Reading Surficial Materials Maps - Figure 2

Figure 2. Subsurface records from observation wells and test borings provide the most detailed information shown on the materials maps. These records are shown as lengthy strings of letters in the figure (refer to Figure 3 for more information). At the other extreme, observations at shovel or hand-auger holes only show the type of material at a shallow depth from the land surface. Auger holes are shown by a dot in a circle in the figure, and the material is shown by an abbreviation -- cy for clay for instance. Deposits which may occur under this surface layer are not known. The map user should be aware of this distinction when interpreting the data shown on the map.

Last updated on October 6, 2005