I wasn't sure where to write this question so if I put it in the wrong place and a moderator can move it to the right place, by all means be my guest. Just please send me an indication where you moved it to if you do.
I have been doing some snow machining in the Lake Louise area this winter and I have discovered some very large, unusual boulders located in the middle of nowhere that probably weigh close to a 100 tons. My question is, how did they get there? I am not a geologist but I do study geology a little bit as a hobby. I am aware of glacial erratic boulders located throughout the Matanuska-Susitna Valley that were deposited directly from the Naptowne glacier, but I was under the impression that the Lake Louise area was once under water due to an extremely large glacial lake known as glacial lake Ahtna. Supposedly this lake was as big or bigger than some of the great lakes of the midwest (lakes Michigan, Superior, Huron, Ontario, Erie etc.). So my question is, what force could be responsible for depositing these large boulders in the Lake Louise area? Were they deposited by glaciers before Lake Ahtna formed? If so, why are they not buried by lake sediments? Were they possibly carried by chunks of ice that broke off from the terminus of the glaciers surrounding Lake Ahtna? I'm not looking for 101 opinions. I'm actually wondering if anyone on here has actually studied the geology of this region in detail and if they can explain it to me in laymen's terms. Thanks.