Pipeline Meadows Group Number 4 (PMG-4) Geyser is located across the firehole river from the lodge cabins in the Upper Geyser Basin of Yellowstone. In June of 2003 PMG-4 had a 12 hour plus interval between initials and then erupted in series.
PMG-4 Geyser June 2003:
PMG-4 movie (7.7 Mb, 44 sec, sound)
Image copyright 2003, Michael Frazier. All rights reserved.