
Width of strata in stratigraphic column?
1 Expert Answer

Gerald E. answered 06/14/22
Retired oil industry geologist with university teaching experience
A stratigraphic column is constructed by drawing a vertical rectangle, the height of which is controlled by a linear scale ( feet or meters), and which reflects that actual measured thickness of the stratigraphic column of rock being portrayed. Either the left or right side of the vertical rectangle is used to indicate the relative hardness of the rocks depicted in the column, with the hardest being the most resistant and the closest to the full width of the column, while the softest is offset the most from that side of the column. Contacts between the rock layers are shown as erosion surfaces (unconformities) or normal bedding planes.The offsets of beds are used to indicate the relative hardness of the adjacent layers. Thus, the hardest extend closest to the border of the vertical rectangle while the softest are shown the farthest from the edge.An arbitrary amount of offset is established for each relative hardness.
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Gerald E.
Usually, one side left) of the stratigraphic column is a straight vertical line. The right side has a baseline distance (width) from the left side, and the vertical portion is broken into sections based upon the differing rock contacts as measured from a base. The width from the left side to the right side of the column is used to represent relative strength (resistance to weathering) of the individual rock layers. The hardest most resistant layer extend furthest to the right and the least resistant are furthest to the left. For example a hard conglomertae layer overlying a soft shale would extend further to the right than the shale.07/06/21