Just a quick correction on my earlier statement that the first time a Stowell connected with a Quayle was the aforementioned occurrence - there was also a Jane Stole who married and Charles Quayle in 1694 according to the IGI but obviously their children would have been Quayles.
If you get back beyond where you're stuck the contact me Brian as I have a fairly large Stowell tree going back to the early 1600s.
Cheers,
Pat