A. R. Horwood—Upper Trias, Lewestershire. 411 
transported, not from the east, but from a much nearer root in the 
west, that is, from the Argentera gneiss and granite massif in 
the Maritime Alps, whence it ‘glided’ over the intervening Permo- 
Carboniferous formation of the Montgioie range to its present position 
probably in Mid-Permian times.!. The overlying Verrucano, Triassic 
limestones, and calc-schists with pietre verdi were, in that case, 
similarly transported from the Montgioie range at a later, probably 
in the Eocene period, the calc-schists being pushed beyond the 
Savona massif as a cover-sheet forming the present abnormally 
located Voltri group.” This alternative overthrust is indicated in the 
section Fig. 4. 
The interpretation as an overthrust is alluring, but of necessity 
hypothetical. It has been truly remarked that there is no difficulty, 
obstacle, or objection which the overthrust theory cannot overcome 
by geometrical designs.* Rovereto himself calls it geopoetismo.* 
When, therefore, a stratigraphical problem admits of a more tangible 
and legitimate in situ explanation, the presumption and balance 
should logically be in favour of the latter, and this may reasonably 
apply to a region geologically so singular and attractive as that of the 
contact-zone of Savona. 
1V.—Tuer Upper Trtas oF LEICESTERSHIRE. 
(Continued from the August Number, p. 371.) 
By A. R. Horwoop, F.L.S. 
(PLATE XVII.) 
7. PaLmonroLoey. 
7] \HIS district is of especial interest from the paleontological point of 
view in that the different members of the Upper Trias each afford 
a representative though not extensive flora and fauna. The scantiness 
of the material, in so far as the Lower Keuper and in some respects 
the Dane Hill Series are concerned, is due rather to the absence of 
good sections. ‘This cannot, however, be said of the Rhetic beds, 
for the section at Glen Parva is one of the finest in the Midlands. 
Lower Keuper Sandstones and Marls. 
Plant-remains.—In the higher part of the waterstones at Appleby, 
in the marls intercalated with sandstones, obscure plant-remains, 
possibly Equisetacez, occur. 
Annelid or Crustacean tracks.—At Kegworth the surfaces of the 
sandstones are covered here and there with obscure trails or tracks 
which may be organic. 
Footprints of Cheirotherium.—A footprint, discovered about 1879 
-by Mr. T. Large, was found at Kegworth in waterstones, which must 
1 The Permo-Carboniferous ‘ window’ would in that case be a syncline, and 
the adjacent crystalline mass west would be, not fan-shaped, but isoclinal. 
2 Termier and Boussac themselves assume the younger formations to have 
moved as cover-sheets from west to east, viz. in the opposite direction of the 
crystalline massif. 
* V. Novarese, ‘‘ Il Profilo della Grivola, Alpi Graje’’: Bull. R. Com. geol., 
1909, p. 497 et seq. 
+ Op. cit., p. 408. 
