Submission Title

A Student Outcrop Mapping Project

Session Number

PS2

Location

Graves Gym

Abstract Number

PS2-t

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.

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COinS
 
Apr 23rd, 1:30 PM Apr 23rd, 3:00 PM

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.