From the website: http://www.menallenfriends.org
In 1691, William Penn (a member of the Religious Society of Friends) founded a government and a society that welcomed all people and all religions. This tolerance attracted immigrants of varied religions and backgrounds, including many Quakers. By the 1730’s some of these families moved to York and Adams Counties in Pennsylvania. The percentage of Friends (Quakers)was significant. To support these new communities new Quaker Meetings were established, notably, Newberry (Redlands) Meeting in 1739, Warrington in 1745, Menallen Meeting in 1748 and Huntington Meeting in 1750.
At the time that Jacob and Elizabeth's children were born, Menallen was a preparatory meeting:
to hold regular meetings and for several years to come all members of Menallen Meeting were members of Sadsbury Monthly Meeting. However, upon establishment of Warrington Monthly Meeting in 1747, all Friends west of the Susquehanna River became members of the new Monthly Meeting. There is a description of where the original and also the newer meeting houses were built at this same site.
And from: http://thegenproject.com/quakers/meeting-info/baltimore-yearly/warrington-quarterly/menallen-monthly
Menallen Preparative was set up as in 1748 by Sadsbury Monthly, having been an Indulged Meeting since 1733. In 1748, the meeting became part of Warrington Monthly Meeting, the registers of which show that the first marriage to be conducted at Menallen in 1751. Menallen's earliest meeting house was a log structure, which they tore down in 1838, and rebuilt on a new property in Flora Dale, about a mile south of Bendersville. About 1890, that structure was replaced by the red brick building currently in use.
Records of Menallen Monthly Meeting, 1733-1993. Includes men's and joint minutes 1780-1963, women's minutes 1780-1891, vital records 1733-1991, Ministers and Elders minutes 1884-1911, and miscellaneous 1851-1993. So it does not look as if there would be more information available during the time that Jacob and Elizabeth were in PA. By 1763 they had moved to North Carolina. Which brings me to the reason that I had assumed that they were from Warrington MM.
1763, 11, 26. Jacob (Ellott) & W& ch, Jacob, Elizabeth, Hannah, Israel & William rocf Warrington MM, Pa, dated 1763, 9, 20 (I have a copy of the original MM records for this) This is found in the records of New Garden MM in what is now Guilford County, NC. It would have been Rowan County in 1763
They would have taken a certificate from Warrington MM because at the time Menallen was not yet a MM. It was still just a preparative meeting.