Canadohta Lake (One of Pa's 50 glacial lakes.)
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A earthcache to show off 1 of Pa's beautiful glacial lakes
Canadohta Lake A glacial lake, formed 17,000-22,000 years ago during the Wisconsinan glaciation, Canadohta is the second largest natural lake (168 acres) in Crawford County, and one of the few kettle bottom spring fed lakes in Northwestern Pennsylvania.
The North Shreve Run - Oil Creek valley has been mapped as containing outwash, with kame terraces along the valley walls. The word kame indicates a landform that was created in contact with glacier ice. So the presence of kame terraces suggests that as the glacier was melting, toward the latter stages of melting,
A mass of ice remained in the valley, probably because the glacier was thicker in the valley. The kame terrace is composed of sediment deposited between the ice remnant in the valley and the valley wall. They are very common in NW Pennsylvania.
The outwash in the valley is sediment that was deposited by streams of meltwater flowing from the glacier as it melted. So the outwash at Canadohta Lake was deposited by meltwater streams when the front of the glacier, or valley ice remnant, was further up the West Shreve Run valley. As the ice front continued to retreat, meltwater from the glacier, laden with sediment that had been entrained in the glacier, flowed down the valley.
As the last glacier was retreating from the area, after the rest of the ice remnant in the valley (that created the kame terrace), a block of ice remnant still remained in the valley. The meltwater streams flowing down the valley deposited outwash, that it was carrying as its velocity decreased. The block of ice in the valley was completely or partially buried by the outwash. When the block of ice eventually melted, it left a depression in the outwash, which filled with water and became Canadohta Lake.
Canadohta Lake is approx 168 acres, with a average depth of 26 feet & max depth of 50 feet.
The Wisconsin glacial advance began about 70,000 years ago, reaching its maximum extent 18,000 years ago, before receding. Although there were numerous Ice Ages throughout the last few million years, the Wisconsin glaciation is what is usually being referred to when people say "Ice Age," because it is the most recent, sculpted many modern geological features (particularly in the Northern hemisphere), and affected human evolution and culture the most.
Because of successive glaciations, it is sometimes difficult to determine exactly which Ice Age had an effect on which geological feature, but thorough investigation has largely been able to piece it together. There are numerous valleys in North America, Europe, and Asia known to have been shaped by glaciation. These often feature large exposed areas of granite, sliced and ground by the immense pressure of ancient glaciers.
Requirements for this Earthcache are as follows:
You will need a thermometer.
Go to the following cords:
N 41 49.171 W 079 50.311 This is the mouth of North Shreve Run flowing into Canadohta Lake.
Please tell me the approx depth @ the mouth entering & the width @ the mouth of the creek.
Take the water temp, best to allow it (the thermometer) in the water for at least 1 minute.
The following set of cords will now take you to East Shreve Run Creek that also flow into Canadohta Lake.
N 41 49.006 W 079 49.994
Please tell me the approx depth @ the mouth entering & the width @ the mouth of the creek as it flows into the lake.
Take the water temp, best to allow it (the thermometer) in the water for at least 1 minute.
Is there a temp change between this location & the 1st location.
Explain to me your opinion of the water temps between the two.
N 41 48.195 W079 50.538
At the following cords/location, looking North please describe the creek flow @ the present along with the weather. (Dry, Sunny, Raining, Cloudy etc etc.)
BEFORE logging this earthcache, all answers MUST BE EMAILED to the cache owner. You may post a note explaining that you have done the earthcache, awnswers were emailed & awaiting conformation.
Any found it logs prior to conformation will deleted & removed
Optional Cachers may also submit a photo of themselves or their GPS Unit @ the 2nd location (East Shreve Run Creek mouth).
Additional Hints
(No hints available.)