#IdahoGeology
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jfrishman.bsky.social
From my latest set, a nice rock exposure in Hells Canyon
#RockinTuesday #geology #idahogeology #hellscanyon
Closeup photo of rock outcrop, in which somewhat straified-looking vertically tilted dark gray-green stone surrounds an oval of green and orange rock, with a prominent band of pale green rock present at the right of the image.
March 3, 2026 at 10:26 PM
jfrishman.bsky.social
Fresh Hells Canyon research - you know you want it!
#idaho #oregon #geology #hellscanyon #saqanma #idahogeology #geomorphology
June 3, 2025 at 12:23 AM
jfrishman.bsky.social
Resharing this #RockinTuesday - these images are illustrations for my essay on Idaho's oldest rocks in Seasons of the 208 Magazine issue #2, hitting local shelves today.
#geology #idaho #idahogeology #schist #gneiss #precambrian
jfrishman.bsky.social Jackson Frishman @jfrishman.bsky.social · Apr 29
#RockinTuesday Last week I took a little tour to photograph some of the oldest rocks in Idaho. Here are four details from the Priest River Metamorphic Core Complex, with ages from around 1.6 to 2.6 billion years.
#geology #idaho #idahogeology #idahopanhandle #schist #gneiss
Detail image of schist outcrop in northern Idaho. Rock is primarily yellow-orange with darker banding visible, with some bands compressed into wavelike pattern by metamorphic processes. A smattering of pale green lichen is visible. Detail of highly metamorphosed rock outcrop in northern Idaho. Rock is mostly black and white in a sort of reticulated pattern, with two reddish inclusins (garnets I think? ) visible. Mineral specks in the black rock can be seen reflecting more vividly colored glints of orange and blue if one looks closely. Detail of gneiss boulder in northern Idaho. The rock is full of contrasting bands of dark gray and white, with the banding folded by metamorphic processes into an overall L-shape. Detail of roadcut in northern Idaho. Top right of image is mostly full of dark black stone (amphibolite?) marbled with veins of white, while lower left is mainly banded schist with an overall rusty hue, and with obvious folding and boudinage. Some vertical lines of dynamite drill holes from the road cut are visible in the scene.
September 2, 2025 at 4:24 PM
jfrishman.bsky.social
#RockinTuesday Last week I took a little tour to photograph some of the oldest rocks in Idaho. Here are four details from the Priest River Metamorphic Core Complex, with ages from around 1.6 to 2.6 billion years.
#geology #idaho #idahogeology #idahopanhandle #schist #gneiss
Detail image of schist outcrop in northern Idaho. Rock is primarily yellow-orange with darker banding visible, with some bands compressed into wavelike pattern by metamorphic processes. A smattering of pale green lichen is visible. Detail of highly metamorphosed rock outcrop in northern Idaho. Rock is mostly black and white in a sort of reticulated pattern, with two reddish inclusins (garnets I think? ) visible. Mineral specks in the black rock can be seen reflecting more vividly colored glints of orange and blue if one looks closely. Detail of gneiss boulder in northern Idaho. The rock is full of contrasting bands of dark gray and white, with the banding folded by metamorphic processes into an overall L-shape. Detail of roadcut in northern Idaho. Top right of image is mostly full of dark black stone (amphibolite?) marbled with veins of white, while lower left is mainly banded schist with an overall rusty hue, and with obvious folding and boudinage. Some vertical lines of dynamite drill holes from the road cut are visible in the scene.
April 29, 2025 at 6:31 PM
tumbleweird.bsky.social
Ice Age Floods Institute June Events Schedule

tumbleweird.org/ice-age-floods-institute/

#IceAgeFloods #MissoulaFloods #GeologyRocks #ChanneledScablands #PNWHistory #InlandNorthwest #STEAMEducation #TheREACHMuseum #LakeWenatchee #IdahoGeology #ScienceCommunication #FieldTrips #IAFI
Ice Age Floods Institute - JUNE EVENTS SCHEDULE
Free STEAM Workshops for K-12 educators, June 22 at the REACH Museum!
tumbleweird.org
June 3, 2026 at 3:29 PM