Brett, Brunton & Calkin 2018 Niagara Gorge Geology AESE Guidebook-FINAL Sept2018

https://www.researchgate.net/profile/Frank-Brunton/publication/333430639_Brett_Brunton_Calkin_2018_Niagara_Gorge_Geology_AESE_Guidebook-FINAL_Sept2018/links/5ced691a299bf109da7711a1/Brett-Brunton-Calkin-2018-Niagara-Gorge-Geology-AESE-Guidebook-FINAL-Sept2018.pdf?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6InB1YmxpY2F0aW9uIiwicGFnZSI6InB1YmxpY2F0aW9uIn19 

https://pubs.usgs.gov/bul/2086/report.pdf