More potential holes in my argument 
In context, the jarring, once depression-inducing term 'potholes' takes on a whole new meaning 
In context, the jarring, once depression-inducing term 'potholes' takes on a whole new meaning
[taken from GC20KPZ DC Rocks (Earthcache) in Maryland, United States created by ZeWrestler] As time flies other tectonic activity occurred in the world and around the Washington DC area. But the evidence of that activity has been lost to weathering of the rocks. This lack of recorded activity is called an unconformity. Instead, we see a bare eroded surface. This erosional plane is topped with river gravel and newer sedimentary deposits that are formed like conglomerate rocks. These rocks are formed much later: during the Cretaceous period, which is about 360 million years after the Taconic orogeny. Conglomerates are sedimentary rocks consisting of rounded fragments that are cemented together over time, but have not received the heat and pressure necessary to transform the sediments into solid rock.
This rock has since changed its shape due to time and the effects of the river. This is particular noticeable in the form of potholes. Potholes are formed when a river causes a vortex of water that erodes a hole into the rock. The abrasion is mainly caused by the circular motion of the small sediments that are carried by the water. These potholes indicate that where this outcrop is was once covered by the river’s surface. In the image above we see various examples of potholes showing that they come in all shapes and sizes. Here we see five different potholes in the same location.
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