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A glacial erratic is a piece of rock that differs from the size and type of rock native to the area in which it rests. "Erratics" take their name from the Latin word errare, and are carried by glacial ice, often over distances of hundreds of miles. Erratics can range in size from pebbles to large boulders such as the 'Big Rock' weighing about 15,000 tons in Alberta, Canada.

Geologists identify erratics by studying the rocks surrounding the position of the erratic and the composition of the rock itself.

Since they are transported by glaciers, they are one of a series of indicators which mark the path of prehistoric glacier movement. Their lithographic origin can be traced to the parent bedrock, allowing for confirmation of the ice flow route. As an example, they can be transported by ice-rafting. This allows quantification of the extent of glacial flooding resulting from ice dam failure which release the waters stored in proglacial lakes such as Lake Missoula. Erratics...

Photography is all about using light to capture the emotion and beauty of a fleeting moment. For me, this adventure began with a single spring image using a small Kodak film camera of a freshly watered central Kansas ditch and has come full circle using modern digital techniques. My first camera was acquired by trading an ancient Royal typewriter to a fellow college student who was desperate to finish a term paper. It was a long time ago and that camera was my passport to an art that has fascinated me ever since. I owned and operated a professional studio in central Kansas for 20 years and moved to Colorado in 1994. Part of the studio's early success came from creating outdoor portraiture using controlled lighting...