TJie Geology of Coimaidai. 63 



limestone, 10 feet. The clay bands vary much in 

 thickness and show considerable disturbance, 

 (o) Yellowish limestone, soft as a rule, but containing 

 lenticular bands of hard limestone, 6 feet. 



(4) Thin bed of ash, 6 inches. This stratum varies in 



thickness from two inches to one foot. In marked 

 conti-ast to the individual beds of the series, it has 

 a wide distribution ; it has been picked up on 

 both sides of the valley, and constitutes a valuable 

 bench mark. 



(5) Yellowish white limestone of varying texture and 



hardness ; it is honeycombed in places, 6 feet. 

 (<■)) Gravel and calcareous sand, 12 — 15 inches. The 

 gravel is mainly quartz, but fragments of neigh- 

 bouring Silurian rocks are frequent. The pebbles 

 composing it are somewhat angular as a rule. 

 (7) Calcareous sand, 3 feet. It is somewhat soft, but 

 merges into harder calcareous bands in jDlaces. It 

 is from this bed that the mammalian bones have 

 been for the most part obtained. 

 (S) Grit, sand and gravel, more or less calcai'eous, 1 foot 



S inches. 

 I 9) Soft, earthy and gritty limestone, passing into a 

 harder, somewhat ferruginous, material containing 

 lenticular masses of hard, compact stone, 6 feet. 

 (10) Hard, compact limestone, very tine-grained in places, 

 in others gritty, with quartz grains. The colour 

 varies from a fawn colour to white or bluish-white, 

 the rock of the latter tint being exceedingly line- 

 grained. About two feet of this bed is exposed ; 

 it is the lowest to be seen in the quarry. We 

 were informed by the Messrs. Alkemade that they 

 sank a shaft for about thirty feet through this 

 stratum without reaching the bed-rock. 

 The thickness of the section we have constructed may be 

 taken to be about forty-four feet, and if the thickness of the last- 

 mentioned bed be taken at twenty-six feet, a total thickness of 

 seventy feet in round numbers for the whole series is obtained. 

 The thickness of rock above the bone bed is about thirty-three 



