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| 1 | +# Contributing maps to Macrostrat |
| 2 | + |
| 3 | +## Polygon data fields |
| 4 | + |
| 5 | +### Mandatory fields |
| 6 | + |
| 7 | +- `name`: The name of the feature. This could be the name of a geologic unit, formation, or a more general unit name. If |
| 8 | + no formal name exists, a descriptive name may be used, such as the lithology type. (e.g., "Navajo Sandstone", "Dakota |
| 9 | + Formation", "Upper Member of |
| 10 | + the Morrison Formation", "Unknown Granite", "Alluvium", "Fluvial terrace 1A", "Water"). |
| 11 | +- `age`: A human-readable description of the age of the feature (e.g., "Cretaceous", "Late Jurassic", "201-145 Ma", " |
| 12 | + probably Late Miocene", "Kimmeridgian–Tithonian(?)"). |
| 13 | +- `descrip`: A text description for the unit, typically what would be rendered in a map legend. |
| 14 | +- `lith`: A comma-separated list of lithologies present in the unit (e.g., "sandstone, shale, conglomerate"). |
| 15 | +- `b_interval`: The formal base interval of the unit (Macrostrat `interval_id`) |
| 16 | +- `t_interval`: The formal top interval of the unit (Macrostrat `interval_id`) |
| 17 | + |
| 18 | +### Commonly used fields |
| 19 | + |
| 20 | +- `orig_id`: A unique identifier for the polygon within the source dataset. |
| 21 | +- `comments`: Additional comments about the individual polygon or containing unit |
| 22 | +- `strat_name`: The formal stratigraphic name, or comma-separated list of names, for the unit |
| 23 | + |
| 24 | +### Seldomly used fields |
| 25 | + |
| 26 | +- `t_age`: The numeric top age of the unit (in Ma) if known |
| 27 | +- `b_age`: The numeric base age of the unit (in Ma) if known |
| 28 | + |
| 29 | +### Not added yet |
| 30 | + |
| 31 | +- `color`: A hex or RGB color code for the unit |
| 32 | +- `abbrev`: An abbreviation for the unit name (e.g., "Jm" for Morrison Formation, "K" for Cretaceous, "Qal" for |
| 33 | + Quaternary alluvium) |
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