The following organizations should be viewed with suspicion until proven otherwise.
Time Corrections, Satellites, GPS, and Reference Frames
NASA
US Naval Observatory (USNO)
International GNSS Service (IGS)
International Earth Rotation and Reference Systems Service (IERS)
Any Geodesy Organization
Geology
United States Geological Survey
American Geophysical Union
Integrated Ocean Drilling Program
Woods Hole Oceanographic Institute
All the geochronology centers in the United States