Page:1922 Bretz Notebook.pdf/3

IF NOT A LAKE TO THE NORTH, AT LEAST THERE SEEMS TO BE EVIDENCE OF DISCHARGENG GLACIAL WATERS. THE FRESHNESS OF THE BLDRS INDICATES THAT THE DISCHARGE WAS ?? HEA#13 2038 MABATE SOM YUTHERANNA SOILS AND TOPOGRAPHY CUER TA AONET 108 310 HT MANE Je ENOU GHT KE 038 MICA TO BELLO AUG 2 AT MICA THE ENTIRE HILL WEST OF TOWN IS COMPOSED OF GRANITIC WASTE. JAY THICKNESS MUST EXCEED 100 FT.. THE WASTE IS STRATIFIED, SOME STRATA ALMOST PURE KADLIN SHITE CLAY, SOME A FINE GRAVEL OF QTZ, FLDSPR AND MUSCOVITE, A COARSE ARKOSE. APPARENTLY THIS HLLL HAS BEEN THE SITE OF A LOWLAND OF THE OLD GRANITE LAND, PERHAPS PRE-BASALT. FOSSIL LEAVES FOUND IN THE CLAY. AT FREEMAN, THE SAME SITUATION IN A BIG PIT BOR CLAY, 50 ET DEEP. EXCEPT THAT STRATIFI- CATION ISNT VERY DEFINITE AND NO COARSE ARKOSE PRESENT. NORA GHT BOSH 100A JATRAV IN SEVERAL CUTS BETWEEN FREEMAN AND BELL, PLENTY OF ANGULAR QTZITE WAS FOUND IN THE GRANITIC WASTE. ALL SIZES OF FRAGMENTS, NOT TRANSPORTED BUT PRODUCED BY WEATHERING ON THE PRESENT TOW SLOPES. DEEPLY STAINED. NO OUTCROPS OF QTZITE FOUND BUT IT MUST BE PRESENT BENEATH. HOOR O PALOUSE LOESSIAL SOIL FOUND OVERLYING THE GRANITE WASTE AND, SOUTH OF BELL, OVERLYING BASALT APPARENTLY NOT RELATED CLOSELY TO UNDERLYING FORMACIONS NO GRADATION BETWEEN BASALT AND SOIL SEEN BETWEEN BELL AND ROCKFORD.) BASALT ISNT DEEPLY DECAYED. ON SLOPES AND IN VALLEY BOTTOMS, PLENTY OF BASALTIC RUBBLE AND EVEN LEDGES EXPOSED. T T-0831.10.om NOW EX OWT VALLEY OF MICA CREEK FROM VICINITY OF BELL SOUTH TO ROCKFORD IS CLEARLY ENTRENCHED BELOW THE SURROUNDING M TURE TOPOGRAPHY AND CLEARLY MUCH YOUNGER. THIS DOES NOT SHOW WELL ON THE MAP (100 FT INTERVAL) BUT IS PROMINENT TO THE OBSERVER IN THE FIELD. BELOW ROCKFORD, IT IS SHOWN WELL ON THE MAP..TODA 83T OT ASAS 3T 90 3T 40 TIMER 28180230 35 HOU 2TM OHAO 3MT 30 834008 A38OJ SHT 41424343 HT 300 JOHADT I TEATUDS ROCKFORD TO TEKOA AUG. 3 OMA BY TOT MOD AVERAGE A DIVIDE RISING TO 2950+ RUNS NORTH FROM THE TEKOA MT MASS ALMOST TO ROCKFORD. SUMMIT OF BASALT HILLS 2500-2600ATHESE HILLS PROBABLY NOT BASALT BUT NO ROCK SEEN IN TRAVERSE ACROSS. VERY MATURE TOPOGRAPHY OF DRAINAGE LINES SOUTH OF ROCKFORD, ABOUT FIRRFIELD AND ON ALL SIDES OF TEKOA MTS. QUITE IN CONTRAST WITH THE ROCK CREEK AND MICA CREEK VALLEYS AT ROCKFORD. ALSO NOTABLY IN CONTRAST WITH SLOPES OF TEKBA MTN. 23011312 3HT 18 NO SLATY STRUCTURE IN ARGILLITE. TEKOA MTN. COMPOSED OF TILTED ARGILLITE AND QTZITE. ORIGINAL SEDIMENTARY STRUCTURES, LIKE RIPPLE MARX, LAMINATIONS, ETC., STILL VERY DEFINITE. MUCH JOINTED, HOWEVER. NO LEDGES OF ROCK ON THE MTN. BUT SLOPES AS STEEP AS THE LOOSE MATERIAL WILL MANNTAIN. MTN HAS ONLY A SAKK SMALL PIEDMONT WASTE SLOPE FLANKING IT, AND GENERAL EFFECT IS- THAT OF AN ABRUPT RISE OUT OF THE BASALT COUNTRY.. BASALT IN SITU FOUND WITHIN HALF A MILE OF OX3 J108 T NO TRACE OF THE BASE AT TEKOA. QUARRIES IN BASALT HERE AT BOTTOM OF LATAH CREEK VALLEY. WengX3 PROBABLY THE SMALL WASTE SLOPES BASALT EVER HAVING BEEN HIGHER ON FLANKS OF TEKOA THAN NOW. IF PRESENT, THIS OF THE MTN. SPREAD OUT ON THE BORDERING BASALT, THO THIS WASNT DEMONSTRATED. RELATIONSHIP WOULD IMPLY THE FOLLOWING TEKOA AT TNBEF OF BASALT FLOWS WAS ARRECIPITOUS 29834 ROCK-WALLED MTN. VERY YOUTHFUL IN SLOPES. VI THESE HAVE SOFTENED AND THE SLOPES BECOME WASTE- ELISYO COVERED WHILE THE BASALT HAS BONE THRU YOUTH TO MATURITY. AT THIS SEEMS PECULIAR, FOR HIGHER LESS WATER RUNS OVER STEEPER SLOPES SHOULD BE ERODED MORE RAPIDLY THAN LOWER FLATTER SLOPES. SVOBA S THESE HOWEVER. DAVIS, IN ANALSIS OF EROSION CYCLE, NOTES THAT MOST RAPID CONSUMPTION OF UPLANDS IS IN LATE MATURITY. HOYA 36 00 BWIRAWAT S