This map is based on analysis of 92,227 stream sediment samples collected at an average sampling density of 1 per 2 square km during field campaigns from 1969 to 2004. (Adobe Acrobat PDF 1.06 MB)
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Geological observations are made according to the prevailing understanding of the subject at the time. The quality of such observations may be affected by subsequent advances in knowledge, improved methods of interpretation, and better access to sampling locations.
Raw data may have been transcribed from analogue to digital format, or may have been acquired by means of automated measuring techniques. Although such processes are subjected to quality control to ensure reliability where possible, some raw data may have been processed without human intervention and may in consequence contain undetected errors.
Detail clearly defined and accurately depicted on large-scale maps may be lost when small-scale maps are derived from them.
Although samples and records are maintained with all reasonable care, there may be some deterioration in the long term.
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