The National Natural Landmarks (NNL) Program encourages the preservation of exceptional examples of the nation’s biological and geological features. To qualify for NNL designation, a site must be one of the best examples of a geological or biological feature within a biophysiographic province. Mount Howard - East Peak represents a...
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Significance Criteria as a National
Natural Landmark to Represent Montane Grasslands in the
Columbia
exceptional examples of the Nation’s biological and geological features. To qualify for
NNL designation, a site must be one of the best examples of a geological or biological
feature within a biophysiographic province. Zumwalt Prairie represents a perfect example
of this concept, containing one of the largest remnants of native...
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as a National Natural Landmark
Representing Plateau Grasslands in the Columbia Plateau
The Washougal Mining District is located on the western flanks of the southern Cascade Range of Washington, approximately 50 km (30 miles) northeast of Vancouver, Washington. The district has produced only $573 since 1903, derived from copper and silver. The presence of hydrothermal mineralization and breccia pipes similar to those...
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Star Stock, Washougal Mining District,
Skamania County, Washington
by
Richard James Shepard
A
Himalayan collision produced frontal and lateral
ramps and associated Pliocene to Quaternary tectonic
geomorphic features in the foreland fold-thrust belt of
northwestern Pakistan. The transpressional right-lateral
Kalabagh tear fault zone displaced the emergent Surghar
Range frontal thrust from the western Salt Range by 16-19
km since 1.9-2.1 Ma: the age...
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Geophysics of the Foreland Fold-Thrust Belt
of Northwestern Pakistan
by
James W. McDougall
A THESIS
The volcanic rocks of the Harney Basin comprise a bimodal
assemblage of rhyolites (SiO₂ greater than 72%) and basalts (SiO₂
less than 52%). Tholeiitic basalts account for 15 rocks analyzed and
alkalic basalts for three. Most basalts contain phenocrysts of olivine
and plagioclase. Pyroxene phenocrysts were not found. Rhyolite
flows...
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magma.
Petrology of Selected Volcanic Rocks of the
Harney Basin, Oregon
by
Donald James Parker
A