Thanks! By following up a little on Diana Shantz, i was able to get Ancestry to reveal a source called
Ancestry.com. Lancaster, Pennsylvania, U.S., Mennonite Vital Records, 1750-2014 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
Original data: Genealogical Card File. Lancaster Mennonite Historical Society, Lancaster, Pennsylvania.
It lists 51 records related to Mennonites and Mennonite relatives with the family name Carson. Some are in Canada; also, Canada was not that far away.
I'll check them out.