UPb: an object of class 'UPb' containing a high
precision U-Pb dataset packaged with Ken Ludwig's Isoplot
program.
DZ: an object of class 'detrital' containing a
detrital zircon U-Pb dataset from Namibia.
References
Ludwig, K. R. User's manual for Isoplot 3.00: a geochronological
toolkit for Microsoft Excel. No. 4. Kenneth R. Ludwig, 2003.
Vermeesch, Pieter, and Eduardo
Garzanti. "Making geological sense of 'Big Data' in sedimentary provenance analysis."
Chemical Geology 409 (2015): 20-27.