This week Bill takes us on a deep dive into some interesting cracks in Earth’s crust and explains things like karstification and dolostone
Manitoulin Island is blessed with incredible natural beauty mainly because of the rocks. Its rocks are oddities that make it an unusual and extraordinary travel destination largely because of the geological anomalies found there.
Alvars- and Geomorphology 101 Alvars, , are globally rare, naturally open habitats with either a thin covering of soil or no soil over a base of carbonate rock, such as limestone and dolostone. It is one reason why Manitoulin is unique. When you visit you will see a great deal of almost flat-lying, smooth pavement, linked to the movements of the glaciers. Soils are thin or almost non-existent. Because of the softness, the pavement's cracks form and become increasingly dissected. The fractures create blocks of various sizes called “clints.” The spaces between them are called “grikes.” These collect soil and plants take root. The sparsely vegetated bedrock barrens that develop are in fact, the alvars.
The book’s aim was to present a “simplified account” of the geological history of the area and to present interesting and unusual facts. The result was more than 2,300 cases of gastrointestinal disease and eventually seven deaths. It was attributed to farm runoff into an adjacent well that had been known for years to be vulnerable to contamination and to two employees of the Walkerton Public Utilities Commission who could have admitted to the contaminated water sooner.
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