SCIENTIFIC SUMMARY. 
319 
and building stone, and, according to the Geological Survey, belongs to the 
Forest Marble division of the Great Oolite series, and exhibits the structure 
known as “ false-bedding or oblique lamination; ” and occasionally the flag- 
stones in this and other neighbouring quarries show ripple-marks and tracks 
of marine animals. 
A portion of the upper surface has been removed, and the following is a 
general account of the section seen in the quarry in descending order : — 
Bubbly limestone, about four feet ; brown shaley clay, with thin calcareous 
shaley bands, slightly oolitic, full of oysters, O. Sowerbyi, of different sizes, 
more or less broken, and other fossils. At the level of this bed in one part 
of the quarry were the nodules, round or lenticular in shape, of a fine, com- 
pact, highly calcareous and ferruginous claystone, or indurated marl, of 
light brown colour, both the under, lateral, and upper surfaces of which 
have been perforated by some boring mollusc, as Lithodomus or Gastrochcena ; 
the holes are pear-shaped, and are found all round the margin of the 
nodules, and are filled either with a yellowish-brown mud with some oolite 
grains, due to subsequent infiltration, or with crystallised calcite ; in some 
cases the shells of the mollusc have been preserved. Besides the perfora- 
tions, the surfaces of many of the nodules are covered with attached valves 
of oysters and a carinated Serpula , the interspaces, as well as the valves of 
the oysters, being incrusted with a delicate species belonging to the Polyzoa, 
probably a JBerenicea or Diastopora ; the thickness of this bed is about three 
feet. The nodules are coated with similar species of Polyzoa and of Serpula 
to those which incrust the separate plates and joints of the Apiocrinus 
rotundas , which occur in the Bradford-clay at Bradford, Wiltshire. Coarse 
shelly limestones, more or less irregular and false-bedded, with partings of 
clay full of fossils ; among the most common are Terebratula digona, Lima 
cardiiformis, Pecten vagans, Modiola imbricata, Ostrea Marshii ', O. Soiverbyi, 
Trigonia, Corbida , Nucula, Area , Serpula , spines and plates of Echini 
( Acrosalenia and Cidaris), Corals ( Cladophyllia Babeana ), Phynchonella 
media, Cerithium, Cylindrites, Nucula , and fragments of wood. 
Sir Charles Ly ell’s Gift to the Geological Society. — At the meeting of the 
Geological Society on March 24 (just when our last number was “ at press”), 
the President announced that the late Sir Charles Lyell had bequeathed to 
the Society the sum of 2,000 1. for the purposes stated in the following ex- 
tract from his will : — “ I give to the Geological Society of London the die 
executed by Mr. Leonard Wyon of a medal to be cast in bronze and to be 
given annually and called the Lyell Medal, and to be regarded as a mark of 
honorary distinction and as an expression on the part of the governing body 
of the society that the medallist (who may be of any country or either sex) 
has deserved well of the science. I further give to the said society the sum 
of two thousand pounds (free of legacy duty) to be paid to the president and 
treasurer for the time being, whose receipt shall be a good discharge to my 
executors ; and I direct the said sum to be invested in the name of the said 
society, or of the trustees thereof, in such securities as the council shall from 
time to time think proper, and that the annual interest arising therefrom 
shall be appropriated and applied in the following manner : not less than one- 
third of the annual interest to accompany the medal, the remaining interest 
to be given in one or more portions, at the discretion of the council, for the 
