. Bulletin. Natural history; Natuurlijke historie. 94 PEABODY MUSEUM BULLETIN 27 clayey silts. Between the extremes of clean sand and the clayey sand of the fringe areas a complete range of variation in the ratio of the silt-clay fraction to the sand is expectable and with careful selection of spot samples such a range in variation could no doubt be demonstrated. However the significant fact is that the high silt-clay content is usually found in the lower part and along the western edge of the Timber Udden-Wentworth scale I 1/2 1/4 1/8 1/16 mm. r~C r~M r~F l VF Uand. FIG. 8. Size composition o
. Bulletin. Natural history; Natuurlijke historie. 94 PEABODY MUSEUM BULLETIN 27 clayey silts. Between the extremes of clean sand and the clayey sand of the fringe areas a complete range of variation in the ratio of the silt-clay fraction to the sand is expectable and with careful selection of spot samples such a range in variation could no doubt be demonstrated. However the significant fact is that the high silt-clay content is usually found in the lower part and along the western edge of the Timber Udden-Wentworth scale I 1/2 1/4 1/8 1/16 mm. r~C r~M r~F l VF Uand. FIG. 8. Size composition of sands from the Timber Lake Member represented by cumulative cinves. L Current-bedded sand of Taticredia-Ophiomorpha biofacies, Loc. 48, section H, unit 7. 2. Sand with near-shore TaficrecUa-Dosiniopsis-Ostrea-Pleria association, Loc. 83. 3. Sand with abundant off-shore fauna incluciing Cucullaea, Loc. 35, section 9, unit 5. 4. Clayey sand transitional to Irish Creek lithofacies, Loc. 35, section 9, unit 1. Lake sandstone where it is associated with particular bedding structures and biofacies that are different from those in the remainder of the sandstone body, although to subdivide the Timber Lake sandstone body for discussion on the basis of its more clayey and less clayey parts would be an over-generalization obscuring its internal complexity. The few size analyses of the Timber Lake sandstone indicate that the degree of sorting is locally variable, a fact that is quite evident from field inspection. The sand-size particles are generally well sorted as the range of dominant grades in the type. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. New Haven : The Museum
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