Just visited the genealogy.com Pruden web site and saw your message today[Sunday 10 August].
I do not have specific information on where your Nathaniel J. Pruden is in the family.
First Pruden in Virginia is generally accepted to be Nathaniel Pruden, died 10 Dec 1774.And all Virginia Prudens are related to him.
I can show you the location of Aaron Pruden's farm[and his son John Vernon Pruden] on the Chuckatuck River at Chuckatuck, VA.Have cleared their supposed graves site but there are no stones to mark the graves.Something in the ground there but didn't try to dig 'em up.So we will never know for sure.
Send me a message direct and I will send you more info.Have lot of info. on Pruden's in Virginia.