Abstract
The referring of sedimentary horizons to a standard column for a province commonly results in benefit to the geologist, for areal gradation and facies then become his allies when unravelling a whole. The use of local, duplicate names commonly hinders correlation, for when geological data form isolated groupings, areal gradation and facies become matters of bewilderment. A standard column may be based on those types having priority which satisfy the requirements of utility. The fullest sections available may thereafter be used as controls to establish superimposition and ranges. California is cited as an example. Some regional correlations are given, and units available for use in the Miocene, Pliocene, and lower Pleistocene parts of a standard marine column are listed.
Published Version
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