Green for archaeological type signals or old stuff, remains of a site, etc. the green circles seemed non-metallic, could even be Native American flint objects. Red circles for coins or other stuff you can detect 2 feet or less deep. Orange circle/X was getting a little bit of gold signal 3 feet or less. Hard to id so, if you have small amounts or traces of placer gold might explain it. Otherwise some old stuff was gold plated or else a cache with some gold in it.