Can you substantiate the claims that Hutton was not in widespread acceptance during the Civil War Era? You've submitted information about what the physicists estimated the age of the Earth to be. What about the geologists?
Even taking the lowest estimate of 10 million years, we're talking about an estimate 1600x what the YEC theories said it had to be, and still before Darwin.
The physicists and geologists had different theories, and made their estimates based on different criteria, but none of them had anything to do with Darwin, and they both substantially contradicted the YEC theories.
Maybe the phrase "this summation" was confusing. So I'll link it one more time, describing as a timeline of the changing estimates of the age of the earth, with dates, names, and links to references. Maybe that will help.