NameMariah 
Birthabout 1839
Spouses
Birth26 March 1825
Memo(find-a-grave)
Death23 September 1908
Memo(PA Death Certificates)
BurialMaple Grove, Elizabethville, Dauphin Co, PA
Birth, Parent-Proof, Designation notes for Jonas (Spouse 1)
Jonas Mertz is listed by Floyd as a son of Jacob and Sarah Jury. He is designated U1f.
Relocated and Census Tracking notes for Jonas (Spouse 1)
Jonas can be found in the 1850 Census in Upper Paxton Township. He is a tailor (his father's occupation) age 35 and lives with Caroline 25 and Susannah P 5 and Benjamin 3 and Isaiah 1. Also present, but out of order and listed after Benjamin are Catherine 11 and Henry 14. Most likely these are children of Jonas by a first wife or they could be children of, say, a deceased brother -- but I'm aware of none.
I've listed all of these children here as belonging to both Jonas and Caroline since I do not know the name of his first wife if he had one.
Then in 1870, Jonas is living with Mariah age 31 -- a third wife I assume -- and Jonathan M 17 and Clinton E 4 months.
Death and Find-a-Grave notes for Jonas (Spouse 1)
He died at the PA Lunatic Hospital according to his death certificate.