150 
THE GEOLOGIST. 
After alluding to tlie single appearance of the Penia MuUeiii, confined to one 
group consisting of two beds or zones, and to the frequent appearances of the 
Grypha'tc that lirst occur with the Pcnia, and range upwards through more 
than four Inindrcd feet of strata, Mr. Norman alludes to the two groups of 
Crioceras-zones, and to special ranges of other species, some of limited occur- 
rence, some appearing at wide intervals, and some few of rather frequent 
occurrence throughout many strata. AH these particulars may be found in 
Dr. Pittou's table before alluded to. 
Mr. Norman also alludes to the re-oecurrenee of the wealden Lonchopteris 
Minilellii in the lower greensand, found by Dr. Eittou in seven bauds. At 
"VVliale Chine in particular (at a distance of about five hundred feet from the 
AthcrReld beds) nodules of ferrughious sandstone, containing Panoprca, Car- 
dium, Natica, Ammonites, &c., abound with the remains of this fern, associated 
with twigs and branches of trees, all carbonized. Sometimes the fragments 
and fronds are upwards of two inelies long. The nodules are also scattered 
along the shore as far as Walpen Chine, and a little beyond. Fragments of 
coniferous wood, and remains of large cycadaceous leaves occur also in these 
nodules. Mr. Wheeler, of Blackgang has found some good specimens ; but 
the best that Mr. Norman has seen wtit collected by M. Saemann, of Paris, in 
a block of red sand-rock, eastward of Blackgang Chine. The iguanodon has 
also been discovered, says Mr. Nonnan, somewhere in the same locality ; but 
not having been present when its discovery took place, I cannot state the 
exact spot. From the character, howTver, of the matrix adhering to the bones, 
I am confident as to their having been found in the upper portion of the lower 
greensand. The teeth and portions of its skidl, together with what remained 
of its skeleton, were forwarded to the British Museum. Some other tine 
specimens of iguanodou-boncs, from the same cliff, have been preserved at 
Newport, and others at Ryde. 
Mr. Norman further remarks that the occurrence of fossil wood, unperforated 
by teredo in the lower part of the lower greensand, together with fern-fronds, 
cycadaceous leaves, and tlie almost complete skeletons of igiumodons, has led 
him to think that these deposits were mainly derived from river-sediments not 
far from au old coast-line ; whilst the worm-bored drifted wood found lugher 
up in the series would seem to point to a more open sea for the place of the 
fornuition of the beds. 
Mr. Norman also reminds us of the re-occm-rence of the wealden Clatharia 
I/ijellil in the upper greensand, and of the condition under which Peden qiiin- 
qiircostalus occurs four times in the Perna-beds and the " Crackers ;" reappears 
higher up, in a diminutive state (associated with some species of Natica, Ros- 
teUaria, Trigonia, &c., that occurred in the " Crackers") in a hard grey gritty 
sandstone between Clitfend and Walpen Chine ; again occurs in the upper 
greensand (at about twenty feet above the gault), in a rather diminutive form, 
but much improved in appearance since last met with, more than tlu-ee hundred 
feet below. For the next fifty feet or so it occurs at intervals in the different 
beds, and it gradually increases in size until it reaches the chloritic marl, where 
(as well as in the beds of coarse chalcedony and sandstone immediately 
below) it attains its maximum size of about two to three inches long, 
and nearly as much in width. Here its extreme growth is attained. In 
the next bed, the " fossiUferous marl," it is again diminished, being no 
more than about half an inch long. It is still smaller i)i the lower chalk 
(grey chalk or chall< marl) ; and as the middle chalk of the locality con- 
tains no fossils, it is not met with until we come to the lowermost beds 
of the upper white chalk, where it is associated with Spondi/l/!s spinosm, 
and is in a much more improved condition than when last seen, in the lower 
ciialk. 
