| OCR Text |
Show 63 in the Mineral Fork common glacier that constantly A Formation, sandstone and siltstone in this layers gradational relationships. as suggests receeding a downvalley lakes. lost contact with problem does exist none;raded. this interpretation. Most of the observed in the field do not rAve According Bradley (1929) to the graded nature of most of the thin bedded siltstone and sandstone deposits is not characteristic of most varved sequences. Gen.eral inforation in the literature suggests that it is not characteristic of turbidites either. pendicular to studies of thin sections cut per However, bedding in a graded portion of a sequence show characteristics that accordi to pe 172) stone of typical are glacial varves sample seven, page 56 of this In Little Cottonwood Canyon, distinctly bedded aspect even if a oontained an well a active flow enters a (Hartschcrn, 1958, In a sense, turbidite in 3 for sand Alta, and immediately above is interbedded with thin bedded in teat location. layered aspect is the result of mudflow Nudflow is characteristic (1957, sandstone, with the result that the forma.tion has sitstone and ready Pettijohn report). l-lest of Hellgate Spring, tilloidal material that the (see thin-bedded siltstone entirely possible of the formation noted at this location redeposition o. till into lake that al a developed sequence of thin-bedded agent lake, p. It is in all till it can 481, produce sediment. deposition areas, and features like those observed a.nd Kuenen a.nd Migliorini, 1950, p, this may iricate that the formation is a to shrinkage cracks are 124). fresh water part. P!B.rely, ma.rkings similar a found on , . |
