Soil. What about it?

Recently, I have found an interest in the area of deglaciation. That is to say, the mystery of what happened here thousands of years ago gave shape to what can be seen here today. Our farm sits on mostly clay/silt, but has a few bands of sand here and there as well as some random rocks thrown in where you least expect them. Those rocks have often been unearthed with the tractor and plow, though one was found with a new set of blades on our riding mower. Ooops. 

What can be seen specifically in our yard is banding of different soil types as it settled, presumably after being washed out of the retreating Laurentide Glacier and then being settled by the ancient glacial Lake Agassiz. It is hard to picture in your mind as you stand in the yard, a wall of ice, melting and crumbling away, perhaps hundreds of feet high where your house now sits. The random rocks would have been bulldozed by the glacier off the higher rocky prominences in the area, only to fall off the edge of the glacier as it melted in later times. Speculation, it may be, but we do have glaciers today that have shown us how they behave. It can make a person feel pretty small in the world, but maybe moreso blessed to be witness to the evidence! 

 Our farmyard is a soil called Orthic Gray Luvisol, for the most part.  I know the Poplar trees like it and thrive in this soil, as do the Moose Maple and Balsam trees. That being said, it grows a good crop of beans and with a bit of biomass such as the rotted overburden of needles, leaves and such, potatoes love the soil as well as much of our selected crops. Then there is this very interesting but oh, so stubborn hard-pan layer that sits below the top level of soil. It is made of calcium carbonate - the same stuff that makes well water hard. It prevents rain water from going deep into the soil and gives our farm a problem with rainfall runoff. So last year we purchased a big, chisel like device for the tractor called a middle-buster. It can penetrate the hard pan with a bit of effort, giving much needed drainage and also causes some of the calcium carbonate to return to the growing soil which is of benefit to the crops. 

Apart from the farm, the Dryden area can reveal the glacial evidence in other ways. There are very cool features on the shores of Wabigoon lake called "varves" in the clay banks. Basically the layers that were built up over the centuries of glacial melt. You can also find moraines (large gravel features that run for many kilometers at a time) as well as eskers which make some beautiful sandy/gravelly "varves" as well. This photo was taken East of the farm, in a gravel pit. The layers are incredible!

Also, a little closer to home is this massive boulder, all by itself amongst much smaller clast (broken rocks) on a clay hillside. It is quite amazing, being that it is approximately 20 feet by 16 feet wide and 8 to 10 feet high!  Just think, the glacier carried it to that spot!

Enjoy your time outside and keep your eyes open! You never know what interesting thing you might find!