Reviews—Prof. Fouqué on Earthquakes. 521 
examination of the section at Speeton, and of the fossils therefrom 
_ in the Woodwardian and other museums of this country, with the 
result of discovering a very close resemblance in the fossils and 
petrographic character of these beds in the two countries, so that 
there can be no doubt that they should be considered as synchronic 
or homotaxial. The points of similarity and difference in the deposits 
and the fossils are discussed in considerable detail in the present 
paper, and the following are the conclusions arrived at by the author : 
(1) The beds with Perisphinctes virgatus of the Hast of Russia 
immediately overlie the strata with Hoplites eudoxus and Hxogyra 
virgula (Middle Kimmeridge), and are intimately related to these 
latter. (2) The Russian strata with Perisphinctes virgatus, correspond 
to the Upper Kimmeridge of English geologists (Blake), to the 
Lower Portlandian, and, in part, to the Middle Portlandian of the 
French geologists (Loriol). (8) The zone of Olcostephanus triplicatus, 
or the Lower Portland of Blake, exists in the Russian Jura, and serves 
as base to the beds with Oxynoticeras catenulatum (the first étage of 
Rouillier). (4) Judging by its stratigraphical relations, this first 
étage with O. catenulatum, cannot be more recent than the Upper 
Portland. (5) The bituminous schists of the Province of Simbirsk 
and those of Speeton are on the same geological horizon. (6) The 
zone of Belemnites lateralis, Phill. (corpulentus, Nik.), of Simbirsk, 
and the first étage of Rouillier, correspond to the zone at Speeton 
of this same fossil, and, consequently (7) the Bel. lateralis zone at 
Speeton corresponds to the Upper Portland of the South of England. 
(8) The gravels of Spilsby, Lincolnshire, are nearly equivalent to 
the Bel. lateralis zone of Speeton, and to the corresponding beds in 
Russia. (9) Between the zone of Bel. lateralis (corpulentus) and the 
Neocomian beds of Simbirsk there is a well-marked unconformity, 
which (10) nearly coincides with the epoch of Hoplites noricus and 
Bel. jaculum (type). (11) The zone at Speeton with Amm. speeton- 
ensis corresponds to the lower part of the Neocomian clays of 
Simbirsk (clays with Olcost. versicolor and Inoceramus aucella). 
(12) The fauna of the higher stages of the Russian Jura (first and 
second étages of Rouillier, Volgien inférieur et supérieur) is so 
intimately allied to that of the corresponding stages in England, 
that it is possible and desirable to adopt a common stratigraphical 
classification for the two countries. 
The author further shows in tabular form the corresponding zones 
in the two countries, and describes and figures some of the principal 
fossils, including new species of Olcostephanus from Swindon, and 
Spilsby, as well as from Simbirsk. 
IV.—Pror. F. Fovaué on Harraquakes. 
Les Tremptements pe Terre. By F. Fovqut, Membre de 
l'Institut (Académie des Sciences), Professeur au College de 
France. 828 pp. (Paris, J. B. Bailliére et Fils, 1888.) 
S the whole of Prof. Fouqué’s book will repay a careful study, 
this notice may be confined to one or two passages that seem 
to me to admit of improvement, and a few others as being worthy 
of especial attention from geologists. 
