We have a way to download via the geologicaltime field. But it isn't really documented I find. It just says it can be repeated and used as a range (same as for year and other ranges), but for geological time it is in fact an equal with a comma and not a range when provided as a predicate.

E.g. a download for http://api.gbif-uat.org/v1/occurrence/download/request/?geologicaltime=Paleogene,Ediacaran&basis_of_record=OBSERVATION&country=ES&format=SIMPLE_CSV&license=CC_BY_NC_4_0&month=4&occurrence_status=present gets transformed into this download predicate

...
{
      "type": "equals",
      "key": "GEOLOGICAL_TIME",
      "value": "Paleogene,Ediacaran",
      "matchCase": false
}
...

Is it a deliberate choice to avoid the gte,lt etc terminology that we else use for ranges? Could we add an explicit example to the documentation?