376 Reports and Proceedings—Geological Society of London. 
Doulting Beds. The Doulting Beds are equivalent to the Olypeus 
Grit of the district here dealt with; the Rubbly Beds to the Rubbly 
Beds, and the Anabacia Limestones, plus the Doulting Stone, to the 
‘Massive Beds’ of the Clypeus Grit. The basal portion of the Fullers’ 
Earth in the neighbourhood of Midford is of z¢gzag hemera. ‘There is 
no reason for assigning the thin clay-bed, with its median band of 
Ostrea acuminata Limestone at Great Rissington, to any other hemera. 
Whatever is the case elsewhere, there is no deposit in the Rissington 
district between the Clypeus Grit and the Fullers’ Earth. 
3. ‘The Flora of the Inferior Oolite of Brora (Sutherland).” By 
Miss M. C. Stopes, D.Se., Ph.D., Lecturer in the Victoria University 
of Manchester. (Communicated by Professor J. W. Judd, C.B., 
da) BAS ry dele Erat ss) 
This paper is to place on record the discovery of a bed containing 
impressions of plants, which represent a flora bearing a strong likeness 
to that of the Inferior Oolite of the Yorkshire coast. Previously, but 
one species and a second doubtful one were known from these coal- 
bearing beds. The bed in which the plants were found was a thin 
shale-band cropping out below high-tide level on the coast, about 
14 miles south of Brora. According to Professor Judd’s mapping, 
this reef would come within the boundary of the Lower Oolite, 
although from the more recent Geological Survey map it appears to 
come in the position of the Middle Oolite. It forms a band 2 or 3 inches 
thick im a barren grey shale, and the impressions are fragmentary 
except in the case of Gankgo, some of the leaves of which are practically 
perfect and show the veining of the lamina, and in some cases (after 
suitable treatment) the minute detail of the epidermis. Seven species 
of plants are identified, one of them being new, and four other species 
admitting of generic identification; and most of these species are 
identical with those obtained from the Inferior Oolite of Yorkshire. 
The minute structure of the leaves of Ginkgo is compared with those 
of G. biloba, and proves the species to be quite distinct. The plants 
found are those of a land-area, probably with firm ground surrounding 
pools or shallow water, as indicated by the fact that Ginkgo and 
Liquisetites are the two commonest forms. 
4, ‘“‘The Constitution of the Interior of the Earth as revealed by 
Earthquakes (second communication): Some New Light on the Origin 
of the Oceans.”” By Richard Dixon Oldham, F.G.S. 
The attempts which have been made to account for the oceans and 
continents are all subject to an uncertainty, in that we have had no 
means of knowing whether it is a mere irregularity of form that has 
to be accounted for, or whether this irregularity is but the expression 
of a deep-seated difference in the constitution of the earth. The paper 
is an attempt to clear up this uncertainty by a comparison of the 
Kuropean records of the San Francisco and Colombian earthquakes of 
April 18th and January 31st, 1906. In the former case the wave- 
paths to Kurope lay under the continent of North America and the 
continental shelf of the North Atlantic, being typically continental in 
character; in the latter case they crossed the broadest and deepest 
part of the Atlantic basin, being essentially oceanic. The absolute 
