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Geology topics

Irving J. Witkind

Publications and source records attributed to Irving J. Witkind.

10 recordsLinked to original sources
USGS1994

The role of salt in the structural development of central Utah

Multiple episodes of diapirism, probably salt generated, have determined the structural pattern of central Utah. The causative salt and other evaporites are integral components of the Arapien Shale of Middle Jurassic age, one of the most unusual stratigraphic units in central Utah.

Utah↗
USGS1977

Major active faults and seismicity in and near the Big Fork-Avon area, Missoula-Kalispell region, northwestern Montana

This is one of a series of environmental maps of a study area that overlies parts of Flathead, Lake, Missoula, and Powell Counties, northwestern Montana. The area extends from Big Fork, in Lake County, on the north to Avon, in Powell County, on the south, essentially as outline in figure 1. The environmental study was undertaken by the U.S. Geological Survey in response to a request from the Regional Planning Association of Western Montana who believed that the data gathered would be of significant use to county land-use planner.s

Montana↗
USGS1975

Preliminary results of a gravity survey of the Henrys Lake quadrangle, Idaho and Montana

A gravity survey of the Henrys Lake quadrangle shows that a gravity low with about 10 milligals of closure coincides with the Henrys Lake basin. The low is interpreted to reflect a basin fill of 1,100 m or more of Cenozoic sediments and volcanic rock. The data indicate that on the east and probably on the west the basin is bounded by northwest- and north-trending faults, and near its waist by the east-trending Centennial fault. A model constructed across the Henrys Lake basin suggests a northwest-trending fault, located near the southeast corner of Henrys Lake and concealed beneath the basin fill. The sparse gravity data east of the Centennial Mountains are not sufficient to provide any evidence on the extension of the Centennial fault across the Henrys Lake basin.

Idaho, Montana, Wyoming↗
USGS1975

A proposed glacial history of the Henrys Lake Basin, Idaho

Deposits of several glaciations from oldest to youngest, pre-Bull Lake, Bull Lake, and Pinedale are in and near the Henrys Lake basin, a northwest-trending hourglass-shaped trough in southeastern Idaho. Glacial deposits of pre-Bull Lake age are represented by till remnants confined mostly to the higher levels of the surrounding mountains. The extent of Bull Lake ice into the basin is uncertain. Glacial deposits and ice-marginal features suggest that a lobe of Bull Lake ice the Henrys Lake ice lobe moved into the basin and advanced as far north as the north edge of Henrys Lake. After this lobe melted back far enough to expose the north end of the basin, melt waters, chiefly from alpine glaciers in Targhee Creek and its tributaries, formed the broad low Howard Creek fan at the mouth of the valley of Howard Creek. Shortly thereafter, a complex of channels was cut into the fan by periodic melt-water floods which flowed westward through Targhee Pass during the waste of another Bull Lake ice lobe which lay in the West Yellowstone Basin. Melt waters from various sources ponded to form a shallow lake in front of the wasting Henrys Lake ice lobe. Waters from this lake drained southwestward around the southwest flank of the lobe via an ice-marginal channel. Upon total melt of the ice lobe, the lake was drained, the ice-marginal channel was abandoned, and the waters resumed their pre-ice course to the southeast. During the interglaciation, prior to the onset of the Pinedale Glaciation, northward-flowing streams deposited a veneer of obsidian sand and gravel along the south edge of the basin. In Pinedale time, alpine glaciers formed in the high mountain valleys near the basin, but none advanced into the basin.

Idaho↗
USGS1973

Radiometric ages of intrusive rocks in the Little Belt Mountains, Montana

Radiometric ages indicate that most, if not all, of the major intrusions in the Little Belt Mountains, central Montana, were emplaced during the Eocene epoch, between 48 and 54 m.y. ago. In the Hughesville area, igneous activity continued, or was episodic until 42 m.y. ago. As a result of the continued igneous activity, radiometric ages in the Hughesville area can be interpreted either as primary ages or as reset ages.

Montana↗