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By Alan D. St. John

A fantastically produced, delicate survey of the complexities of "the different Oregon." a pleasant mixture of background, geology, normal heritage, and private impressions of either the well known and vague.

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Additional resources for Oregon's Dry Side: Exploring East of the Cascade Crest

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Springtime lupines and sagebrush in the eastern foothills of the Pueblo Mountains, Southeastern Oregon 47 Astoria Vegetation Zones of Oregon’s Dry Side St Helens Tillamook Hillsboro McMinnville Dallas Eastern Cascades Forests Newport Salem Albany Corvallis Blue Mountain Forests Northern Modoc Plateau Forests Basin and Range Saltscrub Desert Eugene Oak Woodlands Sagebrush-Bunchgrass Steppe 0 10 20 30 40 50 MILES Coquille Gold Beach Roseburg Grants Pass Medford Eastern Cascades Forests 0 Blue Mountain Forests 10 20 30 40 Northern Modoc Plateau Forests Basin and Range Saltscrub Desert Oak Woodlands Sagebrush-Bunchgrass Steppe 50 EEN HORN MTN S STR RAN R V N esc hu tes E D T M Jordan Valley ag ue R Frenchglen Lake Abert R Upper Klamath K Lake Klamath Klam Falls Lakeview Goose Lake Owy h RIV ER Hel ls Malheur Lake STE EN S an Syc Summer Lake Can yon S eR o nd R nt Owyhee Lake N A C ur R S Baker City ee A E R Mal heu r R Burns Harney Lake Klamath K M Marsh r Sp C T CAN O Chemult Crater Lake M Ontario B ERRY OL Enterprise GE R Fork John Day AW B E R R Y ies R Silv D Little NG B N GR er RA Bend EW A KE Fo N M T N S Prineville Redmond W SNA t e s R i ve r sc h u De R O C H O C O South John Day R C A Fo rk RN ay R nD Joh Middl e Madras Sisters LO E HO rk AL La Grande S B Fossil N N L U U Wa llow W ELK E M Condon O I A T wd Po River John Day G Heppner Shaniko roo ked R aha R Imn Moro Oregon City Um atilla Pendleton Arlington R The Dalles R a Portland RIVE Gra nd COLUM BIA Hood Ho River Ri N e MILES The sagebrush-bunchgrass association is the most distinctive, widespread vegetation zone east of the Cascades, so we’ll begin with this type of classic “high desert” environment.

Newberry’s sparkling obsidian beds may not continue to hold the record of being Oregon’s most youthful rocks. S. Geological Survey geologist discovered a broad swelling in the Three Sisters area west of Bend. Further study revealed that the swelling began in 1997 and continues to this day over an area of more than a hundred square miles. 5 inches per year). This swelling is due to magma slowly filling a chamber four miles down. Groups of small earthquakes shake the local USGS seismographs as deep rocks break and adjust to the swelling.

Towering woolly mammoths, twelvefoot-tall ground sloths, shaggy rhinoceroses, giant-sized bison, bears, wolves, beaver, and other oversized, cold-adapted megafauna dwelled in the chilled environment of this epoch. Forests of fir, spruce, cedar, and pine, mixed with groves of quaking aspen, adjoined open, grassy savannas where horses of several species grazed, along with camels and giant bighorn sheep. Large numbers of bird bones of many species have been retrieved from the shifting sands of Fossil Lake’s parched basin in the high desert of northwestern Lake County.

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