Oakland Tribune from Oakland, California • 18

-A rv ay Cj Li I. A few specimens of free gold Vista and hollows at the Mira Golf Course in El Cerrito. 0 0 0 ANCIENT VALLEYS Ris ing sea level at the end of the ice ages "drowned'Vthe valley. The Bay Area is a tumbled museum collection of the earth's history. In some parts of the hills a single step carries a man from "recent" times, when mammoths roamed the region, into the era of ancient volcanoes on the ocean floor.

Some places to visit: VOLCANIC MUD FLOW On Grizzly Peak Boulevard. 0.6 of a of San Franei3C0Eay ana the lower creek channels. The val offset and the apparent epl- center of the 15CS quake occurred near Olema, Maria County, near a spot on High-- way 1, one-tenth of a mile north1 of intersection with Sir Francis Drake Highway. West side of the; fault moved 20 feet north in: relation to east side. Rupture went through front yard of ranch house, offsetting the walk-: way 20 feet but doing little dam-; age to the house.

Twenty miles: away, where the shock wave; vibrated at different frequen-; leys filled with soft mud which man turned into dry land by filling. In these areas even well constructed roads and buildings have been found in Coyote Creek Canyon near Saa Jose, 7' SIEIIRA NEVADA ROCKS-Blue rocks, a volcanic debris unlike any other 'sedimentary rocks found in the Bay Area, can be seen in road cuts along Highway 50 1.7 miles southwest of Mountain House In eastern Alameda County The volcanic material was apparently carried from the Sierra into a shallow sea. It is interbeded between steeply dipping strata of cretaceous sandstone and shale (75-130 million years old) and less steeply dipping beds of mio-cene. sandstone (9-28 million years old). State's geologic can subside and crack uneven mile northeast of Claremont Ave ly.

Examples can be seen at the Bay Bridge Toll Plaza Road, sitting above a 90-foot-ueep val farm irrigation diversions has reduced river outflow so that silt new falls but in Suisun Bay and near Antioch except during heavy flood Best view of the new islands is seen at low tide. 0 0 0 ANCIENT LAKE BED A section along Highway 24 starting 0.8 of a mile east of the Caldecott Tunnel shows remains of an ancient lake, the "Siesta" Formation" of Siesta Valley. Brightly colored rocks and soil on either side are the older "Moraga Volcainics" lava flows. Lake originally sat on top of lava flows, but earth bending lifted volcanic rocks on both sides leaving the softer lake-bottom deposits in a bowl of harder volcanic material A cross section of all rock strata between Lake Temescal and Orinda Crossroads along High way 24 can be found in State Division of Mines and Geology Bay Area Guidebook. 00 0 i SINKING LAND The Santa ley, where road subsided almost cies, tne village or sama Kosa 10 feet in 20 years.

Effect can was almost totally destroyed. also be seen in rafters of Oak land Auditorium which straddles an ancient, 75-foot deep steep- Government monuments have been erected next to road at Olema to record future move-; ment, but this area has been almost completely free of walled canyon. Areas of Alameda near Posey Tube and Nav al Air Station sit on 100-foot-deep canyon, making it difficult and expensive for large buildings to guidebook says beds are blue "because of a thin glaze of blue opal that surrounds each pebble and sand grain." be constructed despite numer-our proposals presented to Ala quakes -since -1906. North of Olema on Highway 1 the 1906 rupture line is marked by clear-" ly seen landslides, sunken areas and a fairly well designed trench. nue intersection.

Mud boiling out of a swampy lake area volcano carried cobbles and boulders of darker lava. The darker lava was hurled up as "volcanic bombs" and "froze" in mid-air, giving it a smooth shape. Both the mud flow, which erodes easily, and the frozen bombs can be seen in road cut. SAG PONDS Sometimes the hearth sags like a broken floor board due to earth movements near fault lines. These hollows fill with water during the rainy season and are often modified by farmers for cattle watering ponds or become sites of city reservoirs.

Crystal Springs Reservoir, along the San Andreas Fault in San Mateo County, San Francisco's main reservoir, is an example of such a pond. Local sag ponds include Lake Aliso at Mills College, the pond at the city owned Dunsmuir House property in East Oakland, or the numerous ponds 0 0 0 1SIJ EARTHQUAKE EPI meda City Council and City CENTER The largest known Planning Commission. 0 0 NEW ISLANDS New Islands Clara Valley is sinking due to the extraction of ground water which have appeared in Suisun Bay in past five years can be seen east of the Martinez-Be- under the valley. At Alum Rock Park east of San Jose the subsidence can be seen along line (ft nicia Highway Bridge. Fresh water silt from Sacramento-San Joaquin- River system "falls of the Hayward Fault, accord ing to U.S.

Coast and Geodetic out" when fresh water meets lucsntMcsMiJ- ALWAYS FIRST QUALITY Survey, Park gets its name from salt water. Silt used to be de the potassium alum which cov posited in San Pablo Bay, but continued building of dams and ers some of the older volcanic rocks. The alum was deposited At ell Gey Area Sfcrcs! on rocks by ground water seep ing from other areas, A huge Why McKillop Road Homes MUDFLOW Volcanic eruptions In ject is a cigarette lighter. Note how shallow sea and lake areas set off ancient mud "weathers1', and erodes volcanic mudflows seen in many parts exposing smooth, hard rocks trapped of Oakland and Richmond hills. This in the mudflow, Many of the smooth one is seen in.

road cut on Grizzly rocks were pure lava which "froze" Peak Blvd. 0.6 mile northeast of Clare- into water drop when they mont Avenue Intersection. Shiny were hurled out of the volcano. boulder of rare manganese minerals was uncovered in a landslide at the park, but the Were Destroyed by Slide source of the boulder was never located despite search by nu For hundreds of years the merous geologists and mineral- face of the hill bad been creep ologists. rected, but it would cost at least $1 million.

