The Jacaguas Group is here named. Includes the intertonguing Augustinillo Formation and its Collores and Monserrate Members and Naranjo Formation and its Miramar, Coamo Springs Limestone, Rio Descalabrado, and Guayo Conglomeratic Sandstone Members. The Coamo Springs was named Coamo Springs Series by Hodge (1920) and here revised as a member of the Naranjo.

Source: GNU records (USGS DDS-6; Reston GNULEX).

The Jacaguas Group of Pessagno (1960a) is here adopted, as well as the Miramar, Guayo, and Rio Descalabrado Members of the Naranjo Formation of Pessagno (1960a) and the Los Puertos Member of the Naranjo of Pessagno (1960b). The Naranjo Formation and its Coamo Springs Limestone Member and the Augustinillo Formation and its Collores and Monserrate Members are not adopted or discussed. The Raspaldo Formation is here named in the Jacaguas and the Cuevas Limestone of Glover (1961) is assigned to the Jacaguas. Formations are, in ascending order: Miramar, Los Puertos, Raspaldo, disconformity, Cuevas, Guayo, Rio Descalabrado. Unconformably overlies the Coamo Formation; unconformably underlies the Juana Diaz Formation. Age is Late Cretaceous (Maastrichtian) to middle Eocene. The Cuevas Limestone is partly equivalent to the Coamo Springs Limestone and replaces the Coamo Springs here, which is not recognized.

Source: GNU records (USGS DDS-6; Reston GNULEX).