LOWER CHALK—SOUTH WILTSHIRE. 
149 
The layer of " cornstone ” concretions (No. 3) appears to be 
on the same horizon as the " Popple Bed ” of Mere, and I now regard 
it as the base of the Cenomanian stage, but there seems to have 
been some local current action whereby many fossils have been 
sifted out of the original bed and accumulated in a layer on the top 
of the “ cornstones; ” most of them, however, are well preserved, 
and not rolled, so that they have not been carried far from their 
original position. This layer, now the base of No. 4, may be des¬ 
cribed as a phosphatic conglomerate, and is about 3 inches thick ; it 
passes up into a fine brownish sand which is also about 3 inches 
and is likewise rich in fossils. The commonest fossils in this band 
are : — 
Ammonites [Hoplites] falcatus. 
„ [Acanth.] navicularis. 
„ [ ,, ] Mantelli. 
„ [Schloenb.] varians. 
[ „ ] Coupei. 
Turrilites Morrisi. 
„ Wiesti. 
Nautilus expansus. 
„ deslongchampsianus. 
Avellana cassis. 
Pleurotomaria (casts). 
There is no break between beds 4 and 5, the latter being almost 
a sand at its base. Passing up this becomes a very sandy marl of a 
greenish-grey colour, which contains larger grains both of quartz 
and glauconite, and this merges upward into Chloritic Marl of the 
usual character. Throughout the whole of this 2 feet broken 
fragments of dark brown phosphate are scattered, with a few 
phosphatic nodules and many casts of fossils ; but with these are 
many fossils with calcareous shells, which are clearly contemporaneous 
and not washed out of older beds. The following are some of the 
commoner species found in this bed:— 
Ichthyosaurus campylodon (tooth.) Plicatula inflata. 
Ostrea vesicularis. 
Thracia carinifera. q 31 
Rhynchonella grasiana 
Terebratella pectita. 
Terebratulina striata. 
Kingena lima. 
Galerites castanea. 
Pel tastes clathratus. 
Stauronema Carteri. 
At Rye Hill Barm, 3 miles E .N.E. of Maiden Bradley, there 
are two small sand pits, and in 1900 one of these was deepened 
by Mr. Scanes, in order to get a complete vertical section 
through the beds at the base of the Chalk. The succession wa* 
then found to be as follows :— 
l 2 
Ammonites [Schloenb.] varians. 
„ [ „ ] Coupei. 
Turrilites tuberculatus. 
Scapliites sequalis. 
Avellana cassis. 
Emarginula Gresslyi'? 
Inoceramus latus. 
Lima globosa 
,, aspera. 
Solarium bicarinatum. 
,, ornatum. 
Ostrea canaliculata. 
Cucullsea mailleana. 
Pecten asper. 
,, robinaldinus. 
Terebratula biplicata. 
Catopygus columbarius. 
Holaster Levis. 
Discoidea subuculus. 
Pseudodiadema Benettiae. 
4219. 
