Pennock Landforms can be processed from a DEM using ArcInfo Macro Language (AML) codes pennock97.aml and simplelfabc.aml. Up to 11 different landforms may be extracted.

Refs:
Hengle & Reuter (2009) Chapter 11: Geomorphometry in ESRI Packages, p. 269-291 (AML codes)
http://www.geomorphometry.org/content/landform-classes-pennock-and-corre-2001
Pennock et al. (1987) Geoderma 40
Pennock et al. (1994) Geoderma 64