Figure 7. A) Graph of sand composition showing 66.65% biogenic components and 33.35% terrigenous material. B) Histogram of grain sizes (8/8/19). C and D) Photomicrographs of Ocean Park sand. Note the abundance of calcareous sand particles (echinoderm spine). Source: Pérez-Valentín

From

Impact of Extreme Weather Events on the Beaches of Puerto Rico: The Case of Ocean Park, San Juan

Rafael Mendez-Tejeda, Kevián Augusto Pérez-Valentín, Maritza Barreto-Orta

American Journal of Marine Science. 2020, 8(1), 1-5