Maternal DNA trail

My brother submitted his DNA to National Geographic Project and now needs all info on Maternal side available. You've already helped with the following, I'm wondering if it's possible to go back even farther, I'll start with my great grandmother then back: Endrine Christophersdatter DOB 1848 in Sund, Norway. Her mother: Anne Endresdatter DOB 1812, Storeboe, Sund. Next: Gjertrud Johanesdatter DOB 1774 in Kolbensvig, Sund. Next: Guri Hermansdatter DOB unknown in Lochoen, Hordaland, Norway.