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coarse white tuffaceous soils from rhyolitic tuff substrate of grassy road right-of-way at crest of eastern escarpment of the Madrean plateau
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on open grassy road right-of-way among scattered oaks. Volcanic rhyolitic tuff substrate
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on open slope of rhyolitic tuff gravelly soil on grassy road right-of-way
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on open ridge of rhyolitic tuff in gravelly soil on grassy road right-of-way at crest of eastern escarpment
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thin soil in swales and crevices of flat ridge of exposed rhyolitic tuff
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thin soil in swales and crevices of flat ridge of exposed rhyolitic tuff
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rhyolitic tuff outcrops on south slope of hill above north side of road with Quercus jonesii, Quercus tarahumara, Juniperus durangensis
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open roadside on coarse granitic roadbed mixed over substrate of volcanic tuff and tuffaceous rhyolite at crest of the eastern escarpment onto Madrean plateau.
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clearing in pine flats of the Madrean highlands on shallow volcanic soil over rhyolitic tuff substrate
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open roadside, crest of eastern escarpment of Madrean plateau in thin soil & gravel over volcanic tuffaceous substrate.
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