. Bulletins of American paleontology. 14 Bulletin 332 (Bom, mS). Murcx messoriusSowerhy, 1841a, as well as Aphera islacolonis (Maury, 1917), the so-called "guide fossil" to the Cercado Formation. At Arroyo Puiial (loc. TU 1353: see Saunders. Jung, and Biju-Duval, 1986, text-fig. 37). on the basis of the presence of certain planktic foraminifers, the beds are estimated to have been deposited in comparati\ely deep water, more than 100 m. As with the Rio Verde the mollusks have been carried by gravity-flows into blue class that are basically barren of mollusks and that, in ever> resp
. Bulletins of American paleontology. 14 Bulletin 332 (Bom, mS). Murcx messoriusSowerhy, 1841a, as well as Aphera islacolonis (Maury, 1917), the so-called "guide fossil" to the Cercado Formation. At Arroyo Puiial (loc. TU 1353: see Saunders. Jung, and Biju-Duval, 1986, text-fig. 37). on the basis of the presence of certain planktic foraminifers, the beds are estimated to have been deposited in comparati\ely deep water, more than 100 m. As with the Rio Verde the mollusks have been carried by gravity-flows into blue class that are basically barren of mollusks and that, in ever> respect except age, resemble the Mao Clay. One could make the case that the very deep- water Gurabo Formation exposures in the vicinity of Santiago should be called "Mao Clay" as they were mapped by Dohm (//; Bold. 1968, text-fig. 6). The t>pe localit> of the Gurabo Formation is on the Rio Gurabo. both north and south of the crossing of the road from Los Quemados to Sabaneta. Today a high-le%el concrete bridge is planned, which will re- place the old ford (for a time there was a low-level concrete bridge, until it washed out in 1980), approx- imately one-half km above the ford. The old crossing is still visible and is used as a path to the river for cattle (Text-fig. 8). The old trail to what is called "Gur- abo Adentro" on the USGS map (Vaughan et al., 1921, pi. 11) is now utilized as access to the numerous small farms that dot the area. Although the stratigraphy of the Cibao Valley has now been definitively established by the NMB work (Saunders, .lung, and Biju-Duval, 1986), when we be- gan our work in 1976 the only reference we had avail- able was Maur> (1917). Thus, we based our collecting localities and our understanding of the stratigraphy upon her data. Even if it is now of no more than historic interest, it seems relevant to this study to examine her concept of the stratigraphy. Maur>' zoned the Gurabo outcrop from "A" to "F&qu
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