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The Mazur well in the southeastern Anadarko basin of Oklahoma penetrates the McLish (oldest), Tulip Creek, and Bromide Formations of the upper part of Middle Ordovician Simpson Group. Lithofacies and petrographic analysis of 650 ft of core indicates deposition in a rapidly subsiding aulacogen. Lithofacies associations suggest that the deposits accumulated in cycles that consist of mudstone-siltstonelimestone in the lower part of the lithofacies sequence and quartzarenite in the upper part. The lithofacies sequence in the lower part of the cycles is interpreted as deposits of subtidal to intertidal environments. The lithofacies sequences in the upper part of the cycles are deposits of tidal channels. The sandstones are made up of generally rounded and well-sorted to moderately sorted quartz grains and exhibit highly quartzose characteristics. They consist of framework grains and cement and lack detrital matrix. The framework grains are composed of monocrystalline and polycrystalline quartz (as much as 99 percent); feldspar (as much as 4 percent) including orthoclase, microcline, and perthite; and rock fragments (as much as 12 percent) consisting of chert, micaceous rock fragments, siltstone, shale, limestone, glauconite, cellophane, and skeletal fossil fragments. Cements include silica, carbonate, and clay. The silica cement consists of quartz overgrowths, and the carbonate cement comprises calcite, ferroan calcite, ferroan dolomite, and ankerite. The mineralogical and textural maturity of the sandstones suggests deposition in tidal-influenced environments in which winnowing by waxing and waning tidal currents promoted clean, mature sediments.

Petrology and depositional facies of siliciclastic rocks of the Middle Ordovician Simpson Group, Mazur Well, southeastern Anadarko Basin, Oklahoma