That tropical-looking "sandy" beach near the east side park entrance at Lake Shore Drive is not actually sand at all!
It is made up of Zebra Mussel shells that have been ground down over time by wave action
The recent storm washed up large numbers of mussels on to that beach. The flesh inside the shells is now rotting and giving off a foul smell but, with the heat, the shells will soon dry out and, eventually, form more "sand".
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