MIDDLE CHALK—BERKSHIRE. 
457 
The hard nodular chalk of the Rh. Cuvieri zone can again be seen 
in two pits near Childrey Lodge, and the passage from this zone to 
that above is exposed in a pit where the roads branch south of 
Letcombe Basset. 
South of Wantage the hard chalk of the Rh , Cuvieri zone forms 
the promontory on which the workhouse stands, and there is a 
pit in the Terebratulina zone south of the workhouse. 
The Melbourn Bock is well exposed at the top of the quarry south 
of Chalkhill Barn, two miles south-east of Wantage, where the beds 
visible in 1887 were— 
feet. 
Soil and rubble of hard chalk -.4 
Melbourn /'Hard compact bedded nodular rock 5 
Bock. ( Very hard rough nodular rock 3 
Lower Chalk.—Marls and chalk (see p. 171) - - - -22 
The middle part of the Rh, Cuvieri zone, full of Inoceramus 
mytiloides , is quarried a little higher, by the side of Goddard’s Road. 
The Melbourn Bock can be seen in the railway cutting south¬ 
east of Chilton, near Downs Barn, and passes up into hard nodular 
chalk which includes a laver of hard vellow rockv chalk. 
«/ •./ «, 
A fairly good section of the beds above the Melbourn Bock is 
exposed in a quarry on the hill south of Upton. The beds dip at 
3° or 4° to the S.S.W., and about 30 feet must be seen. The highest 
part is firm and fairly compact,'becoming yellowish and nodular 
below, and passing down into hard nodular chalk which is part of 
the Melbourn Bock ; the base of this is not seen, but the lowest bed 
is very hard, rough, and mottled with greenish marl. In the higher 
beds Inoceramus mytiloides is abundant, with Rliynchonella Cuvieri 
and Terebratula semiglobosa. 
Along Whiteshoot Boad, leading from Blewbury to Wood way 
Farm, portions of the Terebratulina zone are exposed in a succession 
of small excavations made to carry off the rainwater; they show 
firm white homogeneous chalk with thin seams of greyish mail, but 
near the farmstead the chalk becomes harder and weathers out 
into hard rough lumps. 
Ivingstanding Hill, west of Moulsford, is part of a long spur 
of Middle Chalk. The Terebratulina zone is exposed by the roadside 
about 50 feet below the outcrop of the Chalk Bock, and I found 
Terebratulina gracilis var. lata and Discoidea minima in soft 
white chalk. Down the slope of the hill, on the road to 
Streatley, the harder chalk of the Rhynch . Cuvieri zone can be 
seen with the outcrop of the Melbourn Bock. 
South of Moulsford, in the valley of the Thames, the nodular 
chalk of the Rh. Cuvieri zone forms a well-marked ridge and seems 
to be faulted against the Lower Chalk, for it runs in a nearly 
straight line between the two main roads striking a little north 
of east. An old quarry about half a mile south of Moulsford 
