A Student Outcrop Mapping Project
Faculty Sponsor
Andrew Buddington, Spokane Community College
Research Project Abstract
This student group project involved mapping and photographic documentation of an outcrop located along the northern boundary of the Spokane Valley of eastern Spokane County, within the southern portion of the Priest River complex. The project involved field examination of a 230 m long outcrop of Hauser Lake Gneiss (HLG), consisting of medium- to coarse-grained, quartzofeldspathic paragneiss with interlayered biotitic schist. Within the eastern portion of the outcrop is a 10 m thick amphibolite body that is concordant to the gneissic foliation. The general structure of the outcrop consists of westerly-dipping, foliated bands of quartz and feldspar-rich gneiss and biotitic schist. The foliation strikes at 207o and dips 35o to the west. This banded sequence of quartz-feldspar gneiss and biotite schist is consistent with the protolith lithology of the Prichard Formation (Proterozoic Belt Supergroup) found in northern Idaho and north-western Montana.
Session Number
PS2
Location
Graves Gym
Abstract Number
PS2-t
A Student Outcrop Mapping Project
Graves Gym
This student group project involved mapping and photographic documentation of an outcrop located along the northern boundary of the Spokane Valley of eastern Spokane County, within the southern portion of the Priest River complex. The project involved field examination of a 230 m long outcrop of Hauser Lake Gneiss (HLG), consisting of medium- to coarse-grained, quartzofeldspathic paragneiss with interlayered biotitic schist. Within the eastern portion of the outcrop is a 10 m thick amphibolite body that is concordant to the gneissic foliation. The general structure of the outcrop consists of westerly-dipping, foliated bands of quartz and feldspar-rich gneiss and biotitic schist. The foliation strikes at 207o and dips 35o to the west. This banded sequence of quartz-feldspar gneiss and biotite schist is consistent with the protolith lithology of the Prichard Formation (Proterozoic Belt Supergroup) found in northern Idaho and north-western Montana.
