FAGHt HRNU BULLKT1N, RN1), OIUCMOn, THUILSDAY, AVflUflT 10, 10UO. t P I CROSBY REPORT TELLS HISTORY OF EARLY AGES (Contlnuod from pngo 1.) to tholr Imported flulillty, thcso lavas illd not, na n rulo. extend far from tho vonls, which wcro chlolly confined to tho great fissure, tho characteristic, also, ot subordinate and branch flBsures. Prom this poriod dato tho most, at least, ot tho old, orodod rhyollto volcanoes mid plugs scattered ovor tho plateau for 50 to 100 miles caBt ot tho Cas cades and protruding as stcptocs through tUo subsequent great flows ot basalt. Tho mora important only ot thcso stcptocs havo been named nnd mapped, Including: Newberry Crntor (Paulina Mountains), Pino Mountain, Powell Butte, Horse. Hdgc, Smith's Rock, Gray's Unite, Haystack llutto, Hampton Butte, Glass Buttos, Wngontlro mountain, Horso Mountain, Junlpor Mountain, Coyote Hills, etc. lrcf Deposits Formed. Although tho relatively ncld nnd sluggish lavas ot this period did not spread far from the vents, nnd contributed but little, and that little very locally nnd irregularly, to tho upbuilding ot tho general surfucc ot tho plateau, they have, neverthe less, by virtue of tholr hardness nnd durability, played an Important role as dralnago controls, or natural dams retarding and regulating tho discharge ot rivers. In tact, It would bo difficult to And a more striking or pertinent illustration than is presented In the old stock or mass ot rhyollto to which wo owe Ilonham Falls, tho most Important and most beautiful cascade ot this shooting river, a natural dam si to, and aboro it a natural reservoir Bite as wall. The scdlmonts of tnis period, con sisting of alternate beds of ash, lapll 11 and lava, aro known to geologists ns tho Clarno formation of tho John Day valley and attain here a thick ness of about 400 feet. Following tho Clarno formation, in Mloceuo or mid-Tertiary time, vol canism still prevailed, but tho lavas were, predominantly, of moro basic type basaltic rather than andlsltlc or rhyolltlc. Tho eruptions wcro, for a long tlmo of a highly exploslvo character, yielding In what Is now tho John Day valley and, presumably also, in tho region traversed by the Deschutes river, a vast thickness, possibly soverat thousand feet, ot stratified anh or tuff, constituting tho John Day scries. This was followed, still in tho Miocene poriod, by gi gantic flssuro eruptions of basalt tho many successive thick flows ag gregating 2000 to. possibly, 4000 feet in thickness. This Is the great Columbia lava formation, which, nat urally, attains Its maximum develop ment in tho valley of the Columbia, and is, presumably comparatively thinwhero It mantles tho crest ot cono time tho great vnlloyn of tho Columbia on tho north nnd tho Snnko on tho south woro filled to overflow ing and to n depth nt their lower cuds of fully 4000 feet. Somo conception of tho length of tho poologlc periods Is nftorded by tho prodigious amount ot erosion re quired to reopen tho lnva-floodod cnnyouB nnd thou, nttor they had been filled by tho Mnscall and Hat- tlesnako formations, to opon thorn ngnln nnd to tholr present profound depths. flinders Played Piirt. Tho principal eplsodo ot tho earlier Quaternary or Plolstocono tlmo was tor this region, ns tor tho greater part of tho continent, tho culmination ot glnclatlon. Thoro is llttlo or no evidence of general, glnclatlon or of nn Ico sheet covering tho uppor part even of tho Deschutes valley. The valley glaciers, remnants of which now linger on tho slopes and In tho craters of tho higher Cascado volcan oes, Including tho Sisters nnd llrokcn Top, appear never to havo extendod tar down tho eastern slopo of tho range. It Is truo that a largo pro portion ot tho lakes and lakelets dot ting tho lower enstcrn slopo ot tho ran go down to about nn elevation ot 4400, nnd to still lowor levels farth er north, nro duo to mornlnnt dams. To this class belong Odell nnd Cres cent lakes and many minor oxnm ples. Characteristically, they occu py, deep nnd narrow vnlloyn on tho rock walls of which tho lateral nnd tormlnul moraines nro roadlly traced to heights. In somo caso ot 1000 feet or moro above tho present water lev el. .Many of tho lakelets, also, oc cupy glacial cirques or rock-rlinmed basins directly duo to tho eroslvo ac tion of tho valley glaclors. Equally conclusive evidence of former glac lal extension is afforded by the dls trlbution or tho bowlder clay or ground moraine. As this would bo tho case but for tho heavy mantle of