Building stones and boulders used for decorative landscaping are always a welcomed site to the eyes of a geologist, especially when it is different than the predominant rock type of the region.  In an area dominated by schist, these cross-bedded sandstones are a nice teaching tool to show students another rock type.  However, it is also important to share with students that these non-local rocks came from a sandstone quarry owned by Russell Stone Products in central Pennsylvania, and were brought down to southeastern Pennsylvania.