Isopach Map- A type of hypsometric and isoline map, contours connect points of equal rock or sediment thickness. This map shows sediment thickness of the Rio Blanco tephra deposit from the Active Crater of the Rincon de la Vieja volcano approximately 3,500 years Bp. This can also be classified as a choropleth map, as varying regions of sediment are divided into intervals and color coded accordingly (http://www.geo.utexas.edu/faculty/barker/kempter/rbtephra.html).
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