post-glacial pumico dust and lapllll covering tho ontlro region and ob scuring tho drift and other surface formations. Moro convincing, under tho circumstances, Is tho testimony of tho washed or modified drift, sand nnd gravel, especially ns regards Its topographic liifluonco. A particular ly clear examplo is afforded by tho Twin lakes, southeast of Crane prair ie, and 10 miles cast of tho Cascado crest. Tho only satisfactory expla nation of tho deep depressions occu pied by theso lakelets Is the subse quent melting of masses of ico bur icdln modified drift. From these witnesses wo learn that tho Cascado glacier or Ico cap extended at least this far to tho eastward. On tho cast sldo of the Deschutes valley wo find evldenco that New berry crater was occupied by Ico and that from it a glacier ndvanced sev eral miles down tho valley of Paulina creek and to lesser distances down other radiating valleys. Heat Predominated. We must conclude, then, that gln clatlon has not played an important Just nbovo tho stream northward, rhyollto on tho Blue mountains. Tho numerous rolo In tho development of tho Dos dikes of basalt cutting through tho chutes valley, not even ot this most underlying formations mark in part the channols through which tho lava lias come up from the Interior ot tho earth. Following this great outpouring of lava, tho most extenslvo In geo logic history, and almost completely filling tho broad and deep valleys of tho Columbia and Snake rivers, in lata Miocene tlmo, further explosive eruptions spreading over tho lava plateau of Central Oregon hundreds 'of feet ot ash, now consolidated to tuff and constituting the Mnscall formation. elevuted section ot it It further proof were wanted It would bo found in a consideration of tho cones ot cinder nnd lapllll dotting tho faco ot tho country nnd dating from tho earliest Quaternary tlmo down to tho human period and almost to tho pres ent. Thut somo of tho cones ante date tho period ot maximum glacial development Is practically certain, but so far us noted they havo not suffered appreciable or at least not Important, glacial erosion; and yet it would bo difficult to find a for mation moro susceptible to rapid cro- Unconformably above tho Mascall . slon. In this field tho two antagon ibods was doposlted in I'lioceno or.lstic agencies, volcanlsm and glacla lato Tertiary tlmo, 100 feet, moro or. Hon, or flro and frost, havo been ac less of water-worn gravel and ovor-(tlvo for an Indefinitely long poriod, lying rhyollto tuff and lava. This tho volcano building up nnd tho glu ts tho Rattlesnake series ot Morrlam Icier wearing down tho faco of tho nnd of its occurrence In the Benham .land. But to tho present tho forces falls district there can bo llttlo. of flro havo greatly predominated doubt. Great Valley Filled. Whether tho stupendous eruptions over those of frost; though it ap pears not imposslblo that with tho gradual extinction of tho volcanic ot tho Cascado volvanoes result In! energy, now so plainly In progress, any part of tho district In lava, cin- tho glacier may yet bo in tho ascend dors or ashes (dust and lapllll) do- ant, at loast this might bo antic! pends upon tho distance from tho patod but for tho obvious fact that vont. Cinders pile up around tho glaciatlon is also on the wane, vent lu stoop cones. Tho ashes aroj Tho chiot Incidents or phases o( spread over areas proportional to tho expiring volcanlsm embraco tho tholr flnonoss and to the force and formation of tho widespread and shift ot tho wind, but attain notablo thick mantlo of pumiceus lapllll or thickness only within modorato dls- comminuted pumico, which, liko a tances, possibly Bcores, but not hun-j snowfall, covers tho face ot tho coun dreds, ot miles from tho vent. Tho try, and tho building of tho latest and In ! still uucroded basaltic flows lava or molten rock, if Issuing sufficient volume, us in the great fls suro oruptions, may, howover espe cially it the topography or surface and cones, tho series ending, for tho tlmo bolni;, with Lava butto and the flow spreading from Its base. This flow gradiont be favorable spread ovor, turned tho Deschutes river ovor tho truly vast uroas, oven many thou sands of square miles, Tho throw of tho great Cascade fault being up to tho west and down to tho cast, tho normal movoment of tho oxtruded lava lias been, to a largo extent, upstream, or, moro ox actly, into a closed basin, accumu lating liko water in a reservoir and attaining its maximum thickness