Lieutenant-General Lieutenant general (Lt Gen, LTG and similar) is a three-star military rank (NATO code OF-8) used in many countries. The rank traces its origins to the Middle Ages, where the title of lieutenant general was held by the second-in-command on the ...

Charles Alexander McMahon FRS FGS (23 March 1830 – 21 February 1904) was an Anglo-Irish soldier,

geologist A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape them. Geologists usually study geology, earth science, or geophysics, althou ...

, and administrator in

British India The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one ...

.Obituary of Lieut. General Charles Alexander McMahon
''

Geological Magazine The ''Geological Magazine'' is a peer-reviewed scientific journal established in 1864, covering the earth sciences. It publishes original scientific research papers on geological topics. The journal is published bimonthly by Cambridge University ...

'', Vol. 1, Issue 5, May 1904, pp. 237-239, journals.Cambridge.org, accessed 4 September 2022

Early life and family

Born at

Highgate Highgate ( ) is a suburban area of north London at the northeastern corner of Hampstead Heath, north-northwest of Charing Cross. Highgate is one of the most expensive London suburbs in which to live. It has two active conservation organisati ...

, McMahon was the son of

Captain Captain is a title, an appellative for the commanding officer of a military unit; the supreme leader of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police department, election precinct, e ...

Alexander McMahon (born 1791), an officer of the

East India Company The East India Company (EIC) was an English, and later British, joint-stock company founded in 1600 and dissolved in 1874. It was formed to trade in the Indian Ocean region, initially with the East Indies (the Indian subcontinent and Southea ...

, originally of

Kilrea Kilrea ( , ) is a village, townland and civil parish in County Londonderry, Northern Ireland. It gets its name from the ancient church that was located near to where the current Church of Ireland is located on Church Street looking over the tow ...

County Londonderry County Londonderry ( Ulster-Scots: ''Coontie Lunnonderrie''), also known as County Derry ( ga, Contae Dhoire), is one of the six counties of Northern Ireland, one of the thirty two counties of Ireland and one of the nine counties of Ulster. B ...

. by his wife Aim, a daughter of Major Patrick Mansell, a British army officer. His grandfather, Arthur McMahon, was a

Presbyterian Presbyterianism is a part of the Reformed tradition within Protestantism that broke from the Roman Catholic Church in Scotland by John Knox, who was a priest at St. Giles Cathedral (Church of Scotland). Presbyterian churches derive their nam ...

minister at Kilrea and a prominent

Irish Republican Irish republicanism ( ga, poblachtánachas Éireannach) is the political movement for the unity and independence of Ireland under a republic. Irish republicans view British rule in any part of Ireland as inherently illegitimate. The develop ...

, a leading member of the

Society of United Irishmen The Society of United Irishmen was a sworn association in the Kingdom of Ireland formed in the wake of the French Revolution to secure "an equal representation of all the people" in a national government. Despairing of constitutional reform, ...

and one of their

colonel Colonel (abbreviated as Col., Col or COL) is a senior military officer rank used in many countries. It is also used in some police forces and paramilitary organizations. In the 17th, 18th and 19th centuries, a colonel was typically in charge of ...

s during the

Irish Rebellion of 1798 The Irish Rebellion of 1798 ( ga, Éirí Amach 1798; Ulster-Scots: ''The Hurries'') was a major uprising against British rule in Ireland. The main organising force was the Society of United Irishmen, a republican revolutionary group influence ...

. He fought at

Saintfield Saintfield () is a village and civil parish in County Down, Northern Ireland. It is about halfway between Belfast and Downpatrick on the A7 road. It had a population of 3,381 in the 2011 Census, made up mostly of commuters working in both south a ...

and

Ballynahinch Ballynahinch may refer to: Northern Ireland * Ballynahinch, County Armagh, a townland *Ballynahinch, County Down, a town Republic of Ireland *Ballynahinch (barony), in County Galway *Ballynahinch, County Galway, a townland in County Galway * Bally ...

and fled to

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 ...

, where he served in

Napoleon Napoleon Bonaparte ; it, Napoleone Bonaparte, ; co, Napulione Buonaparte. (born Napoleone Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French military commander and political leader who ...

’s

Irish Legion The Irish Legion (french: Légion irlandaise) was a light infantry regiment in service of the French Imperial Army established in 1803 for an anticipated invasion of Ireland. It was later expanded to a four battalions and a depot, the legion won ...

and died fighting on the French side at Waterloo. In 1881, McMahon’s father was an elderly inmate of the Royal India Asylum at

Hanwell Hanwell () is a town in the London Borough of Ealing, in the historic County of Middlesex, England. It is about 1.5 miles west of Ealing Broadway and had a population of 28,768 as of 2011. It is the westernmost location of the London post t ...

