If you are interested in learning more about glacial deposits and how erratics can be useful in other contexts, here are a few interesting research papers related to the subject!
Briner, J.P. et al. “Last Glacial Maximum Ice Sheet Dynamics in Arctic Canada Inferred from Young Erratics Perched on Ancient Tors.” Quaternary Science Reviews 22 (2013): 437-44. ScienceDirect. Web.
Davis, Nicole K. et al. “Glacial Lake Musselshell: Lake Wisconsin Slackwater on the Laurentide Ice Margin in Central Montana, USA.” Geomorphology 75 (2006): 330-45. ScienceDirect. Web.
Evans, D.J.A. et al. “Glacial Landforms, Sediments: Glacial Erratics and Till Dispersal Indicators.” Encyclopedia of Quaternary Science (Second Edition) (2013): 81-84. ScienceDirect. Web.
Mackintosh, Andrew N. et al. “Retreat History of the East Antarctic Ice Sheet since the Last Glacial Maximum.” Quaternary Science Reviews 30 (2013): 1-21. ScienceDirect. Web.
Plouffe, A. et al. “Integrating Ice-flow History, Geochronology, Geology, and Geophysics to Trace Mineralized Glacial Erratics to Their Bedrock Source.” Canadian Journal of Earth Sciences 48.6 (2011): 1113-129. EBSCO. Web.
* If you know of a relevant peer-reviewed article that isn’t listed, feel free to let me know and I will add it!