[1] Over time the weathering of these minerals by a previously formed ocean has given many of the rocks in the area a wide variety of distinctive colours.
[1] Above the solid geology there is a mixture of clay like soil (till) and sand and rock (alluvium), which made early agricultural efforts difficult and restricted drainage to the rivers and streams in the region.
The North Uplands begin roughly around Long Buckby and are at their most prominent around Cold Ashby, Naseby and Guilsborough.
To the Northwest, the uplands are interrupted by the Vale of Rugby, a flat, yet undulating area formed by the floodplain of the River Avon.
The area contains two major towns: Daventry and Banbury, as well as several other important settlements including Long Buckby, Weedon Bec, Brixworth, Crick and Woodford Halse.
The West Coast Mainline passes through the uplands via the northwestern half of the Northampton Loop, reconnecting just to the northwest of DIRFT in the Vale of Rugby.