Re: look up help?
The US Gen Web site for Putnam County has a search engine and frames. Joshua is on a marriage record, but the link is to the main page. You'll have to go there:
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and repeat my search. Use quotation marks in the search window.
05 Apr 1853
So, unless they were living in sin for 12 years beforehand, like Brad Pitt and whats-her-name, Louisa was a step daughter.
has some older Dennys:
Mary, w/o Joseph Denny d 22 Apr 1882 age 90 6m 7d
Joseph Denny d 22 Jan 1873 age 84y 7m 2d
I thought it might be him, but this Joseph is on the 1860 also, and your Joshua was b ~ 1804.
Not exactly what you asked for. Hope it helps, though.