A sector of units of excavation that consists of a group of closely related, usually contiguous, squares. The numbering of Areas is by capital letters, e.g., Area A, Area M, etc., and squares by Arabic numbers, Area A, Square 1. In some systems of excavation what is an Area in the above description is called a field, and instead of the smaller unit of squares already described, that unit is called an area, e.g., Field 1, Area 1.