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The Catalina Islander
Avalon, California
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April 15, 1937     The Catalina Islander
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April 15, 1937
 

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L 15, 1937 PAGE FIVE Geology of Santa Calalina Island By William Sidney Tangier Smith los(led by the California Academy of Sciences, February, 1897 from last week) On the northern coast of this part of the island the dip, so far as ob- 'ite is a white, umchserved, is northerly, and varies con- it is possible that sutera~ly m amount, the average lying dike of consider- between 25" and 50~. A characteristic an intrusive sheet, and section ot the bedding is shown in a to the main occurrence view of the shore at the north end of any rate it is in some me beach of Cherry Valley, the sec- the porphyrite as it ond small bay to the uorth of lsthrnus Within the area just Cove. pOrphyrite outcrops at One other point, at !Oek is to all appear- (.the main area. The ~mt of the island is .greenish porphyrite :!de, which also cuts rite mentioned above. between Pebbly :renlity of the island at the base of partly made up of -'r nlasses of a con- the breccia in 'lhe quartzites are nearly every- where intersected by uunlerous veins of secondary quartz, usually of small saze anti rulming in various directions. In places, however, these veins attain a w,dtia of a toot or more, At a nmn- her (of points some of the veins con- tam a small percentage of mineral ores. fhe quartzite is usually bedded in thin anO more or less irregular sheets. They range fronl a fraction of an inch to two or three inches in thickness, averaging perhaps half an inch. These ~~:~.':~~~.~~.~.. : ., LADLES LET US HELP YOU WITH YOUR SPRING HOUSECLEANING PROBLEMS LAUNDRY AND DRY CLEANING SERVICE Efleetlve April 15. Through l lay ANY $5.00 WORTH OF THESE SERVICES FOR $ .10 (includes) RUGS -- -- DRAPES -- -- CURTAINS --- -- QUILTS --- BEDSPREADS -- -- PILLOWS -- -- Call 32 or 105 Our Salesman Will Cheerfully Hell) You You Save BLANKETS ETC. it is composed, sheets are usually separated by part- ~ntly fallen from theings of a dark earthy character, vary-~~. -- : " " : ..... :: :." "~gffg~NH~'i~k~~,~ ugh II~.) rounded ma- ing in thickness ironl the thinnest }ere seen in place byfihn to about a quarter of an inch. In ~ ACME CAFE | ar as o,bserved, these the more thinly bedded quartzite these m l~Osed of water-worn partings are frequently thicker than 3O6 Crescent Ave. | ~[kles, hnbeddedhla the quartzitc sheets. "~ Sp "IS dyD" &50 | eonlpact, greenish Macroscopic Characters--The quart-ecla un a tuner 60c c cut shows a nlarked zite is occasionally nlilkv white; usu- dilute acid', and un- ally, however, as seen with a lens, it;~~." "2"'7 ": ..... " :~tI~~ ..... 'I it is seen to be appears colorless and glassy. Rarely ge part of angular it is found black, while here and there ~$~i~WWi~N~u~$~$i$~i$H~u~$~u~u~u~$~u~1~u~N~$$$$$$$$$~$~[[~uiiu !tz and quartzite, init occurs with a tinge of pink, or even ~ NOW D01NG OUR OWN CLEANING 2ch is largely calcite, considerably reddened, owing to the ons were seen, close- presence of minute garnets, either . porphyrite in ap- scattered through the, sheet or ar- ltaining porphyriteranged in bands parallel to the be(t- altered by (tecom- ding. Many of these quartzite sheets~_ AT OUR OWN PLANT IN AVALON 011S nlade were too Conchlsively the r.e- cecil to the main body and to tile andesite, evidence points to being older than SERIES. area the rocks of the Cover a little more qand. Thev consist 21tes and in{ca-schists, er areas o.f talc- and and serpentine. chiste, besides their found in the area Middle Ranch !as of the basenlent he porphyrite area are in part of with sonic is also found the west end, to- rn Coast, ]3esides the da slnaller patch was ge to the south