200,000,000 BC (aka 2x10^8 BC or Prehistoric) is a timeline that appears in Pegasus Prime. The period is set on an unstable island that is about to collapse and be destroyed in a short time. It is located in the S.E. Pacific Rim (latitude and longitude 10 1' 40" about 124 meters above sea level) The island was chosen because it was geologically unstable and would be destroyed in an upcoming eruption, thus destroying all evidence of the TSA's presence.