About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
Montana Geological Society
Abstract
MTGS-AAPG
MONTANA GEOLOGICAL SOCIETY FIELD CONFERENCE & SYMPOSIUM GUIDEBOOK TO SOUTHWEST MONTANA
August,
VAN HORN PEAK-A WELDED TUFF VENT IN CENTRAL IDAHO
ABSTRACT
Geologic mapping by the U.S. Geological Survey in the northeastern part of the Challis 1°x2° quadrangle in Idaho has disclosed a multiple cauldron complex centered at about lat. 44°42' N. and long. 114°32' W. Uplift of the cauldron complex, coupled with deep erosion both within and outside the complex, has exposed a welded tuff feeder vent forming Van Horn Peak—a prominent and scenic landmark in the Challis area The Van Horn Peak vent is nearly circular in plan view and is about 1 6 km in diameter The vent cuts a variety of intracauldron tuffs, debris flows, and lacustrine strata. The feeder gave rise to at least two sequences of ash-flow tuff belonging to the Challis Volcanics that are approximately 46 m.y. old.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
Watermarked PDF Document: $14 | |
Open PDF Document: $24 |