It would require taking more property than was involved in the slide area and rerouting of Sausal Creek out of ing downhill In Sausal Creek. Ring of Fire 0 0 Ot GOLD Small amounts of Nobody paid attention until gold have occasionally been Dimond Canyon. ound in the Eastbay hills, but the city carved McKillop Road and Sheffield Avenue near the crest and people built homes. the terrain is so fractured min ing was never profitable. Small Reshaping The Earth -Then McKillop Road started amove.

Bonus Clue Gradually, 15 homes were de amounts of gold in thin quartz veins were found near Summit Reservoir and on Keith Avenue in Berkeley. Traces of gold and silver turned up on Mountain Boulevard near Mills College. stroyed or moved. The street fell into a gaping hole. Earl M.

Buckingham, super vising civil engineer for the city of Oakland, said a reservoir was Continued From Page IS California geologists usually end up using water to Illustrate the rapid changes In the landscape. The Salton Sea in Imperial and Riverside counties was created In 1902. Tulare Lake, near Bakersfield, described ty 1900 encyclopedias as the largest carved Into the hilltop In 1909 and excavated material used Don't Ignore Safety To View Treasures The Bay Area is a treasure box of geologic wonders but the person who examines them shouldn't invade private property without permission or try 60 mile per hour rubbernecking that could endanger the lives of others on a highway. I Most geologists develop strong legs by walking. A person should park well off the highway, preferably on a side road if he wants to examine rock formations exposed in a highway cut.

Many interesting formations are in cliff-like areas which could be dangerous to young children. -A person-can get more outof a trip if he knows what he's looking for in advance. A good place to start is the State Division of Mines and Geology library at the Ferry Building In San Francisco. It has a number of Inexpensive tour books, maps and detailed studies for sale. The U.S.

Geological Survey, 555 Battery St, San Francisco, also has inexpensive maps and various "open file" -publications which can be reproduced with a few days advance notice. fill on parts of the southern hillside. The streets were put in in 1928. body of fresh water west the I HQ2B THAN I A -'I I REALLY hLI (i I a. "i 1 I 1 0 I 'Ml I -Ml I i if r'j A I ESOACCAJTS AND ffl fCI RECEIVES OVER A Hi ti RANGE OF 13 MILE A layer of loose soil sloped Great Lakes, dried up In 1S24 and Is now th site of many $200000 SALVAGE VAHEIfOUSE SALVAGE CLEARANCE FAMOUS NAME ERANDS CRCXE KRQOUX3 LANE BASSET RCA CEXTURY SEALY RIGID AIRE, ETC "NoEeasonable Offer Refused" SEVERAL HUNDRED TKCUSAK3 DOLLAR STOCK bcMlaf fnmi km km fw.lrti.,1, urn ffUmm, flfenra, tal.

litwa, fmltm, Wil4if tfotpMrt ni rimna tlrttMrt liffei, SAVE up to and MORE! or mm noon to utuidat, to daily to into Sausal Creek. The loose soil sits on an almost level layer towns of "sensitive sflty clay" which sits below the creek level and Half of the glaciers in the Sierra Nevada have vanished in this century. Hie mighty Colo rado River flow that carved the Grand Canyon has been reduced is therefore saturated by ground water. Buckingham said the slide was always moving on this saturated clay. Buckingham said the McKil by one-third since 1923.

The San Joaquin Valley is sub IMMInMIiIn, Jvst Itartfc Itrkvby ItCCRUTO siding so fast that a bridge crossing the Delta Mendota Ca lop Slide problem could be cor nal was almost under water ten years after construction. Delta land between Stockton and Antioch is subsiding one foot every four years. Downtown San Jose Is sulking almost a fool a year. Parts of the city of Long THE ORGAN THArS DESIGNED WITH YOUNG HOMES MJ lllmilllifl IN MIND Beach sank 30 feet in less than Thinking 1 hero's only Ono Organ to Consider is a 30 years, almost inundating the city lowlands under the Pacific Ocean. Clear Lake, in Lake County, is possibly only a few centuries old.

It was created by a huge irOSTAEIO! landslide that blocked a river that drained into the Pacific Ocean, creating a water filled valley that now drains eastward into the Sacramento River. As you will know when you see the new 1 11 The Almaden Winery, south of Hollister, swaddles a mysterious KimBa "creep zone" on the San Fault. Irrigation ditches and recently planted rows Pennoy's -Traiislsfor vines are visibly offset Two previous winery buildings have ITS FIRST HOME ORGAN WAS MADE IN 1S63! OYER 750,033 ORGANS PRODUCED! (More than any other collapsed since 1330 and the slow Rtsnufacturer.) THE CMY ORGAN GUARANTEED FOR LIFE! destruction of the third building constructed on the spot a sive stone structure is being charted by Oakland seismologist Now avallobU ot an UNBELIEVABLE PRICE becaoio of tho nw cabinet itylts coming out ntxt month, waiter C. Marlon. The border between the United States and Mexico had to be resurveyed after the 1940 Imperial County quake shifted BEFORE YOU DUY YOU MUST SEE KIM3ALL TbOAPJBUVofiliaYIAEl! tne eartft 19 feet.

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