Question: When was the Australian suburb founded in the district named after Thomas Elder founded on the banks of the Strut River?

Context paragraphs:
Marion, South Australia: Marion is a suburb in the City of Marion in Adelaide around 10 km south-west of the CBD.  Founded as a rural village in 1838 on the banks of the Sturt River, Marion was found to have rich soil and the population expanded rapidly.  Colonel William Light laid out the plan for the village, as he had done with the City of Adelaide itself.

StRUT: StRUT (Students Recycling Used Technology) are three separate organizations in three states with similar roots and similar mission of providing technology education, resources, and recycling to schools and non-profit organizations in or near these states.  It was founded in Oregon in 1995 by Intel and the Northwest Regional Education Service District.  Through StRUT, companies such as Epson, Fujitsu, Nike, and Tektronix donate used computers and equipment to schools for refurbishing and reuse.  As of August 2003, StRUT has provided computers to over 135 schools and 21 educational service districts in Oregon and southwest Washington.  The program has also grown to several other states, as well as inspired similar recycling programs elsewhere.  In Arizona Intel, Motorola & APS have much to do with AzStrut's early growth.

Dawn Elder: Dawn Elder (San Francisco, California) is an American composer, pianist, impresario, music producer, and promotor best known for her efforts to fuse Middle Eastern music with contemporary rock and pop music.  In the 1980s she began working as an impresario and promoter, music producer, record executive and or representative for diverse artists.  She spent several years as the vice president of Ark 21/Mondo Melodia starting in 1999, and she has helped produce albums with Sting, Cheb Mami, Simon Shaheen Qantara, and Cheb Khaled.  After her work at Ark 21, Elder founded Dawn Elder World Media & Entertainment Enterprises, an entertainment firm based in California.

Elder Conservatorium: The Elder Conservatorium of Music, also known as "The Con", is Australia's senior academy of music and is located in the centre of Adelaide, the capital of South Australia.  It is named in honour of its benefactor, Sir Thomas Elder.  Dating in its earliest form from 1883, it has a distinguished history in the intensive professional training for musical performance, musical composition, research in all fields of music, and comprehensive music education.  The Elder Conservatorium of Music and its forerunners have been integral parts of the University of Adelaide since the early 1880s.

Electoral district of Elder: Elder is an electoral district of the House of Assembly in the Australian state of South Australia.  It is named after nineteenth-century businessman and philanthropist Thomas Elder.  Elder is a 15.7 km² urban electorate in Adelaide's south-west, taking in the suburbs of Ascot Park, Clovelly Park, Marion, Melrose Park, Mitchell Park and Park Holme, and parts of Colonel Light Gardens, Daw Park, Edwardstown, Oaklands Park, Plympton Park, South Plympton and Warradale.

Harlow: Harlow is a former Mark One New Town and local government district in the west of Essex, England.  Situated on the border with Hertfordshire, it occupies a large area of land on the south bank of the upper Stort Valley, which has been made navigable through other towns and features a canal section near its watermill.  Old Harlow is a village-size suburb founded by the early medieval age and most of its high street buildings are early Victorian and residential, mostly protected by one of the Conservation Areas in the district.  In Old Harlow is a field named Harlowbury, a de-settled monastic area which has the remains of a chapel, a scheduled ancient monument.

Myrtle Bank, South Australia: Myrtle Bank is a suburb of Adelaide, South Australia in the City of Unley.  The suburb is named after a property near the foothills built in 1842 by William Sanders (1801-1880), who arrived in South Australia in 1838.  He named the premises 'Myrtle Bank', because his friend James Gall of Trinity living in Edinburgh had a fine property of the same name.  The property passed through the hands of Capt. William Elder, brother of Sir Thomas Elder, before being purchased in 1848 by William Ferguson (1809–1892), who built on the original house and lived there with his family until he died.

Nooksack Valley School District: The Nooksack Valley School District in Whatcom County, Washington, U.S. is a school district named after the Nooksack River.  It has five schools and some 1,870 students as of 2006.  The district includes one high school, one middle school, and three elementary schools.

Hedgeley Dene Gardens: Hedgeley Dene Gardens is a public open space in the suburb of Malvern East in Melbourne, Australia.  It is one of the most popular parks in the Malvern East locality.  It is also significant as an example of public open space design that recreates the qualities of an informal, picturesque English garden or northern European landscape in an Australian suburb.  It forms part of a network of linear open spaces in Melbourne's eastern suburbs in the local government areas of the Stonnington and Boroondara, formed along drainage easements and watercourses such as Gardiners Creek.  However, Hedgeley Dene Gardens is unique due to its particular landscape character.

Noyyal River: The Noyyal River is a small river in Western Tamil Nadu, and a tributary of Kaveri River.  It rises from the Vellingiri hills in the Western Ghats in Tamil Nadu, very close to Kerala border, and flows through many villages and the cities of Coimbatore and Tirupur, finally draining into the Kaveri River at Noyyal, a village in Karur district named after the river itself.  The river's basin is 180 km long and 25 km wide and covers a total area of 3500 km2 .  Cultivated land in the basin amounts to 1800 km2 while the population density is 120 people per km² (311/mi²) in the countryside, and 1000 people per km² (2590/mi²) in the cities.  The area is known for its scanty rainfall and the development of the Noyyal River Tanks System to hold any overflow from the rains plus the water of the Northeast and Southwest monsoon season was ecologically important.  The 173 km long tributary of the Kaveri River]filled 32 tanks.  These interconnecting tanks held the water flowing from the Noyyal.

Supporting paragraphs: Electoral district of Elder Marion, South Australia
Answer: 1838