A demonstration is given to show the feasibility of carrying out thin-section grain size analyses on some almost pure carbonate calcarenites. In a cross-stratified coquina from the Miocene of Salum, Egypt, grain size measurments were made on certain bioclasts that are relatively resistant to diagenetic changes. Each kind of bioclast is well sorted. Since skeletal particles of coralline algae and quinqueloculinides have larger median diameters than those of the associated and hydraulically equivalent peloid particles, it is inferred that the former bioclasts had no solid infillings of their cells and chambers during their original reworking and final deposition.

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