The slanting tan sandstone was the bed of a river that scoured out the curved place visible here. The river later meandered away and left a marshy area or lake that was filled with dark gray mud or claystone. This cut-off is called an oxbow or buried stream channel. The river that made this channel was about the size of the Monocacy River south of Frederick.

Photo: J. J. Prats

Photo: J. J. Prats

Photo: Devry Becker Jones

Photo: J. J. Prats

Union Township, Pennsylvania · USA