Most geologists must have had occasion at some time or other to regret the fact that sedimentary analysis of rock samples, collected during expeditionary surveys, must necessarily lag far behind the field work. Frequently, however, preliminary microscopic examination of selected specimens may reveal outstanding features of immediate value in the prosecution of the survey. Moreover, detailed field work may be facilitated in areas where something is already known of the microscopic characters of the rocks, if means are available for recognition of those characters on the spot.

Many geologists have doubtless improvised equipment to bridge the gap between the field...

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