As the authors of Chapter 2 point out, the basal boundary of each chronostratigraphic unit (effectively stages because the base of a system will be the base of its lowest stage) is standardized at a point ("golden spike") in a reference section within an interval exhibiting continuous sedimentation.
Classically based on the largely marginal marine and pelagic rock record in Europe, the chronostratigraphic units (systems, stages, etc.) that developed are an incomplete record of geological time.
The problems concerning the use of this term as a chronostratigraphic unit
have already been discussed.
Revised correlation of Silurian Provincial Series of North America with global and regional chronostratigraphic units
and [[delta].sup.13][C.sub.carb] chemostratigraphy.
In a very brief chapter, the 9 G, The International Stratigraphic Guide (ISG) states that "The basic principles used in subdividing the Quaternary into chronostratigraphic units
are the same as for other Phanerozoic chronostratigraphic units
, although the methods of time correlation may have a different emphasis.
The units described herein are all correlated approximately to the Aptian/Albian Stages, chronostratigraphic units
of the Lower Cretaceous (Comanchean) of Texas.The lithostratigraphy has been described extensively by other authors (Thurmond 1974; Winkler et al.
The chronostratigraphic units
of the Upper Carboniferous in Europe.