IC14. Geology of the Baraboo District, Wisconsin: A description and ...

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Cambrian conglomerate and sandstone, and a half mile north of L along the roadside, glaciated basal conglomerate also is well ex- posed. At Supplementary Stop M, the strike of the quartzite can be followed around the east-closing and west-plunging hinge of the syncline. The surface of the quartzite has potholes, some of which contain indurated quartz sandstone of lower Paleozoic type. 91.2 Junction with Interstate 90/94. Proceed onto the Interstate - east bound for 27 miles. Where 1-90 and 1-94 split just east of Madison, follow 1-94 east-bound to Milwaukee (75 miles). For the first two-thirds of the Madison-Milwaukee route we cross typical rolling, glaciated terrain consisting chiefly of ground moraine, drumlins, and swamps. This entire region was traversed by the Late Wisconsinan (Cary) Green Bay ice lobe, which moved south-westward across eastern Wisconsin. The terminal moraine at Baraboo and west of Madison formed along its western margin. About 25 miles west of Milwaukee, we cross the Kettle Interlobate Moraine. The Kettle Moraine State Forest to the north is proposed to be included in the Ice Age National Scientific Reserve. This moraine formed between the Green Bay ice lobe on the west and the Lake Michigan lobe on the east. Milwaukee itself lies on the slightly younger Lake Border and Valderan moraines and glacial lake deposits. Silurian and Devonian dolomites, which dip gently eastward toward the Michigan Basin, underlie those deposits. End of Second Day Road Log. We hope that you have a pleasant and stimulating stay in Milwaukee.
GUIDE TO SUPPLEMENTARY STOPS (Dalziel and Dott) SUPPLEMENTARY STOP A -- Lower Narrows - West Side Locat ion: SW~, Sec. 23, T.l2N, R.7E; North Range immediately west of Wisconsin Highway 33. Access : From Wisconsin Highway 33 turn north along County U at the bridge over the Baraboo River (see Road Log, First Day, Mileage 41.6). Drive 0.1 mile on U and turn left along an unnamed gravel road. Park at the first fence line on the left (0.3 mile west of County U). The farmer who owns the field, and from whom permission to enter should be obtained, lives in the house on the southwest corner of the junction of County U with the gravel road. Go south along the fence line and continue south up the shoulder of the North Range. Features to be Seen: A short distance below the summit of the range you will reach a slight depression where sheared rhyolite and quartzite are -- seen in situ within 5 or 6 yards of each other. Both dip steeply north here. There is a pebbly zone at the base of the quartzite, but no pronounced basal conglomerate, and no obvious rhyolite pebbles. Continue over the crest of the spur and skirt south round the embayment in the North Range overlooking the Narrows. The bedding in the quartzite is near vertical and flat lying S1' cleavage is prominent. Locally it can be seen to steepen into north-dipping cleavage (S1) in thin phyllitic bands. Large quartz veins are common. At the top of the range there is a thin veneer of Cambrian conglomerate with rounded boulders up to six feet in diameter. Again the present topography closely approximates that of the Early Cambrian. At a point on top of the next eastward spur on the range there is a long, low, outcrop where a structural situation essentially similar to that seen at Van Rise Rock (Cover photo and Fig. 23, see STOP 2) can be observed (see Fig. 191, thus helping to prove that the latter is in place. (The best way to find this locality is perhaps to climb to the top of the spur from the floor of the Lower Narrows twenty yards south of the fence line at the point where Wisconsin Highway 33 converges with the western wall of the Narrows). Please do not hammer this!
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GEOLOGY OF THE BAMBOO DISTRICT, WIS
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ILLUSTRATIONS Cover. Stanley A. Tyl
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Figure 43. 44. 45. 46. 47. 48. Map
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FOREWORD For more than half a centu
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(Dalziel and Dott) Regional Geologi
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The most comprehensive account of t
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the obvious terminal moraine loopin
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TABLE 2: Rubidium-strontium and pot
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Rhyolite. Much of the rhyolite is f
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grains in the formation have very t
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crustal parent rocks early in earth
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Main Phase Structures. Mesoscopic s
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'arious - bubt f ul TABLE 3 (contd.
