Do visit Samuel Greele's Find A Grave Memorial, where photographers have shared wonderful photographs of not only his stone, but a monument with a notation by the photographer that "This marker is at the spot where he died when a tree fell on him and his horse."
In addition, his gravestone notes his cause of death as well.
|Source: Find A Grave photographer Cindy Schultz|
who was suddenly killed
by the fall of a tree, on
the 25th of Sep. 1798 in
the 46th year of his age.