Jules Marcou (April 20, 1824 – April 17, 1898) was a French-Swiss-American geologist.

Biography

He was born at Salins, in the ''

département In the administrative divisions of France, the department (french: département, ) is one of the three levels of government under the national level ("territorial collectivity, territorial collectivities"), between the regions of France, admin ...

'' of Jura, in

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

. He was educated at

Besançon Besançon (, , , ; archaic german: Bisanz; la, Vesontio) is the prefecture of the department of Doubs in the region of Bourgogne-Franche-Comté. The city is located in Eastern France, close to the Jura Mountains and the border with Switzerl ...

and at the Collège Saint Louis,

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...

. After completing his studies, he made several excursions through Switzerland to recover his health. These travels led him to devote himself to natural science. During these travels, he met

Jules Thurmann Jules Thurmann (5 November 1804, Neuf-Brisach in Haut-Rhin, France – 25 July 1855, Porrentruy) was an Alsatian French-Swiss geologist and botanist. He studied at the college in Porrentruy, then continued his education at the University of ...

(1804–1855), who introduced him to

Louis Agassiz Jean Louis Rodolphe Agassiz ( ; ) FRS (For) FRSE (May 28, 1807 – December 14, 1873) was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Spending his early life in Switzerland, he rec ...

. During 1845, he worked with Thurmann on a

geological survey A geological survey is the systematic investigation of the geology beneath a given piece of ground for the purpose of creating a geological map or model. Geological surveying employs techniques from the traditional walk-over survey, studying outc ...

of the

Jura mountains The Jura Mountains ( , , , ; french: Massif du Jura; german: Juragebirge; it, Massiccio del Giura, rm, Montagnas da Jura) are a sub-alpine mountain range a short distance north of the Western Alps and mainly demarcate a long part of the Frenc ...

. He was appointed assistant of the mineralogical department of the

Sorbonne Sorbonne may refer to: * Sorbonne (building), historic building in Paris, which housed the University of Paris and is now shared among multiple universities. *the University of Paris (c. 1150 – 1970) *one of its components or linked institution, ...

in 1846, and also classified its collection of fossils. During this time, he conducted geological investigations in various parts of Europe. In 1847 he went to

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

as traveling geologist for the '' Jardin des Plantes'', charged with studying the United States and the English possessions in North America. The next year, he joined Agassiz in

Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ...

, and accompanied him to the

Lake Superior Lake Superior in central North America is the largest freshwater lake in the world by surface areaThe Caspian Sea is the largest lake, but is saline, not freshwater. and the third-largest by volume, holding 10% of the world's surface fresh wa ...

region, visiting the copper mines of the

Keweenaw Peninsula The Keweenaw Peninsula ( , sometimes locally ) is the northernmost part of Michigan's Upper Peninsula. It projects into Lake Superior and was the site of the first copper boom in the United States, leading to its moniker of "Copper Country." As o ...

Lake Huron Lake Huron ( ) is one of the five Great Lakes of North America. Hydrology, Hydrologically, it comprises the easterly portion of Lake Michigan–Huron, having the same surface elevation as Lake Michigan, to which it is connected by the , Strait ...

, and

Niagara Niagara may refer to: Geography Niagara Falls and nearby places In both the United States and Canada *Niagara Falls, the famous waterfalls in the Niagara River *Niagara River, part of the U.S.–Canada border *Niagara Escarpment, the cliff ov ...

. After six months, he returned to

Cambridge, Massachusetts Cambridge ( ) is a city in Middlesex County, Massachusetts, United States. As part of the Boston metropolitan area, the cities population of the 2020 U.S. census was 118,403, making it the fourth most populous city in the state, behind Boston, ...

, and sent minerals he had collected to Paris. In January 1849, Marcou directed his attention to the geology of

New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

, and

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth ar ...

