A xeno team takes time to decipher the language of the ruins. It also seems to take longer the larger the ruins are. You can't see the size of the ruins in the colony screen yet, you can see the size if you look at the F9 system screen. The sizes are linear with destroyed being the smallest and intact the largest size. Within that the settlement size is fairly obvious. An outpost is smaller than a colony, then a settlement, then a city. A intact outpost will have more facilities to recover than a destroyed settlement.
Hope that helps
Brian