18 baraboo trip

18 baraboo trip - Outline I. Introduction Regional...

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1 Outline I. Introduction Regional geological maps Baraboo geological overview Cross section - Baraboo syncline II. Geological History of the Baraboo region Stage 1 - Precambrian volcanism (RHYO) Stage 2 - Proterozoic deposition (SS) Stage 3 - Proterozoic metamorphism/deformation (QTZITE) Stage 4 - Paleozoic deposition (SS, DOLOSTONE) Stage 5 - Pleistocene glaciation (TILL)
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2 INTRODUCTION
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3 Simplified geologic map of Wisconsin Cross section - Baraboo Syncline Day 1 Day 1, 2 Day 2 N
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4 GEOLOGIC HISTORY OF BARABOO 1 BARABOO RECORD 5. Glaciation (20 - 12 kya) 4. Marine deposition (540 - 490 mya) 3. Metamorphism/Deformation (1.45 - 1.4 bya) 2. Marine deposition (1.5 - 1.45 bya) 1. Volcanism (1.6 - 1.54 bya) NO DEPOSITION 880 myr 40 myr 489 myr 3 2 4 5 4 Stages
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5 The North American craton Penokean (1.9-1.6) Assembly of the North American craton Subduction in this direction
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6 1. Volcanism North South Rhyolite Dark gray-red color Aphanitic Banded appearance suggesting volcanic flow Associated with tuff and volcanic breccia Penokean terrane Late Penokean orogeny (1.6-1.54 bya; Rb-Sr dating) Unconformity (40 myr) North South Penokean subcraton Erosion
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18 baraboo trip - Outline I. Introduction Regional...

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