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(S ) Strain-slip or 2 crenulation c
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It will be noted that the term "axi
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Figure 5. Photomicrographs showing
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Structural Geometry (Dalziel) Gener
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At the few localities where it coul
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fine crenulation longrain- Figure 7
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time and space before the strain is
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(dashed lhne Dalzid* ldd data) Figu
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the result of a minor amount of sho
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PALEOZOI C GEOLOGY (Dott ) Stratigr
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latter name has been restricted by
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TABLF: 6. MAJOR SILICATE MINERALS O
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TABLE 8: SIZE DISTRIBUTION DATA FOR
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The Oneota Dolomite, basal unit of
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Cross Laminae: Trough Axes: number
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At least three transgressive "cycle
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sedimentologist's equations. At Bar
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1. Grinding and chipping between th
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wave lengths. Thus it is improbable
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truncation surfaces separating cros
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processes or "environments" by the
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experiments in 1941, a sequence of
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GLACIAL GEOLQGY (Black) Introductio
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of pits and hollows. Knob and swafe
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fronts on prominent outwash aprons
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and Paleozoic rocks. Such pebbles a
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Windrow Formation of supposed Creta
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Kilbourn I Prairie du Sac Figure 17
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also have had their direction of fl
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TABU 11. SUMMARY OF NATURAL PLANT C
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Needless to say, white man's agricu
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Black, Robert F., 1964, Potholes an
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Fahnestock, R. K. , 1963, Morpholog
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Leith, C.K., 1913, Structural geolo
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Salisbury, R.D., 1895, Preglacial g
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Wells, J.W., 1963, Coral growth and
Page 101 and 102: East end of Baraboo Ranges at eleve
Page 103 and 104: Cross the road - but watch out for
Page 105 and 106: 49.3 Ochsner Park on left. Note wal
Page 107 and 108: Figure 21. Geologic map of Upper Na
Page 109 and 110: on the north bank of the river acro
Page 111 and 112: Van Hise (1896), Steidtman (1910),
Page 113 and 114: Large. Old Quartzite Quarry behind
Page 115 and 116: can be traced in the woods. It is o
Page 117 and 118: A fault may be present in the gap,
Page 119: solution from the quartzite into Ca
Page 122 and 123: Remarkably penetrative cleavage (Sl
Page 124 and 125: Junction with South Shore Road Turn
Page 126 and 127: Junction U.S. 12 Turn left, crossin
Page 128 and 129: Figure 29. Structures in the phylli
Page 130 and 131: Beneath the main phase fold shown i
Page 132 and 133: Figure 31. Geologic map of the La R
Page 134 and 135: Figure 33. Sketches of structural r
Page 136 and 137: edding surfaces are invariably slic
Page 138 and 139: At the mouth of Hemlock Draw there
Page 140 and 141: Return directly downhill (south) th
Page 142 and 143: uses). Pine Hollow exposes excellen
Page 144 and 145: Figure 37. Geologic map of the Denz
Page 146 and 147: 67.5 Tunnel City in cliff at left w
Page 148 and 149: 0 10 20 feet Figure 40. Sketch of e
Page 152 and 153: SUPPLEMENTARY STOP B -- Upper Narro
Page 154 and 155: 147 SUPPLEMENTARY STOP C -- Flagsto
Page 156 and 157: Orientation Data for Crorr Strrta P
Page 158 and 159: SUPPLEMENTARY STOP E -- Diamond Hil
Page 160 and 161: of STOP 6) because its southerly ve
Page 162 and 163: Figure 49. Structural relations in
Page 164 and 165: SSE NNW Figure 51. Secondary phase
Page 166 and 167: Features to be Seen: Compositional
Page 168 and 169: Figure 54. Tension gashes and quart
Page 170 and 171: Remarks : This is an excellent plac
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