The district boundary was drawn to include all of the contiuous parcels owned the four major cement comp^es that operated at this site during the period of significance. Discontinuous parcels were of minor importance and were not included. The boundary was determined by a combination of deed and map research as well as by on site inspection to determine the presence of historic features and their integrity. The district is generally bounded by Saw Dust Road on the north (area north of Saw Dust Road was not used in the cement industry), Tan House Brook on the west (there was no quarrying west of Tan House Brook), the Rondout Creek on the south, and Binnewater Road on the east (cement companies east of Binnewater Road were clearly separated from those to the west). See tax map for exact boundary.