540 Ma. 1.0 Ga. 1.4 Ga Ga

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2 o 115 o o BEAVERHEAD MTNS. Beaverhead Impact Site A A o 44 SALMON RIVER MOUNTAINS x Stanley SAWTOOTH MTNS. WHITE CLOUD PEAKS BOULDER MTNS. N x Hailey 0 x Challis PIONEER MTNS. x Grouse Peak LOST 114 o LEMHI Magnetic High WHITE KNOB MTNS. 50 km x Mackay Hawley Creek Thrust RANGE RIVER RANGE Arcuate track of magnetic anomaly highs x Arco Magnetic anomaly highs > nt Gravity high Arcuate track of magnetic anomaly highs Inferred continuation of arcuate magnetic high Neoproterozoic Mesoproterozoic Ordovician Cambrian 540 Ma 1.0 Ga 1.4 Ga 1.47 Ga Northern Lost River Range Kinnikinic Quartzite Summerhouse Formation Formation of Leaton Gulch? OZlu Impact event??? Lawson Creek Formation Swauger Quartzite Lemhi Group Beaverhead and Lemhi Ranges Kinnikinic Quartzite Beaverhead Pluton Summerhouse Formation Formation Tyler Peak Wilbert Formation Swauger Quartzite Lemhi Group Pocatello and Bannock Ranges Swan Peak Quartzite Carbonate rocks Elkhead Limestone C Brigham Group Z Pocatello Formation

3 60 Grouse Peak Q 70 A OZlu Tc N 0 Miles.5 o Tc Q Tc 50 E 50 B Leaton Gulch C Q OZlu Tc Tc Q D Scolithos 30 OZlu Q Q Quaternary undifferentiated Tc Eocene Challis volcanisc undifferentiated OZlu Formation of Leaton Gulch upper Formation of Leaton Gulch lower Breccia o o o

4 Neoproterozoic-Cambrian Formation of Leaton Gulch OZlu Meters 39, 40, Burrowed red siltstone Sandstone with rip-up clasts Deep red sandstone Conglomeratic sandstone Gradational contact Sedimentary breccia Clasts of 41 Quartz arenite Scolithos present upsection 46 Channelized contact 47, 48, 49 Sandstone and phyllite F F Craton Interior Transitional Continental Basement Uplift Transitional Continental Basement Uplift Qt OZlu and Cambrian and Late Proterozoic Wilbert formation Middle Proterozoic strata OZlu Qm OZlu matrix + OZlu clasts Craton Interior Recycled Orogenic Mixed Dissected Arc Quartzose Recycled L Transitional Recycled Lt

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7 0 Grouse Peak Breccia Crater diameter = 100 Km Beaverhead Site Stratigraphic uplift=10 Km Ejecta blanket 10 Upper Crust 20 Shattercone sites Structural disturbance = 30 Km Lower Crust 30 Km 2.5 Vertical Scale 0 Change 10 A? Approximate zone of Brittle disruption? mantle 0 40Km Beaverhead Grouse Idaho Basin and Range HCT Site CT Peak Batholith Challis Volcanic Field T A Y T Z Y A Z Y Kg Y Challis Volcanics Y X? P Z Y X? and magnetic anomaly Upper Crust X? Gravity X? 20 B Shattercones 30? Tertiary Intrusions Mantle? Km Lower Crust?

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