The CER-MLRA-CRA Agroecological Hierarchy
![Hierarchy reverse pyramid. Full description below.](https://webarchive.library.unt.edu/eot2008/20090115184704im_/http://soils.usda.gov/survey/geography/images/hierarc2_20.jpg)
The hierarchy is a reverse pyramid proceeding from most general at the top to
most specific at the bottom. From top to bottom: Common Ecological Region (CER),
Major Land Resource Area (MLRA), Common Resource Area (CRA), STATSGO (General
Soil Map), SSURGO (Detailed Soil Map), Components (Soil Series), and Pedon.
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