. Bulletins of American paleontology. Bulletin 332 Below these chaotic beds are the more normal deep- water clays of the Mao Clay Member of the Mao For- mation. At the t>pe locality near Mao (loc. TU 1337; see Saunders. Jung, and Biju-Du\al. 1986. text-fig. 29) these ha\ e been dated by Seiglie and Cucurullo (1971) as , as b\ .Akers (oral 1980). and as NN16 (= ) b> Saunders. Jung, and Biju-Duval (1986). Lithologically the Mao Clay is indistinguish- able from the upper parts of the Gurabo Formation, but the fauna indicates deposition in much deeper water. The Mao Ade
. Bulletins of American paleontology. Bulletin 332 Below these chaotic beds are the more normal deep- water clays of the Mao Clay Member of the Mao For- mation. At the t>pe locality near Mao (loc. TU 1337; see Saunders. Jung, and Biju-Du\al. 1986. text-fig. 29) these ha\ e been dated by Seiglie and Cucurullo (1971) as , as b\ .Akers (oral 1980). and as NN16 (= ) b> Saunders. Jung, and Biju-Duval (1986). Lithologically the Mao Clay is indistinguish- able from the upper parts of the Gurabo Formation, but the fauna indicates deposition in much deeper water. The Mao Adentro Limestone Member is the basal part of the Mao Formation and consists of a series of interla\ered coral beds and clay. At the type locality of the Mao .Adentro Limestone (loc. TU 1336: see Saunders. Jung, and Biju-Duval. 1986, text-fig. 15) it can clearly be seen that the coral layers represent grav- ity flows into the blue clays of the Mao Formation. The corals are not in place but are jumbled breccias bounded abo\e and below by cla> that is identical lithologicalh and faunally to the type Mao Clay; ac- cording to .Akers the age of the clay at both places is Cooke {in Vaughan et al., 1921, p. 73) noted five limestone ledges and five shale beds within 8 m (ver- licalh) at Mao Adentro. Where the Mao-Sabaneta road crosses the Samba Hills ridge, about 4 km east of Los Quemados (loc. TU 1208), road work in 1981 exposed a magnificent sec- tion of the Mao Adentro Limestone. The type locality is somewhat difficult of access but this roadcut (Text- figs. 6, 7) shows the nature of the Mao Adentro ex- tremely well and might be taken as an alternative type locality. It is approximately km (airline) west of the type localit) (loc. TU 1336) on the Rio Mao. 0\erlying the Baitoa Formation (unconformably) and the Bulla Conglomerate (gradationally) and un- derh ing the Mao Formation are two faunal units that ha\ e been designated as the Cercado and Gurabo for- mations. They are
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