New Technique for Three-Dimensional Fabric Analysis of Till and Englacial Debris Containing Particles from 3 to 40 Mm. in Size

Abstract

The technique described involves (1) collection from the field of an oriented block of till or englacial debris, (2) laboratory reorientation of the block on the stage of a large two-circle contact goniometer, (3) measurement of the orientation of critical parameters of particles in the 3-40-mm. size range, and (4) treatment of the results by standard methods or, where applicable, by a useful new statistical test. Total error in orientation measurements of individual particles runs as low as 6°-8°, on the average. Initial applications of the technique show that 6-8 hours are commonly required for a complete fabric analysis.