|
One powerful method of correlating strata is called "graphing correlations", and was developed by Shaw in 1964. This method can also be used for correlating strata based on other characteristics such as the presence of certain isotopes or mineral phases. To make a graphing correlation, FAD and LAD data are plotted on a basic X-Y graph. The X axis plots the Standard Reference Section (SRS-the section against which all other sections will be referenced against). The Y axis plots the distance from the base of your column at which either the FAD or LAD appears, relative to the SRS. Dog legs in a graph represent periods of non deposition, also known as a "hiatus". |
 Click on this image to expand it. |
 |
 |
 |