Trough (geology)

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Much of the San Andreas Fault is lined by a trough. This false-colour radar image shows a section of the fault west of San Francisco Bay
Okinawa Trough, north of Ryukyu Islands
Trough cross-bedding in the Waddens Cove Formation (Pennsylvanian), Sydney Basin, Nova Scotia.

In geology, a trough refers to a linear depression that extends in one direction over a distance. It is less steep than a trench. A trough can be a narrow basin or a geologic rift. There are various oceanic troughs, troughs found under oceans; examples include the rifts along the mid-ocean ridges.