(British) Army List - for 1850
Page 251 notes George Marmaduke REEVES as a Captain currently serving in the 99th (Lanarkshire) Regiment of Foot.
He has 24 year service on Full Pay and an additional 2 years and 3 months on Half Pay.
He was promoted Ensign on 1 July 1824, purchased his commission as Lieutenant on 8 April 1826, purchased his commission as Captain on 27 April 1827, promoted Brevet Major 23 November 1841.
The regiment embarked for Foreign Service in September 1842 and is currently serving in Van Diemen's Land.
Page 92 is part of the listing of Majors in the Army (commencing on page 86), where George is shown with a date of appointment as Major of 23 November 1842, with earlier dates of appointment matching those above.