I guess that normally, rivers only erode during daylight hours. But for particularly scenic gorges (and time and a half pay), they put in some extra effort.

Headline AP: Rivers Worked Overtime to Cut Grand Gorges

WASHINGTON – The Potomac and Susquehanna rivers worked double-time to create gorges that remain scenic wonders today, carving through bedrock at twice the usual rate.

How in the world does a river work “double-time”? Do most rivers only flow 12 hours a day, and these ran for 24 hours a day? Or does it mean they had twice the volume of water in the same time? But then they aren’t working double time; they’re working twice as hard in the same amount of time.

What a silly way to say that the rivers eroded the rock faster than normally expected.