William Carter arrived with his wife and daughter on the Prince Regent in August 1824. Other passengers on the Prince Regent included John Stephen, Solicitor-General of NSW and family, Gregory Blaxland Esq., Alexander McLeod Esq., N. Lawson Esq., Mr & Mrs. Carlisle, Mr. Mrs. and Miss Ward, Mr. H. Stuckey and Mrs. H. Slade - all from England. 
William Carter was appointed Master of the Supreme Court on 25 August 1824 . He was granted 2030 acres near Merton on 8 November 1824 . This land was later acquired by the Bettington brothers.
The land shown as Palmer on the map above was also a grant to William Carter. William Carter came into financial difficulties and the estate was put up for auction. George Thomas Palmer acquired the estate at this time:
Advertisement - Sydney Herald in 1834 - A most superior Estate known by the name of Baraba, formerly the property of William Carter, Esq., distant from the Green Hills by a bush road, only sixteen miles and by the main road twenty five miles from Maitland and nearly adjoining Elalang, the Estate of Robert Crawford Esq., This Farm comprises One Thousand Two Hundred and Eighty Acres of rich soil, admirably adapted to Agricultural and Dairy purposes. The improvements are most extensive - consisting of an excellent verandah House of six commodious rooms, four of them twenty one feet in length with under ground cellar, detached offices. A most substantial barn with mill house adjoining about one hundred feet in length with flagged cellar underneath, intended for the salting of provisions. A stable with loose box, sufficient to accommodate ten horses. A good dairy of two rooms. A tobacco house also of two rooms. Upwards of one hundred acres are cleared and burned off; a considerable proportion of which has been under cultivation, and the fencing comprises a large part of the Estate. The Timber on the land is well suited for building purposes, and very fine Cedar may be cut in the neighbourhood. 
Convicts assigned to William Carter at Barraba in 1828 included -
Patrick Collins arrived per Norfolk in 1825
John Lynch arrived per Brampton in 1823
GEORGE THOMAS PALMER
George Thomas Palmer was born in 1808, the son of George Palmer and Catherine Pemberton, and grandson of Commissary John Palmer who arrived in New South Wales with the First Fleet in 1788 as purser of Governor Arthur Phillip's flagship Sirius. .
NOTES AND LINKS
Barraba - wash drawing - Ellalong - State Library of NSW Grevilles 1872 - Family Joint
(1) Index to map of the country bordering upon the River Hunter... by Henry Dangar (London : Joseph Cross, 1828). p19 - Trove
(2) Sydney Herald 13 January 1834
(3) Sydney Gazette 12 August 1824
(4) Ancestry.com. New South Wales, Australia, Colonial Secretary's Papers, 1788-1825 Series: (NRS 898) Special bundles, 1794-1825 Item: 4/424 Page: 260