This logic game is about a tour group that visits five archaeological sites discovered by Ferrara, Gallagher, or Oliphant in the eighth, ninth, or tenth century. It's from LSAT PrepTest 44, October 2004, Section 3, Questions 13-17, Logic Game 3.
This game is difficult because you're being baited to confuse sufficient and necessary conditions. If you know your conditional logic well, if you can run contrapositives in your sleep, then this game is rewarding. Otherwise, this game is rough. There is also a tricky rule/premise in there that tests whether you know what "recent" means. Watch the lesson below and learn how to solve this game quickly.
For more Logic Games explanations like this one, hop over to our Logic Games page. There, we've recorded video explanations for every Logic Game going back over a decade. All in HD, with variable playback speed, and you get to ask questions. Oh, the best part: it's completely free.