I am the person in the photo. Unfortunately, I am awful for a scale due to perspective.
This is a roadcut and it clearly shows trough cross-stratification, perhaps from a stream. The structures that clues us in are the abundance of smiley faces. These are created as subaqueous dunes migrate and their troughs cuts off previously deposited dune peaks.
Streams have these kinds of structures at the thalweg or just above it. The thalweg is the deepest, and often the fastest, part of a stream. I
If you click on the photo, you should notice that the grain sizes are pretty apparent. They are medium to coarse, though I lean towards coarse. That would be an additional line of evidence that this was deposited by a stream.
I cannot say for certain which direction this stream flowed. From this perspective it is either in or out of the photograph. But I would hazard to guess water flows in to the photograph since the troughs seem to be dipping that way.
In summary, this is a cut-and-fill structure which represents the bottom of a stream! Cool!