So, if I understand correctly, Oliver Calk had a 2nd wife named Mary Younse? Or was that David Calk?
I just recently utilized the LDS's 1880 US Census With Index to compare their transcription of the 1880 Union Co., LA census data on the Oliver Calk family. They transcribed the "unreadable" wife's name as Martha Jane. Not to get too thrilled here, they also transcrined Oliver's last name as Cork and Solon Ransom as Solace. So, they're not infallible. They did show the 2nd boy as Bradin Ransom, which I thought it might be, also.
Anyhow, I went back to the image, armed with this interpretation, and I bellieve I can agree that the wife's name was Jane. I think the Martha part was merely a "bleed over" from an adjoining page. The entire census sheet appears to be almost like two sheets superimposed. I guess it may have been damp at one time and the ink transferred from page to adjoining page. Anyway, it does look like Jane is a good candidate.
Also, since my posting on Oliver Calk, I gave it more thought and I realize that this "Jane" and the two Ransom boys, Solan and Brudii/Bradin living with Oliver Calk are probably not Thomas P. Ransom's daughter-in-law and grandchildren. Thomas Ransom didn't marry until after the war,as far as I know (he was in the 3rd Alabama Infantry) - he wasn't married in 1860 when he was in his father's houshold in Russel Co. AL. So, for this 18 year old "Jane" to be a daughter-in-law, Thomas would have to have a son born sometime on or before 1862. He might have had some wartime marriage that I'm unaware of though. Nonetheless, "Jane" must be some close kin - maybe a brother's or nephew's widow?