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Scholars Day: April 7, 2010

Left-Lateral Kink Bands of Casco Bay, Maine

Lower Goose and Little Whaleboat Islands, located approximately 4.5 km SE of the Flying Point Fault inside the Norumbega Fault Zone in Casco Bay, Maine, are part of the Early Ordovician Cushing Formation, characterized by steeply-dipping, strongly lineated grey gneisses. Island exposures reveal large-scale left-lateral strike-slip kink bands with an estimated length of ~1 km. Much larger than any kink band that has been mapped or discovered in the region. Foliation was mapped using Total Station and RTK GPS survey equipment, and orientation measurements of gneissic layers were done with Brunton compasses and handheld GPS. Low elevation aerial photos of the outcrop surfaces were taken using a 14 m camera pole with a 9 mpx digital camera these photos were stitched together then expanded for visual representation. This equipment was used to calculate the force directions and geometries, so that the formation process of the kink band can be understood.

Presenter: Michael Collins (Undergraduate Student)
Topic: Earth Science
Location: 104 Holmes
Time: 3:10 pm (Session IV)