300 Reviews—Geological Survey of Bavaria. 
Of more general interest, perhaps, are the new studies on the chain 
of St. Beaume, in Provence, by M. Marcel Bertrand. 
In a previous communication the author showed that the strata in 
Provence had been subject to great mechanical disturbance, for 
remnants of Triassic and Jurassic strata were found reposing on 
Upper Cretaceous rocks. He now gives additional examples of these 
“< phénoménes de recouvrement,” and draws attention to evidences of 
remarkable twisting in the overfolded strata and to sinuosities that 
were subsequently produced. 
Taking a section across the region from St. Zacharie to St. Beaume, 
he illustrates how the Jurassic, the Neocomian and Cretaceous strata 
are inverted on the north, being bent over in that area towards the 
south ; while further south the strata are plicated and faulted in 
places, but the faults are represented as dying out deep down in the 
folds to whose influence they are due. In the troughs of the 
synclinals are preserved remnants of Jurassic strata which rest on 
Upper Cretaceous beds. 
The explanation of these structures is given in an accompanying 
diagram. The Jurassic, Neocomian and Cretaceous strata that were 
laid down in sequence (interrupted by the local overlap of 
Neocomian by newer strata) were considerably denuded; great 
lateral compression followed, and this was attended by the remarkable 
overfolding of the strata in both the northern and southern portions 
of the region. The beds were sharply bent over and pushed 
forward, so that the uppermost strata in the overfolds were 
disrupted, and the overfolds became over-thrusts or thrust-planes— 
the disturbance in the north being the more pronounced. Further 
compression Jed to undulations in the mass of the strata, so that the 
comparatively undisturbed beds beneath and the superincumbent 
overthrust beds were together plicated. Subsequent denudation has 
left as it were only outlying patches of the older overthrust rocks, 
and these are portions that occupied the synclinal folds, having by 
reason of their structure withstood the agents of denudation. Thus 
the mechanical agents have left their imprint for the most part in 
relief, and the confused character of the topography finds an 
explanation. These great earth-movements, it should be added, took 
place before the Tertiary strata were deposited. 
The chief interest in this district is in the evidence afforded of the 
double folding, and in the overfolds on the north and on the south 
being inclined the one towards the other. Such a structure reminds 
the author of the celebrated section in the Alpes de Glaris by 
M. Heim. H. B. W. 
I].—Tue GronocicaL Survey or Bavaria. 
GxEoGNostiscuE JAHRESHEFTE. LErster Jahrgung 1888. Heraus- 
gegeben von der geognostischen Abtheilung des K. Bayer. 
Oberbergamtes in Miinchen. (Cassel, Fischer.) 
{fe this, the first year-book brought out by the Geological Survey 
of Bavaria, there are some important papers on the geology of 
that country. Amongst others, Dr. von Ammon gives a description 
