Description:

A 2 or 4 character code used in the ASTM classification of unconsolidated deposits.  Deposits having characteristics of two lithologic groups are designated by a combination of the two character ASTM symbols.  The predominant group is entered as the second 2-character code.  For example, if the lithologic description is silty sand with clay, the ASTM Code would be "CLSC" with SC being the dominant lithology.  If the material is composed of a single group, then only one 2 character code should be entered.  If the layer consists of consolidated material, use the code "NACM" for the ASTM code and enter the appropriate LITHCODE in the Lithology Code field.