or depth In tho lowest parts of the origi nal valleys, It was thus that in Mlo- rhyollto rldgo, thus inaugurating Benham falls and permitting tho silt ing up of tho broad, shallow basin above tho falls, which bocame there by an Idoal reservoir floor. Con temporaneously, too, with tho de clining volcanlsm and glaclatlou has been tho final canyon cutting accom plished by tho Deschutes and its principal tributaries north of Ben ham falls and, especially, north of Bond. OKscmin'iVH okolooy of thi: 11KNIIAM F.Iil.S 1UKT1UCT Tho llhyollto Dike This nppeurH to ho, on tho wholo( tho best geological designation ot tho hold rock rldgo standing athwart tho Deschutes valley In tho latltudo ot lleuhnm Fulls, nnd to which the river owes this jnost Impressive ot all Its chutes, Tho rldgo raugoH from 100 to possibly 200 foot lu elovntton nbovo tho river; varies lu width, roughly, from one-fourth to throe-fourths ot n mllo; nud has boon traced approximately two miles, from tho vicinity ot tho wost sldo rond to tho point- 2,000 foot east ot tho head ot tho falls whoro tho rhyollto Is seen to pnss under tho Lnvn llutto flow ot basalt. So far. It Is, In its relation to tho val ley, a great natural dam, extending from a point on tho wostern slopo well nbovo any contemplated How lino across moro than half tho prob able breadth ot tho valtoy below that line. Tho river first encounters Iho rhyollto near tho westorn end of tho rldgo; nud, promptly turning to tho eastward, closoly follows Its southern or upstream border to tho margin of tho now lava. I lore, tho abandoned bridge, turns abruptly to tho flowing between tho tho loft nnd tho now lava on tho right for halt a mllo to tho apox of tho marked re entrant nnglo ot tho rldgo, where Its crest descends to tho river lovol nnd tho river escapes ncross tho rldgo, which Is bouudod on tho north by n tone ot basalt tuff rep resenting, no doubt, tho old Colum bia basalt. , Tho rhyollto Is throughout a mas- slvo and wonderfully homogeneous, hard, compact and resistant Igneous formation, which may, probably, best bo regarded as tho plug or neck ot nn anclotit volcano which has long since been removed by erosion. Plnlnly enough, tho rhyo llto is older than both tho nower and tho older basalt flows by which it Is environed nnd nbovo which It rises as a genuine stoptoo. Con cerning tho courso and extent ot tho rhyollto beyond tho cast end ot tho rldgo, or tho lino whoro It dis appears beneath tho Lava Butto flow ot basalt wo can only conjecture; but tho probabilities will bo dls cussd in a later section. The Columbia basalt Is tho great lava formation of tho Columbia plateau, covering continuously and to n vast thickness many thousands and scores of thousands ot square miles. From tho open fissures and craters ot tho Cascades tho highly fluid molten rock was poured out flow after flow, filling tho broad valley ot tho Columbia and cover ing to lessor depths all but tho higher parts ot tho broad summit ot tho Bluo Mountains, layers of volcanic dust and lapllll alternat ing to somo oxtent with tho mas slvo shcots ot columnar basalt. Although formed back In Mlocono time, tho Columbia basalt . shown, outsldo of tho canyons, whore it has felt tho powerful eroslvo action of tho rapid streams, but llttlo evl denco of erosion. Whero not cover ed by soil it Is still hard and black and exhibits tho gently undulating or wavy nurfaco of tho original flow, as woll as tho prismatic Jointing and prcssuro ridges. In fact, It ap pears prohablo that whoro soli Is present It has boon derived chlofly from volcanic dust and lapllll, and not from tho solid lava. Vt'vnt Hide IhiNiilt Newer In tho Benham Falls district, or, moro gonornlly, south of Bond, abovo which tho rlvor and tho Cas cado rango aro slightly dlvorgont northward, tho basalt of tho op posite slopes ot tho valley, tho east slopo and tho wost slopo, is moro or loss distinctly contrasted, especially as regards indications of ago. Tho basalt of tho west slopo has, of courso, boon derived from tho Cas cado rango; whilo that of tho east slopo may most reasonably bo ro ferred to the gigantic Newberry Crater and Its subsidiary vonts with in a radius of ton to fifteen miles, which havo, no doubt, boon moro roccntly actlvo than tho neighbor ing soctlon of tho Cascado, rungo. At nny rate, tho west slopo basalt Is, at all points south of Jlond, do cldedly moro weathored and older- looking than that ot tho cast slopo. Owing to tho moro weathored and decomposed