Image Description from historic lecture booklet: "Many of the
boulders and pebbles of the till are found to be glaciated, or marked
with parallel scratches. Often they look as if engraved with a sharp
need. Sometimes the scratches are deep and rough. A marked polish is
seen on some stones. If we dig through the subsoil to the bed-rock, we
shall often find the latter scratched in the same way, or even deeply
grooved and carved into fluting's and the folding. The glacier, shod
with stones at its base, drags these over the bed-rock, and thus both
the moving fragments and the floor over which they move are polished
and graven. The direction of the scratches corresponds to that in
which the erratic boulders have been moved, and so, putting these
other facts together, we have full proof that glaciers have done the
Original Collection: Visual Instruction Department Lantern Slides
Item Number: P217:set 012 011
You can find this image by searching for the item number by clicking here.
Want more? You can find more digital resources online.
We're happy for you to share this digital image within the spirit of The Commons; however, certain restrictions on high quality reproductions of the original physical version may apply. To read more about what “no known restrictions” means, please visit the Special Collections & Archives website, or contact staff at the OSU Special Collections & Archives Research Center for details.