of the Inferior Oolite. 145 
the lower part, and imto brownish or foxy-coloured micaceous 
sandstones in the upper part, so that the whole nearly resembles 
the Cotteswold Sands, and differs chiefly in its greater compact- 
ness. Fossils are distributed very sparingly throughout the 
mass of the sandstones, but they are present more abundantly, 
as in the Cotteswolds, in two calcareo-argillaceous zones, situated 
in like manner, the one at the top, the other near to the base of 
the series. The lower fossiliferous zone is a dark grey concre- 
tionary band of rock crowded with valves of Lingula Beanii ; in 
smaller numbers are Orbicula reflexa, Vermetus concinnus, Avicula 
inequivalvis ? and another Avicula, a small smooth Pecten, Cert- 
thium, &e. Belemnites are not uncommon, but Ammonites are 
rare, and are obtained singly and at intervals throughout the 
sandstones; these are, A. variabilis, var. Beant, A. striatulus, 
and A. Aalensis; the latter form has not been observed in the 
Cotteswolds, but occurs in the same stage (Lias Zeta of Quen- 
stedt) in the Jura. Vermetus concinnus occurs at intervals 
throughout the sandstones in small groups, and usually isolated. 
The dark grey colour of the lower beds of sandstone changes 
upwards to a foxy hue, and at the summit is the upper fossili- 
ferous zone, from 14 to 18 inches thick, concretionary and 
dark-coloured ; altogether it nearly resembles the Cotteswold bed 
at Haresfield Hill, with Cephalopoda. In lke manner, each 
abounds with a Terebratula, which is its predominating fossil ; 
the Yorkshire shell is the Terebratula trilineata of Young and 
Bird, T. ovoides, Sow., a larger form than the subpunctata of 
Haresfield, but which very much resembles the latter shell when 
collected indiscriminately at each locality, and without prefer- 
ence to presumed typical forms: unfortunately, the Blue Wick 
specimens are more frequently compressed and distorted. Other 
_ fossils recognized are, Pleurotomaria subdecorata, D’Orb., which 
also occurs at Nailsworth ; Belemnites compressus, B. irregularis, 
and portions of Ammonites. Rhynchonella cynocephala has 
occurred very rarely, and several specimens of R. bidens are also 
recorded. The thick sandstones of the Dogger which overlie 
this zone abound with small quartzose pebbles, which are never 
seen beneath the ¢rilineata bed. 
In Gloucestershire, the lower zone at Brimscombe and Nails- 
worth has produced the Liassie Orbicula reflexa, Avicula in- 
equivalvis?, Lima Galathea, Ammonites Raquinianus, which 
is the crassus of Phillips, and another tumid form which much 
resembles it, and may be only a distinct variety. These have 
not been found to pass into the upper zone; but the oolitic ele- 
ment is fully represented in this lower zone by certain Conchi- 
fera, as Myoconcha crassa, Perna rugosa, Trigonia striata, Pho- 
ladomya fidicula, Modiola cuneata, Goniomya angulifera, Mytilus 