Career

After training at the

Addiscombe Military Seminary The East India Company Military Seminary was a British military academy at Addiscombe, Surrey, in what is now the London Borough of Croydon. It opened in 1809 and closed in 1861. Its purpose was to train young officers to serve in the East India ...

, McMahon was commissioned into the

Madras Army The Madras Army was the army of the Presidency of Madras, one of the three presidencies of British India within the British Empire. The presidency armies, like the presidencies themselves, belonged to the East India Company until the Government ...

and served for eight years in the 39th Regiment, Madras Native Infantry, and for thirty years was a member of the Punjab Commission. He was appointed as

Commissioner A commissioner (commonly abbreviated as Comm'r) is, in principle, a member of a commission or an individual who has been given a commission (official charge or authority to do something). In practice, the title of commissioner has evolved to in ...

Lahore Lahore ( ; pnb, ; ur, ) is the second most populous city in Pakistan after Karachi and 26th most populous city in the world, with a population of over 13 million. It is the capital of the province of Punjab where it is the largest city. ...

and Hissar in the Punjab Province. While at Hissar in 1871, McMahon began to work on geology, and in 1877 published his first important paper, in Volume X of the ''Records'' of the

Geological Survey of India The Geological Survey of India (GSI) is a scientific agency of India. It was founded in 1851, as a Government of India organization under the Ministry of Mines, one of the oldest of such organisations in the world and the second oldest survey ...

, dealing with a group of crystalline rocks. In 1879, while on leave in England, with the rank of lieutenant-colonel, he enrolled as a student at the

Royal School of Mines The Royal School of Mines comprises the departments of Earth Science and Engineering, and Materials at Imperial College London. The Centre for Advanced Structural Ceramics and parts of the London Centre for Nanotechnology and Department of Bioe ...

. Back in India he continued to investigate its geology, contributing twenty-one papers to the ''Records''. In 1885 he retired with the rank of colonel, but received further promotions, to major-general in 1888 and to

in 1892. Settling in London, he took up

petrology Petrology () is the branch of geology that studies rocks and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology. Igneous and metamorphic petrology are commonly taught together ...

, publishing papers which took the total number of his contributions to geology to nearly fifty. He was president of the

Geologists' Association The Geologists' Association, founded in 1858, is a British organisation with charitable status for those concerned with the study of geology. It publishes the ''Proceedings of the Geologists' Association'' and jointly with the Geological Society ...

from 1894 to 1896.Obituary: Lieut.-General Charles Alexander McMahon, F.R.S., F.G.S. Born March 23, 1830. Died February 21, 1904, The Geological Magazine, New Series, Decade V., Vol. I, Jan.–Dec. 1904, London: Messrs. Dulau & Co.
pp 237–239
/ref> In 1899 he was awarded the

Lyell Medal The Lyell Medal is a prestigious annual scientific medal given by the Geological Society of London, equal in status to the Murchison Medal. This medal is awarded based on one Earth Scientist's exceptional contribution of research to the scientific ...

by the

Geological Society of London The Geological Society of London, known commonly as the Geological Society, is a learned society based in the United Kingdom. It is the oldest national geological society in the world and the largest in Europe with more than 12,000 Fellows. Fe ...

. McMahon died in February 1904, aged 73, and an obituary in the ''

'' described him as an excellent geologist and petrologist and a prominent member of the Geological Society of London, noting that he had had no early scientific training. He was the father of

Henry McMahon Sir Arthur Henry McMahon (28 November 1862 – 29 December 1949) was a British Indian Army officer and diplomat who served as the High Commissioner in Egypt from 1915 to 1917. He was also an administrator in British India and served twice as ...

(born 1862), who followed his father into a career in India."McMahon, Arthur Henry, b. Nov. 28, 1862, son of Lieut.-Col. McMahon, 6, Regent's Park, Heavitree, Exeter" in Lionel Sumner Milford, ''Haileybury Register, 1862-1891'' (Haileybury College, 1891), p. 149

Honours

McMahon was elected as a

Fellow of the Royal Society of London for Improving Natural Knowledge Fellowship of the Royal Society (FRS, ForMemRS and HonFRS) is an award granted by the judges of the Royal Society of London to individuals who have made a "substantial contribution to the improvement of natural science, natural knowledge, incl ...

, a Fellow of the Geological Society of London, and a Fellow of the

University of Lahore The University of Lahore ( ur, ), abbreviated as UOL, is a private university located in Lahore, Punjab, Pakistan. It was founded at collegiate level in 1999 under the IBADAT Educational Trust and was granted full degree awarding status in 2002. ...

Notes

{{DEFAULTSORT:McMahon, Charles Alexander 1830 births 1904 deaths British geologists Madras Native Infantry