The limestone underlying the gravel further west (from about 30 to 80 kilometres west of the cultivation-limit) is only seen in small patches; it varies in character, being in some places loose and tufaceous in texture, and in others gritty and fissile, passing into a calcareous grit. The mass of gritty limestone at 78 kilometres, noted above, is about 6 metres in length by 2 metres high and broad; it shows a peculiar stalagmitic structure, the layers always parallel to the free surface. Several smaller masses found around all show a similar structure, and where the rock is exposed on the floor concentric fissuring is frequently seen. The sand which strews the surface here is largely calcareous, being doubtless in part derived from the gritty limestones. The eastern part of the low hills lying to the left of the track at about 85 kilometres from the cultivation-limit show the following section (total height about 13 metres):— _Top._ 1. Flinty gravel, the flints containing nummulites. 2. Tufaceous white limestone. 3. Hard pink siliceous limestone. 4. Fissile sandy marls and gritty limestones. On the western part of the hills the gravel covering is absent, the succession here seen being:— _Top._ 1. Sandy marls, 60 centimetres. 2. Very hard pink calcareous grit, 1 metre. 3. White sandy marl, fissile, 2 metres. 4. Soft red and white marls, 10 metres. No fossils were seen in these beds except the nummulites in the gravel, which prove the latter to be at least in part derived from Eocene deposits. The hills left of the road a little further on show the following section:— _Top._ 1. Flinty gravel; thin deposit unconformably overlying the limestone below. 2. Tufaceous white limestone (thin bed). 3. Hard grey crystalline limestone, 1·2 m. 4. Slope of sand and debris, doubtless covering soft marly beds. On entering the depression at 98 kilometres a band of earthy reddish limestone with Bryozoa is crossed, this bed appearing to overlie the fissile sandy limestone already mentioned. From here a good view of the numerous limestone hills is obtained, the top beds of hard limestone showing out sharply from the lower sand-covered slopes; the beds show a stratigraphical depression here in addition to the eroded surface depression. The floor of the depression is covered with sandy gravel and _Ostrea_ shells; an examination of the left scarp, about 3 kilometres after entering the hollow, showed the following succession of beds (total height of section 20 metres):— _Top._ 1. Hard white limestone with numerous shell-casts and containing some shaly layers, 3 m. 2. Debris-covered slope of softer beds with _Ostrea_ shells, 16 m. 3. Red earthy limestone with shells at base of hill.