Glaciers of our ancestors

It was the beginning of January, 2012. I had gone north from Glacier National park in the US, crossed the border and entered Canada in the province of British Columbia just west of the Alberta state border, and south of Banff. My intension was to take the southern route going west back towards Vancouver, and stop on the way wherever it looked good. I had travelled some of these roads before, but not in the dead of winter. A lot of high mountain roads were involved, with sudden change of altitude and weather. Heavy snow and limited visibility in sharply curving mountain roads were to be expected. One had to be vigilant.

I was also going through what many call the southern edge of British Columbia’s wine country. A few of the vineyards were within site, among the lower foothills of the mountains.

I was watching the scenery. It took me a while to identify what was intriguing me so much. It was the slopes of the distant hills to my left. There was something odd about it. It was not just a farmland, a few farmers vehicles in the foreground, and a low hill in the background.

I slowed down and watched the side of the hill for a while – till I could not continue any longer. I had to stop, and seek out a dirt road going through the farmland towards the low hills, so I could take a closer look. Beyond the flat farmland, as the land began to slope upwards, there is a vineyard. Someone had planted grape trees what were currently barren, shorn of leaves in the winter. Its not so visible from here, but can be seen closer to the hills.

But what drew my attention was the hill itself.

The side facing me was rocky, without much soil cover, and therefore mostly barren with no trees. At the upper regions, there was soil and also trees.

The rocky slope facing me had a light powdering of snow. Water coming down over thousands of years had carved the rock and made a few channels and ravines. Gravel and dirt coming down from top had collected into these ravines, enough to support a few trees.

But, right across that bare rock face staring at me, were horizontal gigantic scratch marks, over which the water-cut ravines ran zigzag down the slope. These scratch marks, were the ten thousand year old footprints of a gigantic glacier that ploughed and ground its way through this land, carrying huge boulders, rocks and other material that caused those horizontal markings on the rock face. Those tell tale footprints of the passing glacier has survived the ten thousand or so years, and remains visible primarily because soil and trees have not hidden them from view.
Water has done its work over it, cutting all those vertical channels over the horizontal scratches. And trees have grown where soil collected at the depths of those channels.

I am not a geologist, and never studied the subject except for reading a book that Gautam Sen had given me, written by a French Geologist, some fifteen years ago while I lived in Florida.

And yet, here I was – mesmerized by a geologic text book facing me through a simple rock face of a hill by a quiet stretch of highway heading west towards Vancouver.