of tnon, and auother not relne northwestern A patch of garnet just to the west andesite region )or region. OCCurs distinctly bed- it was possible ob- and strike were ese were insufficient ement with regard In many places lye no real indication tp and strike of the ~cal folding with mi- !.to occasional fault- rison of the various Ver, the westerll appears to have re. \Vhether this is Stun to the southeast not be stated. ff section showing cation is seen on ,st of the west end, ag is distinctly visible Our nliles along the greater part of the the beds is quite minor beds and w intricate folding dip ranges from E., at an angle to about 30. appear to be wholly free froln nlica, the surface of the sheet glistening from the minute quartz crystals conl- posing the rock. Other speeinlens, in cross-section, appear to be of clear quartz, but when viewed in the plane of the bedding numerous nlinute scales of muscovite are seen scattered over the surface. In all fractured surfaces these tlakes are seen to be arranged with their planes parallel to the p,alm of the bedding. 'lhere are all grada- tions between this and specimens in which the mica is the most prominent mi~ral. The layers which fornl the partings of the quartzite beds are quite dark, varying from a dark gray to a yellow- ish or reddish color due to iron stain. They are finely schistose and readily /lake off; are quite soft and have usually a smooth, silvery surface. Even where this silvery luster is not at first apparent it may easily be made out with a lens. The layers appe:~ to be conlposed of mica or its decomposition products. Tested chemically the nlin- eral shows the pre~ence of a large aulount of alumina, a little iron, no lime anti a little magnesia, besides giving a decided flame reaction for potassium. T'he optical characters of the flakes eouhl not be determined, owing to their want cd transparency. A ctmSl(lerable prot,orti~,n of the rocks of the west end have much the appearance of gray sandstone to the unaided eye, though with a lens they are seen to be composed largely of this micaeeous material, with minute lenses or grains of the quartzite scat- tered through it. These nlicaschists occur indiscrinlinately with the rt~cks which are more properly quartzites, and occasionally lens-shaped masses of the quartzite are found in such areas. There are all gradations be- tween these rocks in which the mica is predonfinant and those in uhich the quartz predominates. Besides the micaccous partings of the quartzites there were found at a number of points 1)artings of blue anl- phib~de, having frequently a silky lus- ter. This amphibole also occu'rs in larger nlasses in a schistose condition. The ~mcurrences of this rock were not mapped, but they are found particn- larlv in the Little Harbor region, ap- par['ntly confined to the neighborhood of tile areas of the amphibole and (Continued on page 8, col. 4) W Special attention given to Fine Silks and Li~,ens--All ironed by hand "A BOOST WILL HELP" ONE DAY SERVICE IF DESIRED In at 9 a.m.---0ut by 5 p.m. 115 Phone 51arilla 60 [ ~~~~~~~~~~~~~~~~~~[~~~~~~~~~~~$~~~~~~~~~~~~~~$~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~i~~~~u~~~~ui~~H~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~m~~~~$~u~~~~~~~~~~~~~~~~~~~~~~~~~~~~$~$[~~[~~~~[~~~~~~~~~~[[~~~fill~~~~[~~~~~~~~~~~~~~[ PHONE AVALON 161 PHONE RICHMOND 6171 AVALON, CALIF. 1719 SO. FLOWER ST. LOS ANGELES RAY C. WALL, REPRESENTATIVE OF OVERHOLTZER, Inc. FUNERAL DIRECTOR SUBSCRIBE NO-WiHE ISLANDER "'UNIVERSAL Tarpon Tuna Deep Sea or Ocean Reel FOR SALE BY H. D. MacRAE COMPANY, AVALON, CATALINA ISLAND NEW YORK HARDWARE TRADING CO., Los Angeles, ~alifornia Or any other Dealer, or Direct from the Manufacturer vonl 92 FULTON STREET, NEW YORK The Largest Manufacturer of Hand-Made Rods, Reels and Tackle of Every Description in America Catalog No. 15~172 Pages--~n Request Bstablished !~$7