The marking would just be a large snip, wouldn't it? And I think Palamino is just a cream dilution over red, I don't know how much that narrows it down though.
Edit: I found this online
Palomino: This color is actually the result of chestnut with a cream dilution factor. Look for a rich gold to clear-yellow body; manes and tails are generally white or pale; dark eyes.
Sample genetic recipe: Cremello X chestnut (will always produce palominos); cremello X any color; palomino X chestnut (you'll get only chestnut or palomino); palomino X any color; buckskin X any color; black X any color (if black parent has a hidden cream gene).