I too am only able to get as far back as Adrestus Clark in my research. I have found his grave listing. He is buried in Blossom Cemetery in Hamlin, NY. Buried near him is who I believe is his father- William E. Clark (1803) http://mcnygenealogy.com/cem/blossom.htm
I found William E. Clark living with his wife Sally and other children on the 1850 census in Clarkson, Monroe, New York. Other children are (Alanzo, Emma, Eliza, Matthew and Joseph).
Here is the link:https://familysearch.org/pal:/MM9.1.1/MCB9-W5M