If you are on the North and East facing side of the hilltop, then you will have the most soil possible, but that is a misnomer because almost all of New England has less than 10 feet to bedrock. At the top of the hill it will be pretty thin otherwise the top of the hill would have been ground down had it not been bedrock.
But on the northeast side of a hill is where you find gravel. The thinnest soil is always on the Southwest side because that is the direction the glaciers slid. When it went, it only left the bedrock behind. All that is left is the forest debris that has rotted into soil over the last 9000 years or so, so soil would be less than a foot deep. The Northeast side is a little deeper, so think of it like this. When you get a sheep turd stuck to the bottom of your
boot, you scrape it off by looking for a sharp edge; say a board on the edge of the porch. As you slide your boot forward, that sharp edge is the same thing as the bedrock on a hill. The sheep manure stays on the backside of the sharp edge, yet nothing is on the forward edge because it has all been scrapped off. That is what happened to your hill, and all hills in New England. Since the glacier/boot is moving in a southwest direction, the thicker soil/manure is on the northeast part of the hill.
Incidentally, this is why cemeteries are always on the Northeast side of a hill. They needed some depth to bedrock to bury the caskets. They also wanted easy digging, so they located them in gravel. If you have any old cemeteries near by, that is where the deepest soil is, and gravel.
But if you are looking to have an orchard, you may be in luck.
Apple trees at least, have
roots that are very shallow. If you have any depth of soil, and it is a distinct possibility being on the Northeast side of the hill, you could get away with having
apple trees (and maybe other fruit trees). I live on a hill too, and the top of my hill has only 4 inches of soil, and yet it is where my natural crab apple trees are. We had an orchard in the 1900's-2008 on pretty thin soil, and they did well.
If you are looking at a piece of land in Maine, Bedrock, Surficial and other maps are all online to see, and for free. Of these, Surficial maps are the ones you want to see because it will tell you where the soil migrated from, and to where, and how deep, and generally what it is.