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The Sugar House 7.5-minute quadrangle is located within Salt Lake County on the eastern margin of Salt Lake Valley and includes part of the Wasatch Range. Bedrock exposed in the Wasatch Range is Precambrian to Jurassic with Tertiary dikes and sills (igneous intrusions). Except for glacial deposits on the mountain peaks and various deposits in valleys of the Wasatch Range, surficial deposits are mainly west of the Salt Lake City segment of the Wasatch fault zone in the Salt Lake Valley. Thick late Pleistocene (30 to 13 ka) Lake Bonneville deltaic and lacustrine deposits are prevalent mostly west of the Wasatch fault zone. These deposits are incised by post-lake streams and overlain by stream terraces. The East Bench fault of the Salt Lake City segment of the Wasatch fault zone is the main Holocene-active normal fault in the quadrangle. The Mount Olivet strand of the East Bench fault is mapped just to the east of the East Bench fault. The Nibley Park fault is mapped to the west of the East Bench fault, timing of most recent movement is uncertain. There is also evidence for an older basin-bounding normal fault, the Foothill fault, along the mountain front, that lacks evidence for Holocene offset. |