Stone used for building can be found in virtually any city or town, sometimes in a great many varieties. Urban field trips focusing on building stone have become quite popular in recent years. The concept of the urban field trip is now well established. These should be used with some kind of backing such as clipboards. Alternatively, students in higher grades can use notebooks for recording observations.
Crayons work well for younger students.
Samples of rocks, minerals, and fossils. It is helpful to recruit extra adults to help with street crossing, logistics, passing out worksheets, etc. For younger students it is necessary to have a high ratio of adults to students. Magnifying glasses or hand lenses, and rulers may be needed in some cases. In order to develop a successful unit utilizing building stone one should have a background in geology.