Abstract
A partly modified planimetric/square graph paper method of mechanical analysis was developed for analyzing the Riasi Tillite which is of quartzitic composition and whose mineral or rock components cannot be separated from each other without much loss of their size by any reported chemical or mechanical techniques so far used. The method works under the principal of model analysis (Chayes, 1956), but here any size of specimen which contains grains having different shades of color can be used. The rock specimen to be analysed by these methods is polished very fine from all possible sides and then with the help of a planimeter/square graph paper the area of the various polished surfaces and the grains on them is calculated and the percent frequency of each size range determined. Based on such calculations, many samples of the Riasi Tillite were analysed and their histograms and cumulative curves have been drawn. The character of these curves confirms that the socalled “brecciated quartzitic grit” (Middlemiss, 1928) is nothing but tillite (Riasi Tillite by Wakhaloo and Sharma, 1970).
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