Reviews— Geology of Hungerford and Newbury. 569 
these figures with the record of the boring at Winkfield, near 
Windsor. There the thickness of the Chalk formation was found to 
be 725 feet, divided as follows: Upper Chalk, 337 feet; Middle 
Chalk, 169 feet; and Lower Chalk, 219 fect: 
The zones of the Chalk are not indicated upon the map, but they 
are fully dealt with in the memoir, and a sketch-map is given at p. 44 
upon which the boundaries of the upper zones are marked. In 
Mr. Jukes-Browne’s memoir on the Cretaceous Rocks of Britain, 
vol. iii, published in 1904, an account is given of the occurrence of 
the zones of Marsupites and of Actinocamax quadratus in the northern 
part of Hampshire (pp. 188-192), and, speaking of the latter zone, 
Mr. Jukes-Browne remarks that it appears to come in at certain places 
along the central part of the Chalk area between the anticlines of 
Winchester and Kingsclere. Probably, he adds, it only occurs in the 
form of outliers in the central part of the deeper synclinal troughs. 
The present memoir deals with the district to the north of the 
Kingsclere anticline, and the author brings forward evidence tending 
to justify Mr. Jukes-Browne’s inference, for he is able to record the 
occurrence of both the Marsupites and the <Actinocamar quadratus 
zones, the latter in two places, in both cases in a shallow syncline. 
It should be added that much of this evidence had previously been 
published in a paper by Mr. Osborne White and Mr. Llewellyn 
Treacher, read before the Geological Society on April 25th, 1906 
(Quart. Journ. Geol. Soc., vol. lxii, p. 499). Mr. White shows that 
the Marsupites zone, with its two sub-zones, the Marsupites band 
above and the Uintacrinus band below, is clearly recognisable in the 
Hungerford—Newbury district, but he states that the only places at 
which the zone is known to attain its full development at the outcrop 
are Kintbury, to the west of Newbury and Winterbourne, near 
Boxford, to the north-west of Newbury. He estimates the maximum 
thickness of the zone at 60 feet, i.e. about half that attained in Kast 
Kent and at Salisbury. The zone of Actinocamax quadratus has been 
recognised by the author in two small tracts, one on the spur of 
ground between Boxford and Winterbourne, and the other to the 
south of Kintbury. The thickness of the zone is 40 feet or more. 
Mr. Osborne White devotes a chapter to the consideration of the 
structural relations of the Chalk and the Lower Eocene beds. The 
Eocene strata to the south of the River Kennet rest, as a rule, upon 
the Chalk of the Marsupites band, but are underlain by the 
Actinocamax quadratus beds near Kintbury, by the Uintacrinus beds 
to the south-west and south-east of Hungerford, and by the Ifcraster 
cor-anguinum chalk to the north-west of that town. North of the 
Kennet the Tertiaries are in contact with the Uintacrinus band over 
a small, irregular, and possibly discontinuous tract extending from the 
neighbourhood of Wickham south-eastwards at least as far as, and 
probably much farther than, Shaw, but lie directly upon some part of 
the upper half of the Micraster cor-anguinum beds everywhere else 
except in the little area west of Winterbourne, where the Marsupites 
_ 1 J. H. Blake & W. Whitaker, ‘‘ The Water Supply of Berkshire’’: Mem. Geol. 
Sury., 1902, p. 95. 
