So far there are a total of 391 excavated features in J2. More than half of these features are classified as build-up at 61% of the features, with horizontal surfaces the next highest at only 13%. See table below:
| type | total | percent | |
| build-up (accumulations, layers) | 241 | 61% | |
| amorphous amassment (fill, dumping, collapse) | 44 | 11% | |
| ordered aggregation (walls, installations) | 16 | 4% | |
| horizontal surfaces (floors, pavements) | 52 | 13% |
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