Fan and Mortar Geysers are two geysers in the Upper Geyser Basin in Yellowstone National Park. For the past several decades, they have erupted in concert with one another and are generally talked about together. The records detailing these geysers' known eruptive history shows that they have been infrequent and irregular performers.
Can we infer the following?
Records have been kept for the Fan and Mortar Geysers in Yellowstone National Park for more than half a century
It's impossible to say