. Bulletin of the Natural Histort Museum. Geology series. HOWARTH AND MORRIS lowest Cretaceous in Wadi Hajar is given in Fig. 2, and a scheme of zones for the Callovian to Berriasian stages showing the positions of the dateable ammonite faunas in the Wadi Hajar succession, is given in Table 2. Naifa Cliff The splendid cliff section in the right bank of the river below the village of Naifa (=Neifa, Nayfa and Nayfah). approximately 2 km upstream from the road/river crossing at Al Ma'abir, is the type section of the Naifa Formation (see Fig. 9). The base of the Billum Member is not expo
. Bulletin of the Natural Histort Museum. Geology series. HOWARTH AND MORRIS lowest Cretaceous in Wadi Hajar is given in Fig. 2, and a scheme of zones for the Callovian to Berriasian stages showing the positions of the dateable ammonite faunas in the Wadi Hajar succession, is given in Table 2. Naifa Cliff The splendid cliff section in the right bank of the river below the village of Naifa (=Neifa, Nayfa and Nayfah). approximately 2 km upstream from the road/river crossing at Al Ma'abir, is the type section of the Naifa Formation (see Fig. 9). The base of the Billum Member is not exposed in this cliff, but it is clear in the nearby locality south of Wadi Kilya (see below, and Fig. 5) and is also exposed immediately west of the road/river crossing at Al Ma'abir. In Naifa Cliff 33 m of alternating limestones and marly limestones of the Billum Member, in which no ammonites were found, are followed by the Kilya Member, which consists of m of marls with subsidiary limestones in its lower part, then 21 m of thicker limestones in the upper part (Fig. 3). The upper marly part of the Kilya Member is missing at Naifa Cliff, where the highest horizon is near the top of the middle limestone part (as compared with the thicker development of the Kilya Member in Wadi Kilya), and the eroded top is overlain by Quaternary river gravels. The 'oil shales" of Little (1925: pi. 24) are probably at the base of the Kilya Member on Fig. 3. Considerable numbers of ammonites (mainly large perisphinctids) were found loose at the foot of the cliff, and they were traced to a mid-brown-weathering limestone near the bottom of the middle limestone part of the Kilya Member, as shown on Fig. 3. Some of the perisphinctids attain sizes larger than 250 mm diameter, and two exceptionally large (400-500 mm diameter) specimens of Idoceras cf. hararinum Venzo were seen, one of which was collected. Below this horizon of prolific ammonites, ammonites were collected from three other horizons
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