STRATIGRAPHY OF THE MIDCONTINENT RIFT SYSTEM IN IOWA
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UNIT G |
Unit G, encountered at depths from 1085 to 1407; (3615 to 4690 ft), is dominated by pale gray (clear) to red brown, fine to medium grained sandstone interbedded with red brown (and minor green) siltstone and shale (Witzke, 1990). The sandstones are dominated by quartzose grains, with a mean framework grain composition of Q=76 F=17 L=7 (click here for QFL information). The volcanic rock component of the lithic grain population in this interval (35%) is the highest observed in any clastic unit in the Eischeid well (Ludvigson and others., 1990).
click for depositional model for Unit G
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