Spectacular exposures of large, upright, vase- to barrel-shaped, late Pleistocene sponges are dramatically exposed as part of the Miami Limestone along margins of the C-100C Canal in east-central Miami-Dade County, southeastern Florida. The discovery of this sponge reef by K. J. Cunningham was made in 2004, during a routine drive across the bridge above the C-100C Canal on S.W. 97th Avenue in Miami-Dade County, southeastern Florida. A second location, where comparable sponges are exposed in walls of a burrow lake, was also discovered by K. J. Cunningham in 2004 upon visiting the site after personal communication with L. Noblick, Montgomery...

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