population of more than 955,000 on an area of...

on 23 February 1882. His chief publications were: Synopsis des Echinides fossiles (1858), Aus Sahara (1865), Der Gebirgsbau der Alpen (1865), Die Pfahlbauten des Neuenburger Sees (1866), Echinologie Helvetique (2 vols., 1868–1873, with P. de Loriol).