Nubbin (landform)

In geomorphology a nubbin is a small and gentle hill consisting of a bedrock core dotted with rounded residual blocks.

[1][2] The blocks derive from disintegrated and weathered bedrock layers.

In particular it is assumed that the boulders of the nubbins are the remnants of the outer one or two exfoliation shells that weathered underground - albeit some weathering can continue to occur once the boulders are exposed on surface.

[1] Nubbins form in a similar way to castle koppies and bornhardts, and the three landforms can be seen as different expressions of the same phenomena.

Examples of localities with nubbins include the Southwestern United States, the MacDonnell Ranges in Central Australia and Namaqualand in Southern Africa.