334 Reports and Proceedings—Geological Society of London. 
character. The author considers that the process of injection was 
aided by the plasticity of the “granulitic” beds induced by the 
neighbourhood of igneous masses; also in the case of sub-marine 
ash-beds by the planes of sedimentation ; and in the case of intruded 
sheets of diorite, by the foliation parallel to the bedding, the intrusion 
of the granite being subsequent to that of the diorite. 
At Pen Voose a foliated granite, the author pointed out, occurs in 
association with a non-foliated gabbro and diorite, a fact indicating 
in his opinion that the foliation of the granite was produced before 
its perfect consolidation. The granite was the last to appear in the 
order of time, and had the foliation of the granite been produced by 
pressure after cooling, the gabbro and diorite would also have been 
foliated. 
2. “The Upper Jurassic Clays of Lincolnshire.” By Thomas 
Roberts, Esq., M.A., F.G.S. 
In Lincolnshire it has generally been considered that the Oxford 
and Kimeridge Clays come in direct sequence, and that the Corallian 
group of rocks is not represented. The author, however, endeavoured 
to show that there is between the Oxford and Kimeridge a zone of 
clay which is of Corallian age. 
Six paleontological zones were recognized in the Oxford Clay. 
The clays which come between the Oxford and Upper Kimeridge 
the author divided into the following zones :— 
(1) Black selenitiferous clays. (2) Dark clays crowded with 
Ostrea deltoidea. (3) Clays with Ammonites alternans; and (4) 
clays in which this fossil is absent. 
The black selenitiferous Clays (1) are regarded as Corallian, 
because (a) They come between the Oxford Clay and the basement 
bed of the Kimeridge. (b) Out of the 28 species of fossils collected 
from this zone 22 are Corallian. (c) Ostrea deltoidea and Gryphea 
dilatata occur together in these clays, and also in the Corallian, but 
in no other formation. 
The zones 2, 38, and 4 are of Lower Kimeridge Clay age. The 
lowest zone (2) is very persistent in character, and is met with in 
Yorkshire, Cambridgeshire, Oxfordshire, and the South of England. 
The remaining zones (8 and 4) are local in their development. 
3. “Origin of Movements in the Harth’s Crust.” By James R. 
Kilroe, Esq. Communicated by A. B. Wynne, Esq., F.G.S. 
The author is convinced that a very important factor has been 
omitted from the usual explanation offered in accounting for the 
vast movements which have obtained in the earth’s crust. His 
acknowledgments are due to Mr. Fisher for the extensive use 
made of his valuable work. He also refers frequently to the views 
and publications of other writers on terrestrial physics. From a 
somewhat conflicting mass of figures he concludes that about 20 
miles would remain to represent the amount of radial contraction 
due to cooling during the period from Archean to Recent times, 
corresponding to a circumferential contraction of 120 miles. This 
will have to be distributed over widely separate periods, at each of 
which there is abundant evidence of lateral compression. 
But be considers that this shrinkage alone will not account for 
