A. J. Jukcs Broicne — On the Tipper Greensand, etc. 363 
tliis is not strictly true, because the former zone contains beeis of 
Gault Clay which have never been included in the Upper Greensand. 
The real fact is, that recent researches have shown the formations 
known as Gault and Upper Greensand each to consist of two 
divisions, but the lower part of the one being United palaeonto- 
logically with the upper member of the other, only three well- 
marked groups can be established. Supposing, therefore, that the 
names of Gault and Upper Greensand are still retained, we must 
decide to which of the two this intermediate zone more probably 
belongs, whether in fact we should extend the Greensand down- 
ward or the Gault upward. I would advocate the latter measure, 
and the restriction of the term Upper Greensand to the group of 
beds containing a Warminster fauna ; with regard to stage B, 
containing Ex. conica (the Upper Greensand of Mr. Meyer), I do 
not think Dr. Barrois gives very strong reasons for classing it in 
the lower division ; it is true that it does not contain many fossils, 
and that these do not indicate any marked afiinities, but the large 
Janira cequicostata is I think mostly found in the Warminster 
beds ; its lithological Constitution eertainly links it rather with 
the upper than the lower beds. I would suggest, therefore, that 
the zone B of Ex. conica be included with the Warminster beds, 
and that the limit of the lower division be placed at the shingle 
beds in No. 4 of Mr. Meyer’s section. The upper division would 
then Gonsist of two parts, zone of Pecten asper and zone of Ex. 
conica, De Rance, the lower of which may be taken as forming the 
base of the Upper Greensand. As a matter of fact this bed has 
always been included in that formation, and it would cause great 
confusion if in retaining the term we excluded this part of it ; the 
twofold Constitution of the Greensand is well seen at Wantage, 
wbere, according to Mr. E. C. Davey, 30 feet of 6oft greensands are 
underlaid by 6 feet of firestone. 
General Classification. 
/ e Marl with small Brachiopods 
Chalk Marl < b Zone of Plocos. maandroides 
\ a Glauconite '(Chloride) Marl 
Upper Greensand j Wa ™ inster ^ds = zones of P. asper and 
\ Ex. cotnca (De Bance) 
Blackdown beds or zone of Ammonites 
inflatus 
Lower Gault } Alblen of D’Orbigny = zones of Am ' 
[ lautus and Am. mterruptus 
Lower Greensand 1 A l’ tien of D’Orbigny = zones of Am. mam - 
er Ureensana | miliaris and Folkestone beds. 
The arrangement above suggested has also the ruerit of necessita- 
ting only a very slight alteration in the lines on the published 
Survey Maps, the term is rendered lithologically applicable, and a 
definite fauma is secured to the formation instead of a mixture of 
two different groups. It is true that the lists of Upper Greensand 
fossils will have to be revised, and those excluded which belong to 
the lower zone ; but that was requisite in any case, and I venture to 
hope that in the future care will be taken to indicate the exact 
locality and horizon where any particular fossil or fossils are found. 
Upper Gault 
) Feet 
[ 40—80 
| 35—45 
| 60—100 
| 30-150 
| ?— 100 
