Photo by Rod Benson 2015
This photo was taken from near the base of Siyeh Glacier in the east-central part of Glacier National Park. The view shows a 1-mile long lake named Cracker Lake, which was formed in a basin carved by a glacier during the last ice age. All of the glaciers from the last ice age melted completely, and then new valley glaciers such as Siyeh Glacier (photo) formed during a recent cold period that ended around 1850 ("The Little Ice Age"). Such lakes, referred to as "tarns" or "cirque lakes," are common in Glacier Park. Here is a photo taken from the opposite end of the lake.
To access my blog post about the day I hiked above Cracker Lake (lots of photos), click here: www.bigskywalker.com. The was my best day of hiking ever!
Got Milk?. . .
They won't settle down! . . . .
Why so blue? . . .
Seriously? "Cracker" Lake? . . .
Below: In 2011 a team of researchers from Middlebury College in Vermont extracted a core sample from sediment in Cracker Lake. The core, which measured 3.19 meters, was analyzed along with cores from several other lakes in Glacier Park to better understand the advance and retreat of glaciers since the last glacial period ended about 10,000 years ago. Glaciers in the park completely melted as the last glacial period (sometimes referred to as the last "ice age") ended. Evidence from the lake sediment cores and along with other types of evidence indicate that glaciers reappeared in this area about 6,500 years ago, and then experienced several periods of advance and retreat. Periods of advance occurred from 6,900 to 5,700 years before present (BP), from 3,700 to 1,900 BP, from 1,600 to 1,300 BP, and then again during a recent cold period referred to as The Little Ice Age that ended around 1850 AD. Perhaps more importantly, evidence shows that the time period since the end of Little Ice Age is the most dramatic episode of ice retreat in the last 10,000 years.
Term: tarn (cirque lake) - Be sure to tell how it is formed?
|*The blue won't last forever|