General Problems in Division of the Precambrian
Rocks and their assemblages or rock records have long been the object of geologic studies. Many pages of this record have not been preserved, and many of those known have not been understood. Historical geology aims at deciphering these pages recorded in an unknown language, at reconstructing their general sequence and clarifying the contents of the buried pages. In reading these rock records geologists apply many different methods and theories their own science, as well as of many branches of the natural and physical sciences. These methods, refined with time, lead to progress in geologic science as a whole and in studies of Precambrian geology in particular. We face great difficulties in determining the succession of rock record studies or the succession of occurrence and origin of rocks even within a relatively small area. The determination of synchroneity of events imprinted in rocks of different remote areas becames much more difficult. How is this problem to be solved?
KeywordsManganese Zeolite Uranium Sedimentation Shale
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