aspect ot tho west sldo basalt, its outcrops aro fowor and loss bold. And slnco it In tho older flow wo may assumo that it oxtendH eastward somewhat in definitely, or without regard to tho wostern limits ot tho newer oast sldo flow. In other words, It ap pears probable thut tho eastern overlaps tho western flow to somo oxtent. And It lu a natural .sug gestion that ovidonco of such over lap may bo affordod by Homo of tho boring pt tho Ilonham Falls area. Tho now boring (1) ut Minor's Cabin or Damslto "A" Is ot special interest lu this connection, slnco it shows, from tho surface down, hard, sound basalt for tho first 05 foot (eastern and newer flow) followed by brown to red, oxldltod nud wonthorod hnsoU (wostern nnd older flow), A similar, lu fact nu almost Identical, record In afforded by Bor ing No, 5 ot tho original Minor's Cabin Horlos, nud, again, by tho boring of tho BronkH-Scnulun Lum ber Company (8), on tho east hIiIu road, u llttlo moro than two miles south-HOUthcaHt ot Minor's Cabin, Here, also, tho drill, after passing through ovor 00 toot of tho hard and comparatively fresh hatialt ot tho eastern flow pouotratod the oxi dized and rotten basalt of tho wost ern flow, and eudod lu It ut a depth ot 100 fot. llhyollto Itlilgo Volcnnlu Node Wo nro, thus, Justinod lu conclud ing that the old, decayed western flow of basalt probably extends nt lonst this tar to tho eastward; nnd this Is far enough to Insure Its un derlying practically tho ontlro area ot tho proposed reservoir, save whero It may hnvo boon removed by tho rlvor In tho development of Its channel. But for this possible exception, wo might, then, nssumo for tho reservoir n continuous sub floor of tho older and, probably, moro Impervious basalt. Whether tho flood ot basalt from olthor sldo over submerged tho transverse rhyollto rldgo, Is vory doubtful. On tho west side ot tho rlvor, north ot Benham Falls rhyo llto tuff Is seen to ho capped with basalt. But tho rhyollto ot tho Ben ham Falls rldgo, with Its vortical flow structure, must bo rognrdod ns a truo volcanic neck. Tho basalt falls fur short ot covering It now; nnd slnco the sharp rldgo of rhyo llto must havo lost elevation by erosion much moro rapidly than tho broad plain of basalt, wo can only coucludo that tho floods ot basalt surged nround tho rhyollto relief but did not ovortop It. Iiivn Tunnel No feature ot tho basalt Is ot greater scientific Interest or prac tical liuportnnco than tho lava tun nel. This exists where after tho main part ot a flow has cooled and solidified, cracking of tho crust al lows tho still molten residuum to cscnpo, and tho tunnel, or a vacant spaco of somo form, naturally ro suits. Whethor or not water or soma other constituent ot tho basalt tending to promote Its liquidity, determines tho location or forma tion ot a tunnel Is nn unsolved problem; but to tho writer It ap pears moro prohablo that tho princi pal factors aro differential cooling, gradient and velocity. Tho Incandescent lava Is cooled and stiffened by contact with tho cool earth below and tho cool air abovo. Botwcon tho two crusts thus determined It flown most rapid ly In tho lines ot highest gradient (most rapid descent). Whom tho gradiont Is low and tho movoment sluggish, as on upland areas, tho lava first solidifies through tho on tlro thickness of tho flow; nud tho moro fluid, rapidly moving portions aro confined moro nnd moro to the vnlloyn or topographic lines of steepest descent. Tho hottest, most fluid and most rapidly flowing lava will bo that freshest from tho crntor or flssuro nnd tho subterranean sources, and when tho Intter finally tall, tho lava within tho tunnol drains away and leaven tho tunnol ompty. Luvn Tunnel Important Tho normal topographic relations of tho lava tunnol nro of special practical Importanco In connection with this study bocuuso of Its tendency to follow tho axis ot tho vulloy as It oxlntod at tho tlmo of tho eruption and tho outpouring ot tho lava, and also bocausa thoro exists In tho Doschutcn valley abovo Ilonham Falls, and thoro In tho pro posed reservoir area, a magnlllcent examplo of tho lava tunnol. Tho ontranco to thtr tunnol Is on tho oast sldo of tho vulloy, about ono and ono-halt mlloB southeast ot tho main road at a point ono mllo south ot Lava Butjo; and probably In Soctlon 35 of Tp. 10 8., II. 11 K. For tho discovery of tho tunnol and for accosH to its Interior wo aro Indebted to a local fall ot tho roof, duo, porhapn, to tho passago of oarthquako vibrations. Tho gonoral courso of tho tunnel is northwest-southeast; but it Is far from straight, winding much us a surfnea stroam of wator might in traversing tho samo territory.' It is said to havo boon travorsod for a mllo southeasterly from tho on tranco; and In company with As sistant Englnoor Irving B, Crosby I travorsed It to a point nearly ono" and a fourth miles northwostorly from tho ontranco, Kroslon Blight. Tho tmnsvorso dimensions of tho tunnel aro fairly uniform say 20 to 30 foot wldo nnd 15 to 25 foot high, disregarding oxtromon;, nnd EDUCATION PAYS l'Olt Till! 