. Later he crossed the

Allegheny Mountains The Allegheny Mountain Range (; also spelled Alleghany or Allegany), informally the Alleghenies, is part of the vast Appalachian Mountain Range of the Eastern United States and Canada and posed a significant barrier to land travel in less devel ...

, visiting the

Mammoth Cave Mammoth Cave National Park is an American national park in west-central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world. Since the 1972 unification of Mammoth Cave with the even-longer system under F ...

and other localities, and then traversed

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

. He returned to Europe for a short time in 1850. In 1853 he published a ''Geological Map of the United States, and the British Provinces of North America''. In 1853 he was hired by the United States government to serve as a geologist for the

Pacific Railroad Survey The Pacific Railroad Surveys (1853–1855) were of a series of explorations of the American West designed to find and document possible routes for a transcontinental railroad across North America. The expeditions included surveyors, scientists, and ...

along the 35th parallel, one of a series of explorations of the American West to find possible routes for a transcontinental railroad. In this role he became the first geologist to cross the United States. He subsequently made a geological section extending from the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it f ...

to the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

. In 1855 he became professor of geology and

palaeontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ...

at the

polytechnic school Polytechnic School, often referred to simply as Poly, is a college preparatory private day school located in Pasadena, California with approximately 850 students enrolled in grades Kindergarten through 12. The school is a former member of th ...

Zürich Zürich () is the list of cities in Switzerland, largest city in Switzerland and the capital of the canton of Zürich. It is located in north-central Switzerland, at the northwestern tip of Lake Zürich. As of January 2020, the municipality has 43 ...

, but relinquished this office in 1859. His ''Lettres sur les roches du Jura et leur distribution géographique dans les deux hémisphères'' (published 1857...1860) included one of the earliest proposals that a

land bridge In biogeography, a land bridge is an isthmus or wider land connection between otherwise separate areas, over which animals and plants are able to cross and Colonisation (biology), colonize new lands. A land bridge can be created by marine regre ...

had once existed between the Old World and New World. In 1861 again returned to the United States, when he assisted

in initiating the

Museum of Comparative Zoology A museum ( ; plural museums or, rarely, musea) is a building or institution that cares for and displays a collection of artifacts and other objects of artistic, cultural, historical, or scientific importance. Many public museums make these ...

, and was in charge of its palaeontological division from 1860 to 1864. Subsequently, he devoted himself to scientific research until 1875, when he again began service for the United States government, and accompanied the

Wheeler Survey The Wheeler Survey, carried out in 1872-1879, was one of the "Four Great Surveys" conducted by the US government after the Civil War primarily to document the geology and natural resources of the American West. Supervised by First Lieutenant (lat ...

Southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural region that generally comprises the southern portion of the U.S. state of California. It includes the Los Angeles metropolitan area, the second most po ...

Personal life and death

Jules Marcou married Jane Belknap of Boston in 1850. They had two children. He died in

, in 1898 and was interred there in

Mount Auburn Cemetery Mount Auburn Cemetery is the first rural cemetery, rural, or garden, cemetery in the United States, located on the line between Cambridge, Massachusetts, Cambridge and Watertown, Massachusetts, Watertown in Middlesex County, Massachusetts, Middl ...

Publications

*
Life, letters, and works of Louis Agassiz
' (1895) * ''Cretaceous formations of the Jura'' * ''Dyas (Permian) of Nebraska'' * ''Taconic rocks of Vermont and Canada'' *
American Geological Classification and Nomenclature
' (1888) * ''Geological Map of the World'' (1861, 2nd ed. 1875) *
A Little More Light on the United States Geological Survey
' (1892) * ''Lettres sur les roches du Jura et leur distribution géographique dans les deux hémisphères'' (1857–1860) *
Geology of North America
' (1858)

References

Sources

* (fr) : Durand-Delga M., Moreau R., ''Jules Marcou (1824-1898) précurseur français de la géologie nord-américaine'', L'Harmattan, 200 pages, 2003.

Biography

Personal life and death

Publications

References

Sources

Further reading