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F i. C) a *_ F; 3 t'1 ci i n •.=~ <br />Fault Geology ,k Folds <br />i it l ! • <br />:;,_ <br />MAINS FAULT CROSSING <br />I~~9 <br />n~ <br />,~'\ <br />W-~100m <br />.. ... _ <br />_ _ A - `~~ A. -5 m <br />.,..........1..._._ <br />seam <br />\` <br />~~ <br />~6 <br />5 10 20 m ~.d'~o, <br />-- -- <br />iertical exaggeration '• <br />f he duplex structure of the Mains fault leads to four (conflicting) ways of <br />measuring fault throw (these are labeled in cross section): <br />A. regional; B. fault average; C. floor fault; D. roof fault <br />Nhy a footwall fold? Fault slip may have propagated downward due to: <br />Overpressure conditions <br />Ductile flow by and accommodation into the Mancos Shale, ~60 m below <br />Stress anisotropy induced by the fault (modeling ire progress) <br />