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Tho lluor Is sensibly level, trnvo whoro encumbered by sand washed lu through cracks lu thu roof or by rare falls of rock Tho tunnel, however, Is not luvul; but It bus n surprisingly uniform north wostorly gradient, agreeing, approxi mately, with the general slope ot tho ground nbovo It, Toward Iho Inner or northwestern ifntl ot tho tunnel, tho said derived lu part, nt least, from thu roof, becomes moro and moro abundant, ami final ly reaches tho root and closes Iho tunnel, without, however, appreci able contraction of Itn bore. As tho sand gnlim lu depth It npponrs to gain, also, lu moisture, tho ap pearance being, at tho last, that tho tunnel Is Hearing tho water table. Klthor this supposition Is ot tho tunnol. Ono dlfllculty In deriving thu main part or nny largo part, of tho tun nel, sand through tho roof Is Iho truo or tho damp snud conserves with great tenacity tho drip water general tightness of tho tunnel, tho floor nud lateral walls being almost nlmolutely tight, and tho roof ditto, so far as could bo neon by cnudia light. Tho sand Is of very uniform character, entirely free from clay clearly of volcanic origin, nnd Iden tical In chnrnclor with largo vol umes ot sand which Iho drill han shown lo underlie tho Benham Falls reservoir area. To account for Its nbundnut prcsonco In tho lowor part ot tho tuunul wo need only assumo a local collapso of tho tunol roof. Tho tunnel In much newer than tho basalt ot tho western slopo nnd contemporaneous with that ot tho eastern slope, but older than tho gorge which tho river has cut In tho newer and older basalts, nnd older still than tho volcanic and organic scdlmonts deposited In this gorge and over tho general floor of Iho Bcnhnm Falls basin and tho prospective reservoir. Tunnel's Cotirno Nought Wo aro, naturally, specially con cerned to discover, If posslblo, Ilia probable courso or thu lava tunnel bononth tho reservoir area nud Its relation to tho burled gorge of tho Deschutes river, Tho snfost as sumption In Hint, an previously Indi cated, thu tunnel follows tho steep est nnd deepest lino of flow of tho east side basalt. This would bring It to and Into tho undent gorge of tho Deschutes river nt or nbovo tho point whero Iho Deschutes or that tlmo cut through tho rhyollto ridge. That tho statin pressure nud tho high liquidity ot tho column of lava would maintain the discharge to tho point of exhaustion, nud finally leave the tunnol empty, Is most probable; for the loan of heat sustained by Iho lava lu Its passago through the tuunul would ho Inconsiderable; nnd lava suftlcleiilly fluid lo enter tho tunnel would bo likely to complete tho passage. This Is (ho conserva tive view nnd certainly accords with the present stnto of the tunnol, especially with Itn rogulnr form and smooth walls. It Is a perfect con duit, of ample bore and well forti fied against loss of bent; but be coming, an It slowly cooln, nu Ideal channel of n subterranean river. It does not appear, however, to hnvo been occupied, even temporar ily, by a stream of water, nt least not In tho part now accessible, for wo detected not tho slightest trace or Indication of stream erosion, or deposition; oven tho sand with which the tunnel Is finally clogged hnvlng moro tho appearance of hav ing boon deposited by drip wator than by running water. Tho tunnel Is not only nn Im portant contemporaneous structural feature of tho great east sldo flow ot basalt; but It In probably through out, nud not ntono whoro tho root has fallen, n comparatively shallow feature; for this sheet of basalt has not been covered, along Iho proh ablo lino ot tho tunnel, by nny later formation, save, perhaps, tho flood plain deposit (silt, etc.) of tho (Continued on Pago 7.) f9W9999S9339J39J!fJ3 BUCKHECHT iHOES tho root rangos from 20 to 40 toot In thickness. 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