NWIS Parameter Codes for Age Dating
Most if not all of the analyses conducted by the USGS Age Dating Lab have NWIS (National Water Information System) parameter codes and associated method codes. The downloadable spreadsheet available here provides a summary of these codes. This sheet is a work in progress. It incorporates comments and suggestions from previous users. If you use the sheet and see parameter codes or method codes that need to be updated please send an email to email@example.com.
Also available for download is Water Quality Informaion Note 2011.06 which describes procedures relevant to entering age dating data into NWIS.