Andrew. — On the Clarendon Phosphate-deposits. 455 



rarely found; those identified were (1) Magellania sinuata, 

 Hutton ; (2) Pecten hochstetteri, Zittel ; (3) Pecten williamsoni, 

 Zittel ; Scalaria browni, Zittel ; (5) Scalaria lyrata, Zittel. 



Band, D. — This is a rough knubbly limestone, 3 ft. thick, 

 which in general appearance looks very much like a coarse con- 

 glomerate, with limestone pebbles and matrix. The pebbles of 

 this conglomerate are about 3 in. in diameter, and slightly 

 rounded ; they consist of a pure white limestone, probably 

 identical with that of band C. The limestone forming the 

 matrix of these pebbles is less pure and is freely speckled with 

 glauconite ; it resembles the limestone of band E, immediately 

 above. The junction of this band with the subjacent C is not 

 so clearly defined as its junction with the overlying E. It forms 

 a strongly marked band around the face of the quarry, and has 

 a slight dip (0° 43' in a direction E. 9° N.). 



In former times, after band C had been laid down, it would 

 seem that it had been raised to near the level of the waves, which 

 pounded fragments off its upper surface, rounded them, and 

 spread them evenly out. Afterwards, conditions having changed, 

 the coral mud which now forms band E was deposited over the 

 area ; it first filled up the spaces between the rounded fragments 

 and then spread itself over them to a depth of 6J ft. The only 

 fossil traces found in D consist of fragments of the shells of 

 Brachiopoda. This band is also distinguishable in Wilson's 

 quarry, but is not so clearly marked. 



Band C. — This is the principal band at the Millburn quarry, 

 where it extends 42 ft. upward from the floor. It is regularly 

 laminated, the laminae being from 2 in. to 5 in. apart. When 

 freshly quarried the lamina? often show a faint pink or greenish 

 tint, which rapidly disappears on exposure. An analysis of this 

 limestone gave the following : — 



Insoluble gangue . . . . . . 2*21 



Lime (CaO) . . . . . . . . 54-12 



* Carbon-dioxide (CO 2 ) .. .. .. 42-86 



t Phosphoric acid (P 2 5 ) . . . . 0-018 



99-208 



Equivalent to- 



* Calcium-carbonate . . .. 97-41 



f Calcium-phosphate . . . . . . 0-039 



The following fossils were identified from this band : 

 (1) Nodosaria subsimilis, Stache ; (2) Cristellaria rotulata, La- 

 marck ; (3) Textularia agglutinans (?), d'Orbigny ; (4) Cidaris, 

 sp. ; (5) Brissus (Meoma) crawfordi, Hutton ; (6) Serpula, sp. ; 

 (7) Magellania lenticularis, Deshayes ; (8) Magellania sinuata, 



