80 REPORT—1868. 
the surface by a trap-dyke, which trends from N.N.W. to S.S.E., displacing the 
strata about 90 fathoms. 
On some New Fossils from the Longmynd Rocks of Sweden. 
By Prof. Orro Torrett. 
The author exhibited a series of slabs marked by the impressions of various land- 
plants known to geologists by the name of chondrites. He had these fossil plants 
from a formation much older than any from which fossils have hitherto been ob- 
tained. The rocks from which they were derived were of an age similar to those 
of the Longmynd rocks in Wales. The under sides of many of the slabs were pitted 
with the markings of rain-drops ; and the conclusion which the author came to was, 
that the character of the plants and the meteorological markings upon them indi- 
cated that they had been deposited under shallow-water conditions. This he cor- 
roborated by showing that a bed of shingle or conglomerate was associated with 
them, which he judged to have been part of an old sea-beach. The same slabs 
were marked by the trails of marine worms that had crawled over them. The casts 
of some of these worms were distinctly to be seen on the surface of theslabs. The 
slabs were handed round, and scrutinized most minutely by many geologists present. 
On the Glacial and Postglacial Structure of Norfolk and Suffolk. 
By Srarzes V. Woop, Jun., and F. W. Harmer. 
This paper was a summary of the results arrived at by the authors from a survey 
and mapping of the Crag and Glacial beds of Norfolk and Suffolk, upon the 
Ordnance (one inch to the mile) map, which they have been carrying on during 
the last four years. The paper was illustrated with a large map, constructed from 
their survey map, and copious detailed sections, traversing the counties in various 
directions, without which the paper itself is difficult to be understood. The prin- 
cipal results at which the authors have arrived at are as follows :— 
That the Fluviomarine Crag of Thorpe and Bramerton, and of Wangford, 
Bulchamp, and Thorpe, near Aldborough, is coeval with the newer part of the Red 
Crag. 
That the Crag of Burgh, Horstead, and Coltishall, in the Bure Valley, is a fluvio- 
marine development of the Chillesford shell-bed, or Crag of Easton and Aldeby, 
which, divided from the Red and Fluyiomarine Crag by an interval of sand of vary- 
ing thickness, overlies the Red Crag at Chillesford, and the Fluviomarine Crag 
(or old Norwich Crag) at Thorpe and Bramerton. ? 
That the so-called Crag of Belaugh, in the Bure Valley, and the so-called Crag 
of the Weybourne and Cromer coast, are newer than the Chillesford beds (which, 
unless the pebble-beds next mentioned be a still higher part of the Crag series, 
form the uppermost of the true Crag series), being characterized by the presence in 
profusion of a shell unknown to any bed of the true Crag series from the Chilles- 
ford clay downwards, viz. the Vellina solidula; and were introduced after an 
elevation of the Crag area had converted the southern portion of it into land, and 
given rise over the. northern portion to extensive sands with pebble-beds, 
which rest on and indent the Chillesford clay in that northern portion. These 
sands with pebbles occupy in the south of Norfolk and north of Suffolk the same 
es relatively to the Contorted Drift as is occupied on the Cromer coast by the 
Veybourne sand (or so-called “ Crag” of the Cromer coast), the Cromer Till, and 
the indenting sand (or bed ¢ after-mentioned). These pebble-beds may thus 
represent in time either the whole or any one of the formations a, nb, and c (de- 
scribed further on); or they may form merely the closing bed of the true Crag 
series*, in which case the Weybourne sand, the Cromer Till, and bed c are en- 
tirely unrepresented in the south of Norfolk and north of Suffolk. 
That the forest beds of the coast, extending from Eccles to Weybourne, with 
their associated sandy clays of freshwater origin (being the oldest’ beds exposed 
along that coast, and haying been partially destroyed by the denudation of the sea 
* The authors are inclined to think that the second of these alternatives is the true one ; 
and they hope to clear up the point by means of a fossiliferous pebble-bed near Bungay. 
