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West edge of W Rift Zone, Iceland
West edge of western Rift Zone, Iceland, view southward. (180906-34)
Download ImageHaystack Rock at Cannon Beach, Oregon
Haystack Rock at Cannon Beach, Oregon. The sea stack marks the vent area of an undersea volcano that was fed by magma in turn fed by flows of the Columbia River Basalt Group. (170826-19)
Download ImageCross-bedded sandstone, Oregon
Miocene Astoria Formation along base of sea cliff and road at Hug Point, Oregon. Note the abundant cross-bedding (180728-118)
Download ImageAlcove and tidepool, Oregon Coast (square)
Alcove and tide pool eroded into Miocene Astoria Formation near Hug Point, Oregon. Upward limit of barnacles indicates mean high tide level. (180728-124)
Download ImageBasaltic sea cliffs, Oregon
Basaltic sea cliffs at Neahkahnie Mountain, Oregon coast –intrusive basalt of the Columbia River Basalt Group. (180728-165)
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Cross-bedded sandstone, Oregon
Cross-bedded sandstone of the Miocene Astoria Formation, Hug Point, Oregon. Photo taken from small road (circa 1800s) blasted along base of cliff. (180812-72)
Download ImageSandstone sea cliffs, Oregon
Miocene Astoria Formation along base of sea cliff and road at Hug Point, Oregon. (180812-63)
Download ImageContorted Miocene sandstone
Tightly folded Astoria Formation near Hug Point, Oregon. (180812-50)
Download ImageLandslide scar and toe, Oregon Coast
Small landslide toe near Hug Point along the Oregon Coast. (180812-27)
Download ImageHeadlands near Hug Point, Oregon (Pan)
View northward past Hug Point to Ecola Point, Oregon Coast. Note basaltic sill and small sea cave (180812-26)
Download ImageCross-bedded sandstone, Oregon
Cross-bedded, coarse-grained sandstone of the Miocene Astoria Formation, Hug Point, Oregon. (180812-18)
Download ImageContorted Miocene sandstone
Tightly folded Astoria Formation near Hug Point, Oregon. (180812-15)
Download ImageBasaltic dike intruding basalt (Vertical)
Basaltic dike intruding basalt, Cape Perpetua, Oregon. Pocket knife for scale. (180805-5)
Download ImageEdge of basalt dike: chilled margin, baked zone
Basalt dike (left) intruding basalt flow (right). The dike gets finer grained towards the contact (chilled margin) whereas the country rock shows a dark-colored baked zone along the edge of the dike. Cape Perpetua, Oregon. (180805-4c)
Download ImageEdge of basalt dike: chilled margin, baked zone
Basalt dike (left) intruding basalt flow (right). The dike shows a subtle decrease in grain size towards the contact (chilled margin) whereas the country rock shows a dark-colored baked zone along the edge of the dike. Cape Perpetua, Oregon. (180805-4)
Download ImageIntrusive sill and contact metamorphism (vertical)
Diorite sill and bleached reaction zone of contact metamorphism in the adjacent country rock-Purcell Sill intruding Proterozoic Helena Fm, Glacier National Park, Montana. Sill is about 2 meters thick. (4GlD-016)
Download ImageIntrusive sill and contact metamorphism
Diorite sill and bleached reaction zone of contact metamorphism in the adjacent country rock-Purcell Sill intruding Proterozoic Helena Fm, Glacier National Park, Montana. Sill is about 2 meters thick. (4GlD-015)
Download ImageStromatolites and glacial striations
Proterozoic stromatolites heads and glacial striations. Helena Formation, Glacier National Park, Montana. (4GlD-014)
Download ImageStaurolite “cross” in schist (square)
Staurolite crystals in schist. Photo is about 6cm across. (180427-26)
Download ImageSeed Fern fossils-Pennsylvanian
Lower Pennsylvanian plant fossils in shale: Neuropteris, a seed fern. Image is about 10 cm across. (180427-23)
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