At the corner of Beacon Street and Bishopsgate Road lies an example of sandstone.
Sandstone
The beds of the sandstone have been contorted, presumably while the sandstone was still soft and not completely solidified yet. The beds themselves appear like small waves in the rock.
Weathering
In this example there are some plants growing on it, including mosses and lichen. This is evidence of organic acids taking place, along with minor root wedging.