What Are The Gigantic Boulders Left Behind As The Glaciers Receded?

As the glaciers retreated after the last ice age, they left behind enormous boulders scattered across North America, Europe, and other regions of the world. These boulders, known as glacial erratics, can range in size from small pebbles to massive rocks weighing hundreds of tons.

Glacial erratics are extremely varied in shape and size, but the most striking are the giants; huge boulders left behind by the movement of glaciers. Some of these giants can reach up to 30 meters in length and weigh around 2,000 tons—transported and moved by the immense power of the glaciers that once blanketed the landscape.

The erratics were formed when the glaciers pushed and carried pieces of debris along the bedrock, eventually releasing them as they melted. Scientists can trace these giant boulders back to their original source, providing valuable geological information about the paths and timing of ancient glaciers.

These stony behemoths have been important both geologically and culturally. They have been used as natural monuments, impressive artistic canvases, mysterious spiritual places, and even as anchors to hold down the covering of hot air balloons.

So no matter where you live, take a look around and you might find a glacial erratic hiding in plain sight. These enormous boulders are a reminder of how powerful nature can be and how incredibly ancient the Earth is.

References

1. Butterfield, Eric. “Glacial Erratics.” The Spruce, 2 Feb. 2020, www.thespruce.com/glacial-erratics-4582616.
2. Robinson, Iain. “Giant Glacial Erratics – The Remains of Ancient Glaciers.” Geological Society of America, 29 July 2014, www.geosociety.org/GSA/GSA_Today/giant_glacial_erratics/.
3. “Glacial Erratics.” Canadian Geographic, 17 Feb. 2017, www.canadiangeographic.ca/article/glacial-erratics.