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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Clay Mineral Composition of the Tipton Shale Member of the Green River Formation (Eocene) of Wyoming: NOTES
X-ray analyses indicate that illite, montmorillonite, and chlorite are abundant in the less-than-2-µ fraction of the Tipton Shale Member of the lacustrine Green River Formation (Eocene). Material amorphous to X-rays and mixed-layer structures are present in subordinate amounts. These minerals have been known to occur in rocks of lacustrine origin, but this investigation shows a general correlation between lithology and clay mineral suite. An illite suite is restricted to the to the argillaceous and analcimic tuffs near the top of the member. A chlorite-illite suite is found only in the coarser clastics developed in the middle of the member, and a montmorillonite-illite suite is restricted to the montmorillonitie tuffs and oil shales at the base of the member. Source rock and dia enetic alteration account for the distributional pattern.
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