Marl lake
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A marl lake is a type of alkaline lake whose bottom sediments include large deposits of marl, a mixture of clay and carbonate minerals. The term is particularly applied to lakes that have been dredged
One of the Houghton Regis Marl Lakes
Deposition from a Marl lake inside a sheltered paint can, taken from Siseebakwet Lake
Portland cement
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Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydra
Marl lake
…a mixture of clay and carbonate minerals. The term is particularly applied to lakes that have been dredged or mined for marl, often for manufacturing Portland cement. Marl lakes are found around the Great Lakes of North America, in Britain, and in other areas that were once glaciated. They support distinctive…
Bags of Portland cement wrapped and stacked on a pallet.
Blue Circle Southern Cement works near Berrima, New South Wales, Australia
Plaque in Leeds, England commemorating Joseph Aspdin
William Aspdin is considered the inventor of "modern" Portland cement.