Isopach
Deposit Modelling and Archaeology, Guidance for Mapping Buried Deposits, published by Historic England on 31 January 2020, suggests that an isopach is: ‘A line (contour) joining points of equal value. An isopach map is a contour map illustrating thickness variations within a sediment body over an area.’
It is sometimes used to refer to: ‘…both its correct meaning, the perpendicular distance between the upper and lower boundary of a stratigraphic unit (true stratigraphic thickness), and the vertical thickness of a deposit (true vertical thickness, which is correctly displayed as an isochore map).’
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