The mud loggers also collect bags of rock cutting samples at regular intervals while the well is being drilled. These may be used later for biostratigraphic and lithological analysis.<ref name=Whittaker_1992>Whittaker, A., 1992, [[Mudlogging: the mudlog|Mudlogging: The mudlog]], in D. Morton-Thompson and A. M. Woods, eds., [http://archives.datapages.com/data/alt-browse/aapg-special-volumes/me10.htm Development geology reference manual]: AAPG Methods in Exploration Series 10, p. 101–103.</ref> | The mud loggers also collect bags of rock cutting samples at regular intervals while the well is being drilled. These may be used later for biostratigraphic and lithological analysis.<ref name=Whittaker_1992>Whittaker, A., 1992, [[Mudlogging: the mudlog|Mudlogging: The mudlog]], in D. Morton-Thompson and A. M. Woods, eds., [http://archives.datapages.com/data/alt-browse/aapg-special-volumes/me10.htm Development geology reference manual]: AAPG Methods in Exploration Series 10, p. 101–103.</ref> |