My oldest Dallas ancestor is John C. Dallas. According to his death certificate, he was born 29 February 1836 in Ohio. He died 28 January 1916 in rural (near the town of Damascus) Clackamas County, Oregon. John married twice. The first marriage was to Mary Jane Pennington and they had at least five children:

William R. born 27 November 1858 in Missouri
Aaron W. born about 1862 in Missouri
Effie Jane born 20 January 1864 in Iowa
George C. born 23 October 1869 in Iowa
Silsby S. born 26 December 1872 in Iowa

Where an exact birthdate is given, information comes from the death certificates.

By 1900, John had married his second wife, Mary (Marie?) who was from Prussia.

George C. was the one who gave the information for John's death certificate. George didn't know anything about his (George's) grandfather but stated his grandmother's maiden name was Smith. He didn't know her first name.

In 1860, the family was in Bates County, Missouri. In 1870 and 1880, they are in Appanoose County, Iowa. I suspect that they were in Gates County, Nebraska in 1885. In 1900, they are in Rawlins County, Kansas. In 1910, they were in Clackamas County, Oregon.

With the exception of some death certificates, some marriage records for John's descendants and information gleaned from census reports, that's what I know about this family.

I have yet to have the film developed but I recently went to Damascus Cemetery and took photos of what Dallas headstones I could find.