Show CE LEFT BY EARLY lAKE Pack Describes Utah of Thousands of Years Ago Evidence of the to ancient ancient lake lak JIM hat covered an area of ot 2000 square miles and was WC In excess o of 1000 feet deep is to bo be seen loeen everywhere e In tho the Great said Professor Frederick J J. J Pack Tack of 01 the University of ot Utah geological department In his Ice turo ture Thursday evening e In la the Cen Cen- Central Junior auditorium call this prehistoric bod body of ot water Lake Lako Bonneville It Ita way was in existence up to about 2500 years cars ago 0 It first came camo Into ex ex- existence about half halt a million years ago but this Is only oDly a n mere mero frac frac- fraction I non tion of ot time relatively speaking for the earths earth's sage ag since living forms forma began Is conservatively given s at million years Figurative Lake I Bonneville was only yester ester day The climate be betro ire re Bonneville times was wall arid This we YO know lwow bi bithe b the coloring of ot the rocks rock of ot that tha period and ho hu size of ot the tho boulders boulder laid lard down In old stream debris ISS I Then occurred one of ot the tho mira- mira miracles des c of nature to which we ha hav hano have no clue cille Very cry slowly ly the the changed to ai a humid 1 one with much ral rat I M and vegetation Cen Century Century tury after the century century the the tion increased and the he temp decreased deceased Why It was we do no know It is one of the th great m mys ms 8 and more moro than any other I J should like I t solve this one Dur Dut DurIng DurIns Ing Ins this t pet pei oj of tropical semi plants plant grew grow as far north as the Arctic circle but the change came cami- very verv slowly during durang thoi thol f t year This Thill period was followed bv by another climatic change when n a polar Ice sheet spread down across acro the earth almost to the equator The brackish marshes of or west western ern America Amerl from tram salt to fresh Lake Lako Bonneville covered cov red all western Utah even into Inlo Nevada l south couth below Modena east to the Uc Wasatch mountains and north to Idaho cr the lakes lake's waters re remained re- re remained mame 1 stationary for any an length o q Q time the waves wa would beat against tho the sea cliffs and terraces would be At one spot on the edge f the Oquirrh mountains there there're ire le 19 distinct terraces Wo Vo know that the prevailing winds of ot that time came from tram tho Northwest because be ause tin thi th 1 best ter ter- terraces terraces races are arc en on the tho southeast shores of ot each ach gravels s carried I Ithe liv lov littoral currents also Indicate the trend of the winds The Tho highest terrace Is the so so- rolled Donneville and the next majar ma major jor jar one below Is the Provo and the lowest one Is the NEAR NEAIl OLDEN I The Tho sand ridge west of 01 Ogden was al formed by the delta of ot the Weber river rl which poured pound Ihlo the lake Inke The Tho residential bench of oC Ogden Is the old delta of ot the Og Off Ogden den river terminating at Wash Vash Washington ington avenue a When the lake lake- waters sitters were at nt atthe atthe the Bonneville terrace terr ce for tor a a. long period of time the tho waves eS cut through feet of or solid quartz lie Itc This evidence Is clearly vs vs- s. s East ast of 01 your city A sudden increase e In raised ra 1 the tho water above the thi- 1000 level marly marl and they found an outlet pouring over o er life e north end Ond of ot Cache Cacho vatic valley all f. f In 10 miles s north of where the town toWn- of ot Oxford now no stands They fed down past p st Inkom Joined the Portneuf riv river er er cr thence into the Snake the Co Columbia i lumbia and the Pacific ocean ocran The water cut a channel half halt a mile mil wide Ide through loose gravels until the lake lak had been lowered four hundred feet Then a n hard silo sill of ot limestone was encountered and as ns the lake water wafer was without it could not cut through this rock The old course of the water l is I Inow isnow now now- marked by b marshes and swamps In to Marsh valley and at Swan Lake Ilke Utah The Oregon Ore on Short Line railroad 1 now uses the old outlet for tor It Its Ite tracks going from here to lo 10 r Less Les precipitation finally brought the th lake down another feet where It remained remained- a long longtime longtime time and then greater aridity low lowBred Bred the waters still sUIl more to the th present Great Salt lake a a. mere remnant of Its lit vast ast predecessor or orThe The Tho evaporation e left lert the waters tv catty LAKES y CAUSED tSI C D. D A U gravel bar made by Bonne Donne 1110 shore currents at the Jordan Narrows caused Utah Lake in T. T lah valley and a similar one be between tween Tooele and Rush valley vall formed Rush Hush lake Professor Pack J ak spoke bristle on 1 tho the landslide that Ilat caused the Ule Groc Ventre entre natural dam which was washed out recently r destroying th the town of or Kelly Wyo Wo lie He said ald landslides are arc not un uncommon uncommon i common more than a n. dozen oc occurring oc- oc occurring I along the th mountainsides s between n here and on Nephi l mill mile south He fie attributed the cause of or orthe I the tho Gros Groll Ventre slide Illde In the sum sum- summer summer summer mer of 01 1925 t to 16 6 excessive moisture which had saturated the ing strain strata and an anc allowed a the moun moun- mountain tain tali to slip Into the canon can on damming lain dam lIn minI ming the stream with a n. mass of dirt and lInd rocks a mile mill thick at th th base High water this year par evl evi- evidently dently found a loose section and an cut through the th barn bar bare he hI said 2 r I. the ibo 1 l lake Pro sor Park departed d for forC Cedar Codar C City after the cIa lo-e lo 1 of th the lecture He lie will return during th week Next Nest Thursday Thur da danl night nl ht the final lecture in the course will be bl given given en n The rhe topic will be Occurrences Occurrence ot of Petroleum in Utah ron role fIELD IU TRIP A At 1 field ld trip to t Little Cottonwood canyon conon will conducted be by Pro Iro Professor fessor Pack on Saturday May M y 25 All those e In ing ng to go arc asks aski- to meet at It the Hotel DI low ai am 8 3 o'clock t t t morning Shortly after 9 o'clock the party will re reo reassemble reassemble assemble at nt the Hotel Utah lu in II Salt Lake Lako where a group of ot Salt Sal 8 will Jr jc j s with th the O- O Ogden n fits and from front there the entire par par- party party ty will Journey tr en canyon Aft Art After Arter Aften er en studying glacial moraines step slop 51 1 faulting graben s faulting rock folding Lake lle Bonneville Bonne terrace water worn can canon ons ice worn can yom pons gl eal al d d.- d. debris rl stream tream depo its and other geological features In inthe tho the vicinity the group will return to Salt Sail Lake about aboul o'clock in n the tho evening A photographer photo wi I Ibe be bo present to take tak pictures of 01 th lh trip Prote or F. F W. W Reynolds of 01 th university c tension r division an announced flounced that at the close ct ef th th- course an examination would wO be bf given for those who wished to la take talle It to secure two college collego cre hours hourI sours The examination will be bein bein in charge chiro of ot Francis Wiggins prin principal cipal o 01 Ogden s eu City part time school The time and place will be announced later Arrangements art aro being made mode to conduct a Il tour for foe those who de desire desire desire sire to visit the scenic mIC wonders o 0 southern Utah Professor Reynolds said that a Q day 10 1 tour could coul 1 be arranged for tor about Jus per r per son con this would include all ex ex- exI expenses I pensel of ot traveling steals meals and an lodging I I |