During dredging operations in the Straits of Florida, Leo Burry, a private shell collector, obtained a rock specimen from the ocean floor. Through the cooperation of Maurice Ewing of Columbia University and John C. Armstrong of the American Museum of Natural History, the writer obtained this specimen for analysis.

Burry was dredging in the Straits of Florida between Florida and Cuba, south of American Shoals, at 24° 10′ North Latitude, 81° 31′ West Longitude. The dredge became secured on the bottom, anchoring the boat during a short rain squall. After the storm the dredge was freed from the bottom and...

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