The Raukumara region of New Zealand corresponds to the East Cape of the North Island, and associated mountain ranges.
All basement rocks beneath the Raukumara region belong to the Torlesse Composite (Waioeka) Terrane, of late Jurassic to early Cretaceous age (150-100 Ma).
In Early Miocene times (24-21 Ma), when the Raukumara region was still adjacent to Northland, a series of thrust sheets was emplaced over much of the East Cape area.
Large portions of the Cretaceous to Oligocene rocks have been displaced by tens to hundreds of kilometres, forming what is known as the East Cape Allochthon.
The original rocks are of Cretaceous to Oligocene age (100-24 Ma), and include mudstones, limestone and basalt lava.
In the north, from Cape Runaway to Tokata, are allochthonous basaltic rocks, believed to represent sea floor, that has been obducted onto the land.
During Miocene and Pliocene times, sandstone, mudstone, and some limestone was deposited over much of the southern area of the Raukumara region.