Last weekend there was a big Evolutionary Biology conference at the University of Chicago. Among the speakers was Ron Numbers a former Seventh-Day Adventist. (Summary of his talk on Pharyngula) He mentioned something I had not known before. According to the talk the old earth creationism ideas of day/age and gap theory were the standard positions in the United States outside of Adventism until the 1960's. At the time there was a book written called The Genesis Flood which borrowed the SDA idea developed by Ellen White follower George MacReady Price - the Noah's flood was responsible for the entire geologic column. Since most of Christianity regarded Adventism as a cult, the SDA notion of a young earth wasn't widely accepted until introduced to mainstream Christianity by the non-Adventist who wrote The Genesis Flood.
Maybe this is common knowledge and I wasn't aware due to the fact that I was on the inside of the Adventist system. I just had know idea that the SDA church was the lone reservoir of special pseudo-science for so long.
On a related note there was a special Creation Sabbath sermon here on October, 24. I didn't get to stay and listen, but I was hoping the audio would get posted. Looks like maybe I'll never get to see what I missed.