>>2012371
The planet's environment matters. Once you know what to look for you can single out the most likely candidates.
eg, for stratum tectonicas:
High metal content planets only
Temp: 62-447K, preferred 165-200K
Gravity: Max 0.61g, preferred 0.3-0.4g
Pressure: Any, preferred below 0.02atm
Atmo: Any, but only Ammonia, CO2 and SO2 have significant numbers