Rick:Thanks for posting a response to my query.I have bumped into your Casner line as I have been researching my line.A few years ago I made a mad dash to IA in my endeavors.But as luck would have it, found nothing further on my Ebenezer and Benjamin. I keep track of all Casner families as I come across them (helps me to keep from going back over the same information again and again).
I am confident that your Elza Casner is not a part of my line.The reason being by the time your Elza Casner was born my Casners had all left IA.Unless of course Ebenezer and Benjamin remained behind and I just can't find them alive anywhere.My Casner line came out of MO to IA; before MO the ancestors had been in KY/TN; before KY/TN they had been in PA.
Some of my Casners left IA (Marion Co.) in 1849 (a grown son and an underage son went to CA); then in 1852 the widowed mother with the remaining seven children (assuming Ebenezer and BEnjamin were dead by this time)migrated to OR; the last son turned back in 1852 and settled in KS, but in 1862 he then migrated to OR with his family.
Sure wish I could help you.Any Casner line is very difficult to trace because the spelling of the name keeps morphing.If your line was like mine, they were illiterate and their name got written down any and every way.