See my follow-up to Janetta below. In addition to the Turner Conant's, I recall reading that other descendents of Roger settled in Maine, some before Benjamin arrived in Turner. They were altogether different branches of the family. One branch settled in the Alfred/Sanford area.
Most of the stuff I've found does not give much info about the branch I'm in, but gives quite a bit about other branches. I'm descended from Roger's son Lot (b. 1624) and grandson Nathaniel (b. 1650). There seems to more info on descendents of other sons of Roger and other sons of Lot. Nathaniel's descendents are the least publicised in the materials I've been able to find.