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Abstract The New Zealand Geotechnical Society’s “Guideline for the field classification and description of soil and rock for engineering purposes” (NZGS, 2005) has for 13 years been the standard by which soil and rock logging has been undertaken in New Zealand. NZGS (2005) does not…

Guideline for the field classification and description of soil and rock for engineering purposes. The overall aim of a method of soil and rock description is to reduce the subjective nature and variability of descriptions of materials encountered during the investigation, design and construction of an engineering project….