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Stratigraphy and Structure of North and Middle Fork Lytle Creek Canyon and Surrounding Areas



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Stratigraphy and Structure of North and Middle Fork Lytle Creek Canyon and Surrounding Areas Implications for Fault Displacement and Crosscutting Relationships By Shaun Hunter Wilkins Department of Geological Sciences California Polytechnic University Pomona September 23 2004 A Senior Thesis submitted in partial fulfillment of the requirements for the Bachelor of Science Degree in Geology 1 Table of Contents Introduction Data Observations 10 34 o Middle Fork Lytle Creek Study Area 11 29 General Description Lithology 12 20 Rock Sequence south of Icehouse Canyon and Middle Fork Lytle Creek Faults Rock Sequence north of Icehouse Canyon and Middle Fork Lytle Creek Faults Structure 21 29 Intrusive Relations Metamorphic Foliations on south side of Icehouse Canyon and Middle Fork Lytle Creek Faults Metamorphic Foliations on north side of Icehouse Canyon and Middle Fork Lytle Creek Faults Local Foliation in the Telegraph Peak granite along shear zones Lineation in mylonite vs Telegraph Peak granite Faulting o Upper North Fork Lytle Creek Study Area 30 34 Lithology 31 32 Structure 32 34 Intrusive Relations Metamorphic Foliations Faulting Discussions Interpretations 35 51 o Locations of Major Faults 36 40 Quaternary San Jacinto Fault Complex Pliocene Quaternary sinistral faults Late Miocene San Gabriel Fault system Paleocene Vincent Thrust o Maximum Displacement 40 43 San Jacinto Fault Complex Pliocene Quaternary sinistral faults San Gabriel Fault system o Speculation and Interpretation of cross cutting relations 43 51 Suggestions for Further Work 51 52 Conclusions 52 53 Acknowledgements 53 References Cited 54 55 2 Figure 1 Taking a well earned break on the north side of Lytle Creek s Middle Fork Introduction The eastern portion of the San Gabriel Mountains has never been studied in sufficient detail Many of the maps that currently exist were produced wholly or in part through the use of aerial photography Difficult terrain and time restrictions have not allowed for the



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